This workaround is specific for a particular panel on Google
chromebook project. When user space daemon enter idle state.
It request adjust brightness to 0, turn backlight_enable signal
off and keep eDP main link active.
On general LCD, this behavior might not be a problem.
But on this panel, its tcon would expect source to execute
full eDP power off sequence after drop backlight_enable signal.
Without eDP power off sequence. Even source try to turn
backlight_enable signal on and restore proper brightness level.
This panel is not able to light on again.
This WA ignored the request from user space daemon to disable
backlight_enable signal and keep it on always. When user space
request kernel to turn eDP display off, kernel driver still
can control backlight_enable signal properly. It would not
impact standard eDP power off sequence.
Cc: Ville Syrjala <ville.syrj...@linux.intel.com>
Cc: Imre Deak <imre.d...@intel.com>
Cc: Jani Nikula <jani.nik...@linux.intel.com>
Cc: Cooper Chiou <cooper.ch...@intel.com>
Signed-off-by: Lee Shawn C <shawn.c....@intel.com>
---
drivers/gpu/drm/i915/display/intel_panel.c | 4 ++-
drivers/gpu/drm/i915/display/intel_quirks.c | 34 +++++++++++++++++++++
drivers/gpu/drm/i915/i915_drv.h | 1 +
3 files changed, 38 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/display/intel_panel.c
b/drivers/gpu/drm/i915/display/intel_panel.c
index 7d7a60b4d2de..0212b53d932b 100644
--- a/drivers/gpu/drm/i915/display/intel_panel.c
+++ b/drivers/gpu/drm/i915/display/intel_panel.c
@@ -1311,6 +1311,7 @@ static void intel_panel_set_backlight(const struct
drm_connector_state *conn_sta
static int intel_backlight_device_update_status(struct backlight_device *bd)
{
struct intel_connector *connector = bl_get_data(bd);
+ struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
struct drm_device *dev = connector->base.dev;
@@ -1330,7 +1331,8 @@ static int intel_backlight_device_update_status(struct
backlight_device *bd)
if (panel->backlight.power) {
bool enable = bd->props.power == FB_BLANK_UNBLANK &&
bd->props.brightness != 0;
- panel->backlight.power(connector, enable);
+ if (enable || !(dev_priv->quirks &
QUIRK_KEEP_BACKLIGHT_ENABLE_ON))
+ panel->backlight.power(connector, enable);
}
} else {
bd->props.power = FB_BLANK_POWERDOWN;
diff --git a/drivers/gpu/drm/i915/display/intel_quirks.c
b/drivers/gpu/drm/i915/display/intel_quirks.c
index 98dd787b00e3..ed57b083edbb 100644
--- a/drivers/gpu/drm/i915/display/intel_quirks.c
+++ b/drivers/gpu/drm/i915/display/intel_quirks.c
@@ -53,6 +53,12 @@ static void quirk_increase_ddi_disabled_time(struct
drm_i915_private *i915)
drm_info(&i915->drm, "Applying Increase DDI Disabled quirk\n");
}
+static void quirk_keep_backlight_enable_on(struct drm_i915_private *i915)
+{
+ i915->quirks |= QUIRK_KEEP_BACKLIGHT_ENABLE_ON;
+ drm_info(&i915->drm, "applying keep backlight enable on quirk\n");
+}
+
struct intel_quirk {
int device;
int subsystem_vendor;
@@ -72,6 +78,12 @@ static int intel_dmi_reverse_brightness(const struct
dmi_system_id *id)
return 1;
}
+static int backlight_wa_callback(const struct dmi_system_id *id)
+{
+ DRM_INFO("This is WA to ignore backlight off to prevent OLED panel
issue on %s device\n", id->ident);
+ return 1;
+}
+
static const struct intel_dmi_quirk intel_dmi_quirks[] = {
{
.dmi_id_list = &(const struct dmi_system_id[]) {
@@ -96,6 +108,28 @@ static const struct intel_dmi_quirk intel_dmi_quirks[] = {
},
.hook = quirk_invert_brightness,
},
+ {
+ .dmi_id_list = &(const struct dmi_system_id[]) {
+ {
+ .callback = backlight_wa_callback,
+ .ident = "Google Lillipup",
+ .matches = {DMI_MATCH(DMI_BOARD_VENDOR,
"Google"),
+ DMI_MATCH(DMI_BOARD_NAME, "Lindar"),
+ DMI_MATCH(DMI_PRODUCT_SKU,
"sku524294"),
+ },
+ },
+ {
+ .callback = backlight_wa_callback,
+ .ident = "Google Lillipup",
+ .matches = {DMI_MATCH(DMI_BOARD_VENDOR,
"Google"),
+ DMI_MATCH(DMI_BOARD_NAME, "Lindar"),
+ DMI_MATCH(DMI_PRODUCT_SKU,
"sku524295"),
+ },
+ },
+ { }
+ },
+ .hook = quirk_keep_backlight_enable_on,
+ },
};
static struct intel_quirk intel_quirks[] = {
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 01e11fe38642..8103919bf3b4 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -467,6 +467,7 @@ struct i915_drrs {
#define QUIRK_PIN_SWIZZLED_PAGES (1<<5)
#define QUIRK_INCREASE_T12_DELAY (1<<6)
#define QUIRK_INCREASE_DDI_DISABLED_TIME (1<<7)
+#define QUIRK_KEEP_BACKLIGHT_ENABLE_ON (1<<8)
struct intel_fbdev;
struct intel_fbc_work;
--
2.17.1
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