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drm/panel: jh057n00900: Add regulator support

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Allow to specify regulators for vcc and iovcc. According to the data
sheet the panel wants vcc (2.8V) and iovcc (1.8V) and there's no startup
dependency between the two.

Signed-off-by: Guido Günther <agx@sigxcpu.org>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/f78611fb26329e50ec1533810fbb76562f2f4e48.1561542477.git.agx@sigxcpu.org
This commit is contained in:
Guido Günther 2019-06-26 12:37:51 +02:00 committed by Sam Ravnborg
parent d4bd9a58d8
commit 1a14e0c256
1 changed files with 41 additions and 0 deletions
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41
drivers/gpu/drm/panel/panel-rocktech-jh057n00900.c
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@ -15,6 +15,7 @@
#include <linux/gpio/consumer.h>
#include <linux/media-bus-format.h>
#include <linux/module.h>
#include <linux/regulator/consumer.h>
#include <video/display_timing.h>
#include <video/mipi_display.h>
@ -47,6 +48,8 @@ struct jh057n {
struct drm_panel panel;
struct gpio_desc *reset_gpio;
struct backlight_device *backlight;
struct regulator *vcc;
struct regulator *iovcc;
bool prepared;
struct dentry *debugfs;
@ -160,6 +163,8 @@ static int jh057n_unprepare(struct drm_panel *panel)
return 0;
mipi_dsi_dcs_set_display_off(dsi);
regulator_disable(ctx->iovcc);
regulator_disable(ctx->vcc);
ctx->prepared = false;
return 0;
@ -174,6 +179,19 @@ static int jh057n_prepare(struct drm_panel *panel)
return 0;
DRM_DEV_DEBUG_DRIVER(ctx->dev, "Resetting the panel\n");
ret = regulator_enable(ctx->vcc);
if (ret < 0) {
DRM_DEV_ERROR(ctx->dev,
"Failed to enable vcc supply: %d\n", ret);
return ret;
}
ret = regulator_enable(ctx->iovcc);
if (ret < 0) {
DRM_DEV_ERROR(ctx->dev,
"Failed to enable iovcc supply: %d\n", ret);
goto disable_vcc;
}
gpiod_set_value_cansleep(ctx->reset_gpio, 1);
usleep_range(20, 40);
gpiod_set_value_cansleep(ctx->reset_gpio, 0);
@ -189,6 +207,10 @@ static int jh057n_prepare(struct drm_panel *panel)
ctx->prepared = true;
return 0;
disable_vcc:
regulator_disable(ctx->vcc);
return ret;
}
static const struct drm_display_mode default_mode = {
@ -301,6 +323,25 @@ static int jh057n_probe(struct mipi_dsi_device *dsi)
if (IS_ERR(ctx->backlight))
return PTR_ERR(ctx->backlight);
ctx->vcc = devm_regulator_get(dev, "vcc");
if (IS_ERR(ctx->vcc)) {
ret = PTR_ERR(ctx->vcc);
if (ret != -EPROBE_DEFER)
DRM_DEV_ERROR(dev,
"Failed to request vcc regulator: %d\n",
ret);
return ret;
}
ctx->iovcc = devm_regulator_get(dev, "iovcc");
if (IS_ERR(ctx->iovcc)) {
ret = PTR_ERR(ctx->iovcc);
if (ret != -EPROBE_DEFER)
DRM_DEV_ERROR(dev,
"Failed to request iovcc regulator: %d\n",
ret);
return ret;
}
drm_panel_init(&ctx->panel);
ctx->panel.dev = dev;
ctx->panel.funcs = &jh057n_drm_funcs;