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linux-next/drivers/gpu/drm/bridge/ti-sn65dsi86.c
Alexander A. Klimov ce1995a7e3 drm/bridge: Replace HTTP links with HTTPS ones 
Rationale:
Reduces attack surface on kernel devs opening the links for MITM
as HTTPS traffic is much harder to manipulate.

Deterministic algorithm:
For each file:
  If not .svg:
    For each line:
      If doesn't contain `\bxmlns\b`:
        For each link, `\bhttp://[^# \t\r\n]*(?:\w|/)`:
	  If neither `\bgnu\.org/license`, nor `\bmozilla\.org/MPL\b`:
            If both the HTTP and HTTPS versions
            return 200 OK and serve the same content:
              Replace HTTP with HTTPS.

Signed-off-by: Alexander A. Klimov <grandmaster@al2klimov.de>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200708121604.14292-1-grandmaster@al2klimov.de
2020-07-10 20:21:45 +02:00

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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2018, The Linux Foundation. All rights reserved.
* datasheet: https://www.ti.com/lit/ds/symlink/sn65dsi86.pdf
*/
#include <linux/bits.h>
#include <linux/clk.h>
#include <linux/debugfs.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio/driver.h>
#include <linux/i2c.h>
#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/of_graph.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_dp_helper.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_of.h>
#include <drm/drm_panel.h>
#include <drm/drm_print.h>
#include <drm/drm_probe_helper.h>
#define SN_DEVICE_REV_REG 0x08
#define SN_DPPLL_SRC_REG 0x0A
#define DPPLL_CLK_SRC_DSICLK BIT(0)
#define REFCLK_FREQ_MASK GENMASK(3, 1)
#define REFCLK_FREQ(x) ((x) << 1)
#define DPPLL_SRC_DP_PLL_LOCK BIT(7)
#define SN_PLL_ENABLE_REG 0x0D
#define SN_DSI_LANES_REG 0x10
#define CHA_DSI_LANES_MASK GENMASK(4, 3)
#define CHA_DSI_LANES(x) ((x) << 3)
#define SN_DSIA_CLK_FREQ_REG 0x12
#define SN_CHA_ACTIVE_LINE_LENGTH_LOW_REG 0x20
#define SN_CHA_VERTICAL_DISPLAY_SIZE_LOW_REG 0x24
#define SN_CHA_HSYNC_PULSE_WIDTH_LOW_REG 0x2C
#define SN_CHA_HSYNC_PULSE_WIDTH_HIGH_REG 0x2D
#define CHA_HSYNC_POLARITY BIT(7)
#define SN_CHA_VSYNC_PULSE_WIDTH_LOW_REG 0x30
#define SN_CHA_VSYNC_PULSE_WIDTH_HIGH_REG 0x31
#define CHA_VSYNC_POLARITY BIT(7)
#define SN_CHA_HORIZONTAL_BACK_PORCH_REG 0x34
#define SN_CHA_VERTICAL_BACK_PORCH_REG 0x36
#define SN_CHA_HORIZONTAL_FRONT_PORCH_REG 0x38
#define SN_CHA_VERTICAL_FRONT_PORCH_REG 0x3A
#define SN_LN_ASSIGN_REG 0x59
#define LN_ASSIGN_WIDTH 2
#define SN_ENH_FRAME_REG 0x5A
#define VSTREAM_ENABLE BIT(3)
#define LN_POLRS_OFFSET 4
#define LN_POLRS_MASK 0xf0
#define SN_DATA_FORMAT_REG 0x5B
#define BPP_18_RGB BIT(0)
#define SN_HPD_DISABLE_REG 0x5C
#define HPD_DISABLE BIT(0)
#define SN_GPIO_IO_REG 0x5E
#define SN_GPIO_INPUT_SHIFT 4
#define SN_GPIO_OUTPUT_SHIFT 0
#define SN_GPIO_CTRL_REG 0x5F
#define SN_GPIO_MUX_INPUT 0
#define SN_GPIO_MUX_OUTPUT 1
#define SN_GPIO_MUX_SPECIAL 2
#define SN_GPIO_MUX_MASK 0x3
#define SN_AUX_WDATA_REG(x) (0x64 + (x))
#define SN_AUX_ADDR_19_16_REG 0x74
#define SN_AUX_ADDR_15_8_REG 0x75
#define SN_AUX_ADDR_7_0_REG 0x76
#define SN_AUX_LENGTH_REG 0x77
#define SN_AUX_CMD_REG 0x78
#define AUX_CMD_SEND BIT(0)
#define AUX_CMD_REQ(x) ((x) << 4)
#define SN_AUX_RDATA_REG(x) (0x79 + (x))
#define SN_SSC_CONFIG_REG 0x93
#define DP_NUM_LANES_MASK GENMASK(5, 4)
#define DP_NUM_LANES(x) ((x) << 4)
#define SN_DATARATE_CONFIG_REG 0x94
#define DP_DATARATE_MASK GENMASK(7, 5)
#define DP_DATARATE(x) ((x) << 5)
#define SN_ML_TX_MODE_REG 0x96
#define ML_TX_MAIN_LINK_OFF 0
#define ML_TX_NORMAL_MODE BIT(0)
#define SN_AUX_CMD_STATUS_REG 0xF4
#define AUX_IRQ_STATUS_AUX_RPLY_TOUT BIT(3)
#define AUX_IRQ_STATUS_AUX_SHORT BIT(5)
#define AUX_IRQ_STATUS_NAT_I2C_FAIL BIT(6)
#define MIN_DSI_CLK_FREQ_MHZ 40
/* fudge factor required to account for 8b/10b encoding */
#define DP_CLK_FUDGE_NUM 10
#define DP_CLK_FUDGE_DEN 8
/* Matches DP_AUX_MAX_PAYLOAD_BYTES (for now) */
#define SN_AUX_MAX_PAYLOAD_BYTES 16
#define SN_REGULATOR_SUPPLY_NUM 4
#define SN_MAX_DP_LANES 4
#define SN_NUM_GPIOS 4
#define SN_GPIO_PHYSICAL_OFFSET 1
/**
* struct ti_sn_bridge - Platform data for ti-sn65dsi86 driver.
* @dev: Pointer to our device.
* @regmap: Regmap for accessing i2c.
* @aux: Our aux channel.
* @bridge: Our bridge.
* @connector: Our connector.
* @debugfs: Used for managing our debugfs.
* @host_node: Remote DSI node.
* @dsi: Our MIPI DSI source.
* @refclk: Our reference clock.
* @panel: Our panel.
* @enable_gpio: The GPIO we toggle to enable the bridge.
* @supplies: Data for bulk enabling/disabling our regulators.
* @dp_lanes: Count of dp_lanes we're using.
* @ln_assign: Value to program to the LN_ASSIGN register.
* @ln_polrs: Value for the 4-bit LN_POLRS field of SN_ENH_FRAME_REG.
*
* @gchip: If we expose our GPIOs, this is used.
* @gchip_output: A cache of whether we've set GPIOs to output. This
* serves double-duty of keeping track of the direction and
* also keeping track of whether we've incremented the
* pm_runtime reference count for this pin, which we do
* whenever a pin is configured as an output. This is a
* bitmap so we can do atomic ops on it without an extra
* lock so concurrent users of our 4 GPIOs don't stomp on
* each other's read-modify-write.
*/
struct ti_sn_bridge {
struct device *dev;
struct regmap *regmap;
struct drm_dp_aux aux;
struct drm_bridge bridge;
struct drm_connector connector;
struct dentry *debugfs;
struct device_node *host_node;
struct mipi_dsi_device *dsi;
struct clk *refclk;
struct drm_panel *panel;
struct gpio_desc *enable_gpio;
struct regulator_bulk_data supplies[SN_REGULATOR_SUPPLY_NUM];
int dp_lanes;
u8 ln_assign;
u8 ln_polrs;
#if defined(CONFIG_OF_GPIO)
struct gpio_chip gchip;
DECLARE_BITMAP(gchip_output, SN_NUM_GPIOS);
#endif
};
static const struct regmap_range ti_sn_bridge_volatile_ranges[] = {
{ .range_min = 0, .range_max = 0xFF },
};
static const struct regmap_access_table ti_sn_bridge_volatile_table = {
.yes_ranges = ti_sn_bridge_volatile_ranges,
.n_yes_ranges = ARRAY_SIZE(ti_sn_bridge_volatile_ranges),
};
static const struct regmap_config ti_sn_bridge_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.volatile_table = &ti_sn_bridge_volatile_table,
.cache_type = REGCACHE_NONE,
};
static void ti_sn_bridge_write_u16(struct ti_sn_bridge *pdata,
unsigned int reg, u16 val)
{
regmap_write(pdata->regmap, reg, val & 0xFF);
regmap_write(pdata->regmap, reg + 1, val >> 8);
}
static int __maybe_unused ti_sn_bridge_resume(struct device *dev)
{
struct ti_sn_bridge *pdata = dev_get_drvdata(dev);
int ret;
ret = regulator_bulk_enable(SN_REGULATOR_SUPPLY_NUM, pdata->supplies);
if (ret) {
DRM_ERROR("failed to enable supplies %d\n", ret);
return ret;
}
gpiod_set_value(pdata->enable_gpio, 1);
return ret;
}
static int __maybe_unused ti_sn_bridge_suspend(struct device *dev)
{
struct ti_sn_bridge *pdata = dev_get_drvdata(dev);
int ret;
gpiod_set_value(pdata->enable_gpio, 0);
ret = regulator_bulk_disable(SN_REGULATOR_SUPPLY_NUM, pdata->supplies);
if (ret)
DRM_ERROR("failed to disable supplies %d\n", ret);
return ret;
}
static const struct dev_pm_ops ti_sn_bridge_pm_ops = {
SET_RUNTIME_PM_OPS(ti_sn_bridge_suspend, ti_sn_bridge_resume, NULL)
SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
pm_runtime_force_resume)
};
static int status_show(struct seq_file *s, void *data)
{
struct ti_sn_bridge *pdata = s->private;
unsigned int reg, val;
seq_puts(s, "STATUS REGISTERS:\n");
pm_runtime_get_sync(pdata->dev);
/* IRQ Status Registers, see Table 31 in datasheet */
for (reg = 0xf0; reg <= 0xf8; reg++) {
regmap_read(pdata->regmap, reg, &val);
seq_printf(s, "[0x%02x] = 0x%08x\n", reg, val);
}
pm_runtime_put(pdata->dev);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(status);
static void ti_sn_debugfs_init(struct ti_sn_bridge *pdata)
{
pdata->debugfs = debugfs_create_dir(dev_name(pdata->dev), NULL);
debugfs_create_file("status", 0600, pdata->debugfs, pdata,
&status_fops);
}
static void ti_sn_debugfs_remove(struct ti_sn_bridge *pdata)
{
debugfs_remove_recursive(pdata->debugfs);
pdata->debugfs = NULL;
}
/* Connector funcs */
static struct ti_sn_bridge *
connector_to_ti_sn_bridge(struct drm_connector *connector)
{
return container_of(connector, struct ti_sn_bridge, connector);
}
static int ti_sn_bridge_connector_get_modes(struct drm_connector *connector)
{
struct ti_sn_bridge *pdata = connector_to_ti_sn_bridge(connector);
return drm_panel_get_modes(pdata->panel, connector);
}
static enum drm_mode_status
ti_sn_bridge_connector_mode_valid(struct drm_connector *connector,
struct drm_display_mode *mode)
{
/* maximum supported resolution is 4K at 60 fps */
if (mode->clock > 594000)
return MODE_CLOCK_HIGH;
return MODE_OK;
}
static struct drm_connector_helper_funcs ti_sn_bridge_connector_helper_funcs = {
.get_modes = ti_sn_bridge_connector_get_modes,
.mode_valid = ti_sn_bridge_connector_mode_valid,
};
static enum drm_connector_status
ti_sn_bridge_connector_detect(struct drm_connector *connector, bool force)
{
/**
* TODO: Currently if drm_panel is present, then always
* return the status as connected. Need to add support to detect
* device state for hot pluggable scenarios.
*/
return connector_status_connected;
}
static const struct drm_connector_funcs ti_sn_bridge_connector_funcs = {
.fill_modes = drm_helper_probe_single_connector_modes,
.detect = ti_sn_bridge_connector_detect,
.destroy = drm_connector_cleanup,
.reset = drm_atomic_helper_connector_reset,
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};
static struct ti_sn_bridge *bridge_to_ti_sn_bridge(struct drm_bridge *bridge)
{
return container_of(bridge, struct ti_sn_bridge, bridge);
}
static int ti_sn_bridge_parse_regulators(struct ti_sn_bridge *pdata)
{
unsigned int i;
const char * const ti_sn_bridge_supply_names[] = {
"vcca", "vcc", "vccio", "vpll",
};
for (i = 0; i < SN_REGULATOR_SUPPLY_NUM; i++)
pdata->supplies[i].supply = ti_sn_bridge_supply_names[i];
return devm_regulator_bulk_get(pdata->dev, SN_REGULATOR_SUPPLY_NUM,
pdata->supplies);
}
static int ti_sn_bridge_attach(struct drm_bridge *bridge,
enum drm_bridge_attach_flags flags)
{
int ret, val;
struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge);
struct mipi_dsi_host *host;
struct mipi_dsi_device *dsi;
const struct mipi_dsi_device_info info = { .type = "ti_sn_bridge",
.channel = 0,
.node = NULL,
};
if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
DRM_ERROR("Fix bridge driver to make connector optional!");
return -EINVAL;
}
ret = drm_connector_init(bridge->dev, &pdata->connector,
&ti_sn_bridge_connector_funcs,
DRM_MODE_CONNECTOR_eDP);
if (ret) {
DRM_ERROR("Failed to initialize connector with drm\n");
return ret;
}
drm_connector_helper_add(&pdata->connector,
&ti_sn_bridge_connector_helper_funcs);
drm_connector_attach_encoder(&pdata->connector, bridge->encoder);
/*
* TODO: ideally finding host resource and dsi dev registration needs
* to be done in bridge probe. But some existing DSI host drivers will
* wait for any of the drm_bridge/drm_panel to get added to the global
* bridge/panel list, before completing their probe. So if we do the
* dsi dev registration part in bridge probe, before populating in
* the global bridge list, then it will cause deadlock as dsi host probe
* will never complete, neither our bridge probe. So keeping it here
* will satisfy most of the existing host drivers. Once the host driver
* is fixed we can move the below code to bridge probe safely.
*/
host = of_find_mipi_dsi_host_by_node(pdata->host_node);
if (!host) {
DRM_ERROR("failed to find dsi host\n");
ret = -ENODEV;
goto err_dsi_host;
}
dsi = mipi_dsi_device_register_full(host, &info);
if (IS_ERR(dsi)) {
DRM_ERROR("failed to create dsi device\n");
ret = PTR_ERR(dsi);
goto err_dsi_host;
}
/* TODO: setting to 4 MIPI lanes always for now */
dsi->lanes = 4;
dsi->format = MIPI_DSI_FMT_RGB888;
dsi->mode_flags = MIPI_DSI_MODE_VIDEO;
/* check if continuous dsi clock is required or not */
pm_runtime_get_sync(pdata->dev);
regmap_read(pdata->regmap, SN_DPPLL_SRC_REG, &val);
pm_runtime_put(pdata->dev);
if (!(val & DPPLL_CLK_SRC_DSICLK))
dsi->mode_flags |= MIPI_DSI_CLOCK_NON_CONTINUOUS;
ret = mipi_dsi_attach(dsi);
if (ret < 0) {
DRM_ERROR("failed to attach dsi to host\n");
goto err_dsi_attach;
}
pdata->dsi = dsi;
/* attach panel to bridge */
drm_panel_attach(pdata->panel, &pdata->connector);
return 0;
err_dsi_attach:
mipi_dsi_device_unregister(dsi);
err_dsi_host:
drm_connector_cleanup(&pdata->connector);
return ret;
}
static void ti_sn_bridge_disable(struct drm_bridge *bridge)
{
struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge);
drm_panel_disable(pdata->panel);
/* disable video stream */
regmap_update_bits(pdata->regmap, SN_ENH_FRAME_REG, VSTREAM_ENABLE, 0);
/* semi auto link training mode OFF */
regmap_write(pdata->regmap, SN_ML_TX_MODE_REG, 0);
/* disable DP PLL */
regmap_write(pdata->regmap, SN_PLL_ENABLE_REG, 0);
drm_panel_unprepare(pdata->panel);
}
static u32 ti_sn_bridge_get_dsi_freq(struct ti_sn_bridge *pdata)
{
u32 bit_rate_khz, clk_freq_khz;
struct drm_display_mode *mode =
&pdata->bridge.encoder->crtc->state->adjusted_mode;
bit_rate_khz = mode->clock *
mipi_dsi_pixel_format_to_bpp(pdata->dsi->format);
clk_freq_khz = bit_rate_khz / (pdata->dsi->lanes * 2);
return clk_freq_khz;
}
/* clk frequencies supported by bridge in Hz in case derived from REFCLK pin */
static const u32 ti_sn_bridge_refclk_lut[] = {
12000000,
19200000,
26000000,
27000000,
38400000,
};
/* clk frequencies supported by bridge in Hz in case derived from DACP/N pin */
static const u32 ti_sn_bridge_dsiclk_lut[] = {
468000000,
384000000,
416000000,
486000000,
460800000,
};
static void ti_sn_bridge_set_refclk_freq(struct ti_sn_bridge *pdata)
{
int i;
u32 refclk_rate;
const u32 *refclk_lut;
size_t refclk_lut_size;
if (pdata->refclk) {
refclk_rate = clk_get_rate(pdata->refclk);
refclk_lut = ti_sn_bridge_refclk_lut;
refclk_lut_size = ARRAY_SIZE(ti_sn_bridge_refclk_lut);
clk_prepare_enable(pdata->refclk);
} else {
refclk_rate = ti_sn_bridge_get_dsi_freq(pdata) * 1000;
refclk_lut = ti_sn_bridge_dsiclk_lut;
refclk_lut_size = ARRAY_SIZE(ti_sn_bridge_dsiclk_lut);
}
/* for i equals to refclk_lut_size means default frequency */
for (i = 0; i < refclk_lut_size; i++)
if (refclk_lut[i] == refclk_rate)
break;
regmap_update_bits(pdata->regmap, SN_DPPLL_SRC_REG, REFCLK_FREQ_MASK,
REFCLK_FREQ(i));
}
static void ti_sn_bridge_set_dsi_rate(struct ti_sn_bridge *pdata)
{
unsigned int bit_rate_mhz, clk_freq_mhz;
unsigned int val;
struct drm_display_mode *mode =
&pdata->bridge.encoder->crtc->state->adjusted_mode;
/* set DSIA clk frequency */
bit_rate_mhz = (mode->clock / 1000) *
mipi_dsi_pixel_format_to_bpp(pdata->dsi->format);
clk_freq_mhz = bit_rate_mhz / (pdata->dsi->lanes * 2);
/* for each increment in val, frequency increases by 5MHz */
val = (MIN_DSI_CLK_FREQ_MHZ / 5) +
(((clk_freq_mhz - MIN_DSI_CLK_FREQ_MHZ) / 5) & 0xFF);
regmap_write(pdata->regmap, SN_DSIA_CLK_FREQ_REG, val);
}
static unsigned int ti_sn_bridge_get_bpp(struct ti_sn_bridge *pdata)
{
if (pdata->connector.display_info.bpc <= 6)
return 18;
else
return 24;
}
/*
* LUT index corresponds to register value and
* LUT values corresponds to dp data rate supported
* by the bridge in Mbps unit.
*/
static const unsigned int ti_sn_bridge_dp_rate_lut[] = {
0, 1620, 2160, 2430, 2700, 3240, 4320, 5400
};
static int ti_sn_bridge_calc_min_dp_rate_idx(struct ti_sn_bridge *pdata)
{
unsigned int bit_rate_khz, dp_rate_mhz;
unsigned int i;
struct drm_display_mode *mode =
&pdata->bridge.encoder->crtc->state->adjusted_mode;
/* Calculate minimum bit rate based on our pixel clock. */
bit_rate_khz = mode->clock * ti_sn_bridge_get_bpp(pdata);
/* Calculate minimum DP data rate, taking 80% as per DP spec */
dp_rate_mhz = DIV_ROUND_UP(bit_rate_khz * DP_CLK_FUDGE_NUM,
1000 * pdata->dp_lanes * DP_CLK_FUDGE_DEN);
for (i = 1; i < ARRAY_SIZE(ti_sn_bridge_dp_rate_lut) - 1; i++)
if (ti_sn_bridge_dp_rate_lut[i] >= dp_rate_mhz)
break;
return i;
}
static void ti_sn_bridge_read_valid_rates(struct ti_sn_bridge *pdata,
bool rate_valid[])
{
unsigned int rate_per_200khz;
unsigned int rate_mhz;
u8 dpcd_val;
int ret;
int i, j;
ret = drm_dp_dpcd_readb(&pdata->aux, DP_EDP_DPCD_REV, &dpcd_val);
if (ret != 1) {
DRM_DEV_ERROR(pdata->dev,
"Can't read eDP rev (%d), assuming 1.1\n", ret);
dpcd_val = DP_EDP_11;
}
if (dpcd_val >= DP_EDP_14) {
/* eDP 1.4 devices must provide a custom table */
__le16 sink_rates[DP_MAX_SUPPORTED_RATES];
ret = drm_dp_dpcd_read(&pdata->aux, DP_SUPPORTED_LINK_RATES,
sink_rates, sizeof(sink_rates));
if (ret != sizeof(sink_rates)) {
DRM_DEV_ERROR(pdata->dev,
"Can't read supported rate table (%d)\n", ret);
/* By zeroing we'll fall back to DP_MAX_LINK_RATE. */
memset(sink_rates, 0, sizeof(sink_rates));
}
for (i = 0; i < ARRAY_SIZE(sink_rates); i++) {
rate_per_200khz = le16_to_cpu(sink_rates[i]);
if (!rate_per_200khz)
break;
rate_mhz = rate_per_200khz * 200 / 1000;
for (j = 0;
j < ARRAY_SIZE(ti_sn_bridge_dp_rate_lut);
j++) {
if (ti_sn_bridge_dp_rate_lut[j] == rate_mhz)
rate_valid[j] = true;
}
}
for (i = 0; i < ARRAY_SIZE(ti_sn_bridge_dp_rate_lut); i++) {
if (rate_valid[i])
return;
}
DRM_DEV_ERROR(pdata->dev,
"No matching eDP rates in table; falling back\n");
}
/* On older versions best we can do is use DP_MAX_LINK_RATE */
ret = drm_dp_dpcd_readb(&pdata->aux, DP_MAX_LINK_RATE, &dpcd_val);
if (ret != 1) {
DRM_DEV_ERROR(pdata->dev,
"Can't read max rate (%d); assuming 5.4 GHz\n",
ret);
dpcd_val = DP_LINK_BW_5_4;
}
switch (dpcd_val) {
default:
DRM_DEV_ERROR(pdata->dev,
"Unexpected max rate (%#x); assuming 5.4 GHz\n",
(int)dpcd_val);
/* fall through */
case DP_LINK_BW_5_4:
rate_valid[7] = 1;
/* fall through */
case DP_LINK_BW_2_7:
rate_valid[4] = 1;
/* fall through */
case DP_LINK_BW_1_62:
rate_valid[1] = 1;
break;
}
}
static void ti_sn_bridge_set_video_timings(struct ti_sn_bridge *pdata)
{
struct drm_display_mode *mode =
&pdata->bridge.encoder->crtc->state->adjusted_mode;
u8 hsync_polarity = 0, vsync_polarity = 0;
if (mode->flags & DRM_MODE_FLAG_PHSYNC)
hsync_polarity = CHA_HSYNC_POLARITY;
if (mode->flags & DRM_MODE_FLAG_PVSYNC)
vsync_polarity = CHA_VSYNC_POLARITY;
ti_sn_bridge_write_u16(pdata, SN_CHA_ACTIVE_LINE_LENGTH_LOW_REG,
mode->hdisplay);
ti_sn_bridge_write_u16(pdata, SN_CHA_VERTICAL_DISPLAY_SIZE_LOW_REG,
mode->vdisplay);
regmap_write(pdata->regmap, SN_CHA_HSYNC_PULSE_WIDTH_LOW_REG,
(mode->hsync_end - mode->hsync_start) & 0xFF);
regmap_write(pdata->regmap, SN_CHA_HSYNC_PULSE_WIDTH_HIGH_REG,
(((mode->hsync_end - mode->hsync_start) >> 8) & 0x7F) |
hsync_polarity);
regmap_write(pdata->regmap, SN_CHA_VSYNC_PULSE_WIDTH_LOW_REG,
(mode->vsync_end - mode->vsync_start) & 0xFF);
regmap_write(pdata->regmap, SN_CHA_VSYNC_PULSE_WIDTH_HIGH_REG,
(((mode->vsync_end - mode->vsync_start) >> 8) & 0x7F) |
vsync_polarity);
regmap_write(pdata->regmap, SN_CHA_HORIZONTAL_BACK_PORCH_REG,
(mode->htotal - mode->hsync_end) & 0xFF);
regmap_write(pdata->regmap, SN_CHA_VERTICAL_BACK_PORCH_REG,
(mode->vtotal - mode->vsync_end) & 0xFF);
regmap_write(pdata->regmap, SN_CHA_HORIZONTAL_FRONT_PORCH_REG,
(mode->hsync_start - mode->hdisplay) & 0xFF);
regmap_write(pdata->regmap, SN_CHA_VERTICAL_FRONT_PORCH_REG,
(mode->vsync_start - mode->vdisplay) & 0xFF);
usleep_range(10000, 10500); /* 10ms delay recommended by spec */
}
static unsigned int ti_sn_get_max_lanes(struct ti_sn_bridge *pdata)
{
u8 data;
int ret;
ret = drm_dp_dpcd_readb(&pdata->aux, DP_MAX_LANE_COUNT, &data);
if (ret != 1) {
DRM_DEV_ERROR(pdata->dev,
"Can't read lane count (%d); assuming 4\n", ret);
return 4;
}
return data & DP_LANE_COUNT_MASK;
}
static int ti_sn_link_training(struct ti_sn_bridge *pdata, int dp_rate_idx,
const char **last_err_str)
{
unsigned int val;
int ret;
/* set dp clk frequency value */
regmap_update_bits(pdata->regmap, SN_DATARATE_CONFIG_REG,
DP_DATARATE_MASK, DP_DATARATE(dp_rate_idx));
/* enable DP PLL */
regmap_write(pdata->regmap, SN_PLL_ENABLE_REG, 1);
ret = regmap_read_poll_timeout(pdata->regmap, SN_DPPLL_SRC_REG, val,
val & DPPLL_SRC_DP_PLL_LOCK, 1000,
50 * 1000);
if (ret) {
*last_err_str = "DP_PLL_LOCK polling failed";
goto exit;
}
/* Semi auto link training mode */
regmap_write(pdata->regmap, SN_ML_TX_MODE_REG, 0x0A);
ret = regmap_read_poll_timeout(pdata->regmap, SN_ML_TX_MODE_REG, val,
val == ML_TX_MAIN_LINK_OFF ||
val == ML_TX_NORMAL_MODE, 1000,
500 * 1000);
if (ret) {
*last_err_str = "Training complete polling failed";
} else if (val == ML_TX_MAIN_LINK_OFF) {
*last_err_str = "Link training failed, link is off";
ret = -EIO;
}
exit:
/* Disable the PLL if we failed */
if (ret)
regmap_write(pdata->regmap, SN_PLL_ENABLE_REG, 0);
return ret;
}
static void ti_sn_bridge_enable(struct drm_bridge *bridge)
{
struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge);
bool rate_valid[ARRAY_SIZE(ti_sn_bridge_dp_rate_lut)] = { };
const char *last_err_str = "No supported DP rate";
int dp_rate_idx;
unsigned int val;
int ret = -EINVAL;
int max_dp_lanes;
max_dp_lanes = ti_sn_get_max_lanes(pdata);
pdata->dp_lanes = min(pdata->dp_lanes, max_dp_lanes);
/* DSI_A lane config */
val = CHA_DSI_LANES(SN_MAX_DP_LANES - pdata->dsi->lanes);
regmap_update_bits(pdata->regmap, SN_DSI_LANES_REG,
CHA_DSI_LANES_MASK, val);
regmap_write(pdata->regmap, SN_LN_ASSIGN_REG, pdata->ln_assign);
regmap_update_bits(pdata->regmap, SN_ENH_FRAME_REG, LN_POLRS_MASK,
pdata->ln_polrs << LN_POLRS_OFFSET);
/* set dsi clk frequency value */
ti_sn_bridge_set_dsi_rate(pdata);
/**
* The SN65DSI86 only supports ASSR Display Authentication method and
* this method is enabled by default. An eDP panel must support this
* authentication method. We need to enable this method in the eDP panel
* at DisplayPort address 0x0010A prior to link training.
*/
drm_dp_dpcd_writeb(&pdata->aux, DP_EDP_CONFIGURATION_SET,
DP_ALTERNATE_SCRAMBLER_RESET_ENABLE);
/* Set the DP output format (18 bpp or 24 bpp) */
val = (ti_sn_bridge_get_bpp(pdata) == 18) ? BPP_18_RGB : 0;
regmap_update_bits(pdata->regmap, SN_DATA_FORMAT_REG, BPP_18_RGB, val);
/* DP lane config */
val = DP_NUM_LANES(min(pdata->dp_lanes, 3));
regmap_update_bits(pdata->regmap, SN_SSC_CONFIG_REG, DP_NUM_LANES_MASK,
val);
ti_sn_bridge_read_valid_rates(pdata, rate_valid);
/* Train until we run out of rates */
for (dp_rate_idx = ti_sn_bridge_calc_min_dp_rate_idx(pdata);
dp_rate_idx < ARRAY_SIZE(ti_sn_bridge_dp_rate_lut);
dp_rate_idx++) {
if (!rate_valid[dp_rate_idx])
continue;
ret = ti_sn_link_training(pdata, dp_rate_idx, &last_err_str);
if (!ret)
break;
}
if (ret) {
DRM_DEV_ERROR(pdata->dev, "%s (%d)\n", last_err_str, ret);
return;
}
/* config video parameters */
ti_sn_bridge_set_video_timings(pdata);
/* enable video stream */
regmap_update_bits(pdata->regmap, SN_ENH_FRAME_REG, VSTREAM_ENABLE,
VSTREAM_ENABLE);
drm_panel_enable(pdata->panel);
}
static void ti_sn_bridge_pre_enable(struct drm_bridge *bridge)
{
struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge);
pm_runtime_get_sync(pdata->dev);
/* configure bridge ref_clk */
ti_sn_bridge_set_refclk_freq(pdata);
/*
* HPD on this bridge chip is a bit useless. This is an eDP bridge
* so the HPD is an internal signal that's only there to signal that
* the panel is done powering up. ...but the bridge chip debounces
* this signal by between 100 ms and 400 ms (depending on process,
* voltage, and temperate--I measured it at about 200 ms). One
* particular panel asserted HPD 84 ms after it was powered on meaning
* that we saw HPD 284 ms after power on. ...but the same panel said
* that instead of looking at HPD you could just hardcode a delay of
* 200 ms. We'll assume that the panel driver will have the hardcoded
* delay in its prepare and always disable HPD.
*
* If HPD somehow makes sense on some future panel we'll have to
* change this to be conditional on someone specifying that HPD should
* be used.
*/
regmap_update_bits(pdata->regmap, SN_HPD_DISABLE_REG, HPD_DISABLE,
HPD_DISABLE);
drm_panel_prepare(pdata->panel);
}
static void ti_sn_bridge_post_disable(struct drm_bridge *bridge)
{
struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge);
if (pdata->refclk)
clk_disable_unprepare(pdata->refclk);
pm_runtime_put_sync(pdata->dev);
}
static const struct drm_bridge_funcs ti_sn_bridge_funcs = {
.attach = ti_sn_bridge_attach,
.pre_enable = ti_sn_bridge_pre_enable,
.enable = ti_sn_bridge_enable,
.disable = ti_sn_bridge_disable,
.post_disable = ti_sn_bridge_post_disable,
};
static struct ti_sn_bridge *aux_to_ti_sn_bridge(struct drm_dp_aux *aux)
{
return container_of(aux, struct ti_sn_bridge, aux);
}
static ssize_t ti_sn_aux_transfer(struct drm_dp_aux *aux,
struct drm_dp_aux_msg *msg)
{
struct ti_sn_bridge *pdata = aux_to_ti_sn_bridge(aux);
u32 request = msg->request & ~DP_AUX_I2C_MOT;
u32 request_val = AUX_CMD_REQ(msg->request);
u8 *buf = (u8 *)msg->buffer;
unsigned int val;
int ret, i;
if (msg->size > SN_AUX_MAX_PAYLOAD_BYTES)
return -EINVAL;
switch (request) {
case DP_AUX_NATIVE_WRITE:
case DP_AUX_I2C_WRITE:
case DP_AUX_NATIVE_READ:
case DP_AUX_I2C_READ:
regmap_write(pdata->regmap, SN_AUX_CMD_REG, request_val);
break;
default:
return -EINVAL;
}
regmap_write(pdata->regmap, SN_AUX_ADDR_19_16_REG,
(msg->address >> 16) & 0xF);
regmap_write(pdata->regmap, SN_AUX_ADDR_15_8_REG,
(msg->address >> 8) & 0xFF);
regmap_write(pdata->regmap, SN_AUX_ADDR_7_0_REG, msg->address & 0xFF);
regmap_write(pdata->regmap, SN_AUX_LENGTH_REG, msg->size);
if (request == DP_AUX_NATIVE_WRITE || request == DP_AUX_I2C_WRITE) {
for (i = 0; i < msg->size; i++)
regmap_write(pdata->regmap, SN_AUX_WDATA_REG(i),
buf[i]);
}
/* Clear old status bits before start so we don't get confused */
regmap_write(pdata->regmap, SN_AUX_CMD_STATUS_REG,
AUX_IRQ_STATUS_NAT_I2C_FAIL |
AUX_IRQ_STATUS_AUX_RPLY_TOUT |
AUX_IRQ_STATUS_AUX_SHORT);
regmap_write(pdata->regmap, SN_AUX_CMD_REG, request_val | AUX_CMD_SEND);
ret = regmap_read_poll_timeout(pdata->regmap, SN_AUX_CMD_REG, val,
!(val & AUX_CMD_SEND), 200,
50 * 1000);
if (ret)
return ret;
ret = regmap_read(pdata->regmap, SN_AUX_CMD_STATUS_REG, &val);
if (ret)
return ret;
else if ((val & AUX_IRQ_STATUS_NAT_I2C_FAIL)
|| (val & AUX_IRQ_STATUS_AUX_RPLY_TOUT)
|| (val & AUX_IRQ_STATUS_AUX_SHORT))
return -ENXIO;
if (request == DP_AUX_NATIVE_WRITE || request == DP_AUX_I2C_WRITE)
return msg->size;
for (i = 0; i < msg->size; i++) {
unsigned int val;
ret = regmap_read(pdata->regmap, SN_AUX_RDATA_REG(i),
&val);
if (ret)
return ret;
WARN_ON(val & ~0xFF);
buf[i] = (u8)(val & 0xFF);
}
return msg->size;
}
static int ti_sn_bridge_parse_dsi_host(struct ti_sn_bridge *pdata)
{
struct device_node *np = pdata->dev->of_node;
pdata->host_node = of_graph_get_remote_node(np, 0, 0);
if (!pdata->host_node) {
DRM_ERROR("remote dsi host node not found\n");
return -ENODEV;
}
return 0;
}
#if defined(CONFIG_OF_GPIO)
static int tn_sn_bridge_of_xlate(struct gpio_chip *chip,
const struct of_phandle_args *gpiospec,
u32 *flags)
{
if (WARN_ON(gpiospec->args_count < chip->of_gpio_n_cells))
return -EINVAL;
if (gpiospec->args[0] > chip->ngpio || gpiospec->args[0] < 1)
return -EINVAL;
if (flags)
*flags = gpiospec->args[1];
return gpiospec->args[0] - SN_GPIO_PHYSICAL_OFFSET;
}
static int ti_sn_bridge_gpio_get_direction(struct gpio_chip *chip,
unsigned int offset)
{
struct ti_sn_bridge *pdata = gpiochip_get_data(chip);
/*
* We already have to keep track of the direction because we use
* that to figure out whether we've powered the device. We can
* just return that rather than (maybe) powering up the device
* to ask its direction.
*/
return test_bit(offset, pdata->gchip_output) ?
GPIO_LINE_DIRECTION_OUT : GPIO_LINE_DIRECTION_IN;
}
static int ti_sn_bridge_gpio_get(struct gpio_chip *chip, unsigned int offset)
{
struct ti_sn_bridge *pdata = gpiochip_get_data(chip);
unsigned int val;
int ret;
/*
* When the pin is an input we don't forcibly keep the bridge
* powered--we just power it on to read the pin. NOTE: part of
* the reason this works is that the bridge defaults (when
* powered back on) to all 4 GPIOs being configured as GPIO input.
* Also note that if something else is keeping the chip powered the
* pm_runtime functions are lightweight increments of a refcount.
*/
pm_runtime_get_sync(pdata->dev);
ret = regmap_read(pdata->regmap, SN_GPIO_IO_REG, &val);
pm_runtime_put(pdata->dev);
if (ret)
return ret;
return !!(val & BIT(SN_GPIO_INPUT_SHIFT + offset));
}
static void ti_sn_bridge_gpio_set(struct gpio_chip *chip, unsigned int offset,
int val)
{
struct ti_sn_bridge *pdata = gpiochip_get_data(chip);
int ret;
if (!test_bit(offset, pdata->gchip_output)) {
dev_err(pdata->dev, "Ignoring GPIO set while input\n");
return;
}
val &= 1;
ret = regmap_update_bits(pdata->regmap, SN_GPIO_IO_REG,
BIT(SN_GPIO_OUTPUT_SHIFT + offset),
val << (SN_GPIO_OUTPUT_SHIFT + offset));
if (ret)
dev_warn(pdata->dev,
"Failed to set bridge GPIO %u: %d\n", offset, ret);
}
static int ti_sn_bridge_gpio_direction_input(struct gpio_chip *chip,
unsigned int offset)
{
struct ti_sn_bridge *pdata = gpiochip_get_data(chip);
int shift = offset * 2;
int ret;
if (!test_and_clear_bit(offset, pdata->gchip_output))
return 0;
ret = regmap_update_bits(pdata->regmap, SN_GPIO_CTRL_REG,
SN_GPIO_MUX_MASK << shift,
SN_GPIO_MUX_INPUT << shift);
if (ret) {
set_bit(offset, pdata->gchip_output);
return ret;
}
/*
* NOTE: if nobody else is powering the device this may fully power
* it off and when it comes back it will have lost all state, but
* that's OK because the default is input and we're now an input.
*/
pm_runtime_put(pdata->dev);
return 0;
}
static int ti_sn_bridge_gpio_direction_output(struct gpio_chip *chip,
unsigned int offset, int val)
{
struct ti_sn_bridge *pdata = gpiochip_get_data(chip);
int shift = offset * 2;
int ret;
if (test_and_set_bit(offset, pdata->gchip_output))
return 0;
pm_runtime_get_sync(pdata->dev);
/* Set value first to avoid glitching */
ti_sn_bridge_gpio_set(chip, offset, val);
/* Set direction */
ret = regmap_update_bits(pdata->regmap, SN_GPIO_CTRL_REG,
SN_GPIO_MUX_MASK << shift,
SN_GPIO_MUX_OUTPUT << shift);
if (ret) {
clear_bit(offset, pdata->gchip_output);
pm_runtime_put(pdata->dev);
}
return ret;
}
static void ti_sn_bridge_gpio_free(struct gpio_chip *chip, unsigned int offset)
{
/* We won't keep pm_runtime if we're input, so switch there on free */
ti_sn_bridge_gpio_direction_input(chip, offset);
}
static const char * const ti_sn_bridge_gpio_names[SN_NUM_GPIOS] = {
"GPIO1", "GPIO2", "GPIO3", "GPIO4"
};
static int ti_sn_setup_gpio_controller(struct ti_sn_bridge *pdata)
{
int ret;
/* Only init if someone is going to use us as a GPIO controller */
if (!of_property_read_bool(pdata->dev->of_node, "gpio-controller"))
return 0;
pdata->gchip.label = dev_name(pdata->dev);
pdata->gchip.parent = pdata->dev;
pdata->gchip.owner = THIS_MODULE;
pdata->gchip.of_xlate = tn_sn_bridge_of_xlate;
pdata->gchip.of_gpio_n_cells = 2;
pdata->gchip.free = ti_sn_bridge_gpio_free;
pdata->gchip.get_direction = ti_sn_bridge_gpio_get_direction;
pdata->gchip.direction_input = ti_sn_bridge_gpio_direction_input;
pdata->gchip.direction_output = ti_sn_bridge_gpio_direction_output;
pdata->gchip.get = ti_sn_bridge_gpio_get;
pdata->gchip.set = ti_sn_bridge_gpio_set;
pdata->gchip.can_sleep = true;
pdata->gchip.names = ti_sn_bridge_gpio_names;
pdata->gchip.ngpio = SN_NUM_GPIOS;
pdata->gchip.base = -1;
ret = devm_gpiochip_add_data(pdata->dev, &pdata->gchip, pdata);
if (ret)
dev_err(pdata->dev, "can't add gpio chip\n");
return ret;
}
#else
static inline int ti_sn_setup_gpio_controller(struct ti_sn_bridge *pdata)
{
return 0;
}
#endif
static void ti_sn_bridge_parse_lanes(struct ti_sn_bridge *pdata,
struct device_node *np)
{
u32 lane_assignments[SN_MAX_DP_LANES] = { 0, 1, 2, 3 };
u32 lane_polarities[SN_MAX_DP_LANES] = { };
struct device_node *endpoint;
u8 ln_assign = 0;
u8 ln_polrs = 0;
int dp_lanes;
int i;
/*
* Read config from the device tree about lane remapping and lane
* polarities. These are optional and we assume identity map and
* normal polarity if nothing is specified. It's OK to specify just
* data-lanes but not lane-polarities but not vice versa.
*
* Error checking is light (we just make sure we don't crash or
* buffer overrun) and we assume dts is well formed and specifying
* mappings that the hardware supports.
*/
endpoint = of_graph_get_endpoint_by_regs(np, 1, -1);
dp_lanes = of_property_count_u32_elems(endpoint, "data-lanes");
if (dp_lanes > 0 && dp_lanes <= SN_MAX_DP_LANES) {
of_property_read_u32_array(endpoint, "data-lanes",
lane_assignments, dp_lanes);
of_property_read_u32_array(endpoint, "lane-polarities",
lane_polarities, dp_lanes);
} else {
dp_lanes = SN_MAX_DP_LANES;
}
of_node_put(endpoint);
/*
* Convert into register format. Loop over all lanes even if
* data-lanes had fewer elements so that we nicely initialize
* the LN_ASSIGN register.
*/
for (i = SN_MAX_DP_LANES - 1; i >= 0; i--) {
ln_assign = ln_assign << LN_ASSIGN_WIDTH | lane_assignments[i];
ln_polrs = ln_polrs << 1 | lane_polarities[i];
}
/* Stash in our struct for when we power on */
pdata->dp_lanes = dp_lanes;
pdata->ln_assign = ln_assign;
pdata->ln_polrs = ln_polrs;
}
static int ti_sn_bridge_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct ti_sn_bridge *pdata;
int ret;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
DRM_ERROR("device doesn't support I2C\n");
return -ENODEV;
}
pdata = devm_kzalloc(&client->dev, sizeof(struct ti_sn_bridge),
GFP_KERNEL);
if (!pdata)
return -ENOMEM;
pdata->regmap = devm_regmap_init_i2c(client,
&ti_sn_bridge_regmap_config);
if (IS_ERR(pdata->regmap)) {
DRM_ERROR("regmap i2c init failed\n");
return PTR_ERR(pdata->regmap);
}
pdata->dev = &client->dev;
ret = drm_of_find_panel_or_bridge(pdata->dev->of_node, 1, 0,
&pdata->panel, NULL);
if (ret) {
DRM_ERROR("could not find any panel node\n");
return ret;
}
dev_set_drvdata(&client->dev, pdata);
pdata->enable_gpio = devm_gpiod_get(pdata->dev, "enable",
GPIOD_OUT_LOW);
if (IS_ERR(pdata->enable_gpio)) {
DRM_ERROR("failed to get enable gpio from DT\n");
ret = PTR_ERR(pdata->enable_gpio);
return ret;
}
ti_sn_bridge_parse_lanes(pdata, client->dev.of_node);
ret = ti_sn_bridge_parse_regulators(pdata);
if (ret) {
DRM_ERROR("failed to parse regulators\n");
return ret;
}
pdata->refclk = devm_clk_get(pdata->dev, "refclk");
if (IS_ERR(pdata->refclk)) {
ret = PTR_ERR(pdata->refclk);
if (ret == -EPROBE_DEFER)
return ret;
DRM_DEBUG_KMS("refclk not found\n");
pdata->refclk = NULL;
}
ret = ti_sn_bridge_parse_dsi_host(pdata);
if (ret)
return ret;
pm_runtime_enable(pdata->dev);
ret = ti_sn_setup_gpio_controller(pdata);
if (ret) {
pm_runtime_disable(pdata->dev);
return ret;
}
i2c_set_clientdata(client, pdata);
pdata->aux.name = "ti-sn65dsi86-aux";
pdata->aux.dev = pdata->dev;
pdata->aux.transfer = ti_sn_aux_transfer;
drm_dp_aux_register(&pdata->aux);
pdata->bridge.funcs = &ti_sn_bridge_funcs;
pdata->bridge.of_node = client->dev.of_node;
drm_bridge_add(&pdata->bridge);
ti_sn_debugfs_init(pdata);
return 0;
}
static int ti_sn_bridge_remove(struct i2c_client *client)
{
struct ti_sn_bridge *pdata = i2c_get_clientdata(client);
if (!pdata)
return -EINVAL;
ti_sn_debugfs_remove(pdata);
of_node_put(pdata->host_node);
pm_runtime_disable(pdata->dev);
if (pdata->dsi) {
mipi_dsi_detach(pdata->dsi);
mipi_dsi_device_unregister(pdata->dsi);
}
drm_bridge_remove(&pdata->bridge);
return 0;
}
static struct i2c_device_id ti_sn_bridge_id[] = {
{ "ti,sn65dsi86", 0},
{},
};
MODULE_DEVICE_TABLE(i2c, ti_sn_bridge_id);
static const struct of_device_id ti_sn_bridge_match_table[] = {
{.compatible = "ti,sn65dsi86"},
{},
};
MODULE_DEVICE_TABLE(of, ti_sn_bridge_match_table);
static struct i2c_driver ti_sn_bridge_driver = {
.driver = {
.name = "ti_sn65dsi86",
.of_match_table = ti_sn_bridge_match_table,
.pm = &ti_sn_bridge_pm_ops,
},
.probe = ti_sn_bridge_probe,
.remove = ti_sn_bridge_remove,
.id_table = ti_sn_bridge_id,
};
module_i2c_driver(ti_sn_bridge_driver);
MODULE_AUTHOR("Sandeep Panda <spanda@codeaurora.org>");
MODULE_DESCRIPTION("sn65dsi86 DSI to eDP bridge driver");
MODULE_LICENSE("GPL v2");
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