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9bf7123bb0
Many DSI panel drivers fail to clean up their panel references on mipi_dsi_attach() failure, so we're leaving a dangling drm_panel reference to freed memory. Clean that up on failure. Noticed by inspection, after seeing similar problems on other drivers. Therefore, I'm not marking Fixes/stable. Signed-off-by: Brian Norris <briannorris@chromium.org> Signed-off-by: Sam Ravnborg <sam@ravnborg.org> Link: https://patchwork.freedesktop.org/patch/msgid/20210923173336.3.If9e74fa9b1d6eaa9e0e5b95b2b957b992740251c@changeid
292 lines
6.5 KiB
C
292 lines
6.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2015 Red Hat
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* Copyright (C) 2015 Sony Mobile Communications Inc.
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* Author: Werner Johansson <werner.johansson@sonymobile.com>
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*
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* Based on AUO panel driver by Rob Clark <robdclark@gmail.com>
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*/
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/regulator/consumer.h>
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#include <video/mipi_display.h>
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#include <drm/drm_crtc.h>
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#include <drm/drm_device.h>
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#include <drm/drm_mipi_dsi.h>
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#include <drm/drm_panel.h>
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/*
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* When power is turned off to this panel a minimum off time of 500ms has to be
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* observed before powering back on as there's no external reset pin. Keep
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* track of earliest wakeup time and delay subsequent prepare call accordingly
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*/
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#define MIN_POFF_MS (500)
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struct wuxga_nt_panel {
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struct drm_panel base;
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struct mipi_dsi_device *dsi;
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struct regulator *supply;
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bool prepared;
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bool enabled;
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ktime_t earliest_wake;
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const struct drm_display_mode *mode;
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};
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static inline struct wuxga_nt_panel *to_wuxga_nt_panel(struct drm_panel *panel)
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{
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return container_of(panel, struct wuxga_nt_panel, base);
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}
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static int wuxga_nt_panel_on(struct wuxga_nt_panel *wuxga_nt)
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{
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return mipi_dsi_turn_on_peripheral(wuxga_nt->dsi);
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}
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static int wuxga_nt_panel_disable(struct drm_panel *panel)
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{
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struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
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int mipi_ret, bl_ret = 0;
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if (!wuxga_nt->enabled)
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return 0;
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mipi_ret = mipi_dsi_shutdown_peripheral(wuxga_nt->dsi);
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wuxga_nt->enabled = false;
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return mipi_ret ? mipi_ret : bl_ret;
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}
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static int wuxga_nt_panel_unprepare(struct drm_panel *panel)
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{
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struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
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if (!wuxga_nt->prepared)
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return 0;
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regulator_disable(wuxga_nt->supply);
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wuxga_nt->earliest_wake = ktime_add_ms(ktime_get_real(), MIN_POFF_MS);
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wuxga_nt->prepared = false;
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return 0;
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}
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static int wuxga_nt_panel_prepare(struct drm_panel *panel)
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{
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struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
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int ret;
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s64 enablewait;
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if (wuxga_nt->prepared)
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return 0;
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/*
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* If the user re-enabled the panel before the required off-time then
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* we need to wait the remaining period before re-enabling regulator
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*/
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enablewait = ktime_ms_delta(wuxga_nt->earliest_wake, ktime_get_real());
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/* Sanity check, this should never happen */
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if (enablewait > MIN_POFF_MS)
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enablewait = MIN_POFF_MS;
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if (enablewait > 0)
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msleep(enablewait);
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ret = regulator_enable(wuxga_nt->supply);
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if (ret < 0)
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return ret;
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/*
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* A minimum delay of 250ms is required after power-up until commands
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* can be sent
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*/
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msleep(250);
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ret = wuxga_nt_panel_on(wuxga_nt);
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if (ret < 0) {
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dev_err(panel->dev, "failed to set panel on: %d\n", ret);
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goto poweroff;
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}
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wuxga_nt->prepared = true;
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return 0;
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poweroff:
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regulator_disable(wuxga_nt->supply);
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return ret;
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}
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static int wuxga_nt_panel_enable(struct drm_panel *panel)
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{
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struct wuxga_nt_panel *wuxga_nt = to_wuxga_nt_panel(panel);
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if (wuxga_nt->enabled)
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return 0;
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wuxga_nt->enabled = true;
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return 0;
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}
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static const struct drm_display_mode default_mode = {
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.clock = 164402,
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.hdisplay = 1920,
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.hsync_start = 1920 + 152,
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.hsync_end = 1920 + 152 + 52,
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.htotal = 1920 + 152 + 52 + 20,
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.vdisplay = 1200,
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.vsync_start = 1200 + 24,
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.vsync_end = 1200 + 24 + 6,
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.vtotal = 1200 + 24 + 6 + 48,
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};
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static int wuxga_nt_panel_get_modes(struct drm_panel *panel,
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struct drm_connector *connector)
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{
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struct drm_display_mode *mode;
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mode = drm_mode_duplicate(connector->dev, &default_mode);
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if (!mode) {
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dev_err(panel->dev, "failed to add mode %ux%u@%u\n",
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default_mode.hdisplay, default_mode.vdisplay,
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drm_mode_vrefresh(&default_mode));
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return -ENOMEM;
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}
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drm_mode_set_name(mode);
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drm_mode_probed_add(connector, mode);
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connector->display_info.width_mm = 217;
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connector->display_info.height_mm = 136;
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return 1;
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}
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static const struct drm_panel_funcs wuxga_nt_panel_funcs = {
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.disable = wuxga_nt_panel_disable,
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.unprepare = wuxga_nt_panel_unprepare,
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.prepare = wuxga_nt_panel_prepare,
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.enable = wuxga_nt_panel_enable,
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.get_modes = wuxga_nt_panel_get_modes,
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};
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static const struct of_device_id wuxga_nt_of_match[] = {
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{ .compatible = "panasonic,vvx10f034n00", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, wuxga_nt_of_match);
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static int wuxga_nt_panel_add(struct wuxga_nt_panel *wuxga_nt)
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{
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struct device *dev = &wuxga_nt->dsi->dev;
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int ret;
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wuxga_nt->mode = &default_mode;
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wuxga_nt->supply = devm_regulator_get(dev, "power");
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if (IS_ERR(wuxga_nt->supply))
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return PTR_ERR(wuxga_nt->supply);
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drm_panel_init(&wuxga_nt->base, &wuxga_nt->dsi->dev,
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&wuxga_nt_panel_funcs, DRM_MODE_CONNECTOR_DSI);
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ret = drm_panel_of_backlight(&wuxga_nt->base);
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if (ret)
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return ret;
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drm_panel_add(&wuxga_nt->base);
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return 0;
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}
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static void wuxga_nt_panel_del(struct wuxga_nt_panel *wuxga_nt)
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{
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if (wuxga_nt->base.dev)
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drm_panel_remove(&wuxga_nt->base);
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}
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static int wuxga_nt_panel_probe(struct mipi_dsi_device *dsi)
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{
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struct wuxga_nt_panel *wuxga_nt;
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int ret;
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dsi->lanes = 4;
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dsi->format = MIPI_DSI_FMT_RGB888;
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dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
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MIPI_DSI_MODE_VIDEO_HSE |
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MIPI_DSI_CLOCK_NON_CONTINUOUS |
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MIPI_DSI_MODE_LPM;
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wuxga_nt = devm_kzalloc(&dsi->dev, sizeof(*wuxga_nt), GFP_KERNEL);
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if (!wuxga_nt)
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return -ENOMEM;
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mipi_dsi_set_drvdata(dsi, wuxga_nt);
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wuxga_nt->dsi = dsi;
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ret = wuxga_nt_panel_add(wuxga_nt);
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if (ret < 0)
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return ret;
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ret = mipi_dsi_attach(dsi);
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if (ret < 0) {
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wuxga_nt_panel_del(wuxga_nt);
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return ret;
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}
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return 0;
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}
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static int wuxga_nt_panel_remove(struct mipi_dsi_device *dsi)
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{
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struct wuxga_nt_panel *wuxga_nt = mipi_dsi_get_drvdata(dsi);
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int ret;
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ret = drm_panel_disable(&wuxga_nt->base);
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if (ret < 0)
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dev_err(&dsi->dev, "failed to disable panel: %d\n", ret);
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ret = mipi_dsi_detach(dsi);
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if (ret < 0)
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dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", ret);
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wuxga_nt_panel_del(wuxga_nt);
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return 0;
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}
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static void wuxga_nt_panel_shutdown(struct mipi_dsi_device *dsi)
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{
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struct wuxga_nt_panel *wuxga_nt = mipi_dsi_get_drvdata(dsi);
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drm_panel_disable(&wuxga_nt->base);
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}
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static struct mipi_dsi_driver wuxga_nt_panel_driver = {
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.driver = {
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.name = "panel-panasonic-vvx10f034n00",
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.of_match_table = wuxga_nt_of_match,
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},
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.probe = wuxga_nt_panel_probe,
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.remove = wuxga_nt_panel_remove,
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.shutdown = wuxga_nt_panel_shutdown,
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};
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module_mipi_dsi_driver(wuxga_nt_panel_driver);
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MODULE_AUTHOR("Werner Johansson <werner.johansson@sonymobile.com>");
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MODULE_DESCRIPTION("Panasonic VVX10F034N00 Novatek NT1397-based WUXGA (1920x1200) video mode panel driver");
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MODULE_LICENSE("GPL v2");
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