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drm/i915: keep backlight_enable on until turn eDP display off

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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.

v2: 1. modify the quirk name and debug messages.
    2. unregister backlight.power callback for specific device.
v3: 1. modify debug output messages.
    2. use DMI_EXACT_MATCH instead of DMI_MATCH.

Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Cooper Chiou <cooper.chiou@intel.com>
Signed-off-by: Lee Shawn C <shawn.c.lee@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210624053932.21037-1-shawn.c.lee@intel.com
This commit is contained in:
Lee Shawn C 2021-06-24 13:39:32 +08:00 committed by Jani Nikula
parent 8b95b28047
commit cdad39216a
3 changed files with 37 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
drivers/gpu/drm/i915/display/intel_dp.c
View file

@ -5238,7 +5238,8 @@ static bool intel_edp_init_connector(struct intel_dp *intel_dp,
}
intel_panel_init(&intel_connector->panel, fixed_mode, downclock_mode);
intel_connector->panel.backlight.power = intel_pps_backlight_power;
if (!(dev_priv->quirks & QUIRK_NO_PPS_BACKLIGHT_POWER_HOOK))
intel_connector->panel.backlight.power = intel_pps_backlight_power;
intel_panel_setup_backlight(connector, pipe);
if (fixed_mode) {

34
drivers/gpu/drm/i915/display/intel_quirks.c
View file

@ -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_no_pps_backlight_power_hook(struct drm_i915_private *i915)
{
i915->quirks |= QUIRK_NO_PPS_BACKLIGHT_POWER_HOOK;
drm_info(&i915->drm, "Applying no pps backlight power 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 intel_dmi_no_pps_backlight(const struct dmi_system_id *id)
{
DRM_INFO("No pps backlight support on %s\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 = intel_dmi_no_pps_backlight,
.ident = "Google Lillipup sku524294",
.matches = {DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "Google"),
DMI_EXACT_MATCH(DMI_BOARD_NAME, "Lindar"),
DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "sku524294"),
},
},
{
.callback = intel_dmi_no_pps_backlight,
.ident = "Google Lillipup sku524295",
.matches = {DMI_EXACT_MATCH(DMI_BOARD_VENDOR, "Google"),
DMI_EXACT_MATCH(DMI_BOARD_NAME, "Lindar"),
DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "sku524295"),
},
},
{ }
},
.hook = quirk_no_pps_backlight_power_hook,
},
};
static struct intel_quirk intel_quirks[] = {

1
drivers/gpu/drm/i915/i915_drv.h
View file

@ -466,6 +466,7 @@ 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_NO_PPS_BACKLIGHT_POWER_HOOK (1<<8)
struct intel_fbdev;
struct intel_fbc_work;