[PATCH 5.19 148/155] drm/i915/backlight: Disable pps power hook for aux based backlight

Greg Kroah-Hartman
2022-09-06T14:20:49Z

From: Jouni Högander <jouni.hogander@intel.com>

commit 51fbbe8a3f8b9dd128fa98f6ea36058dfa3f36de upstream.

Pps power hook seems to be problematic for backlight controlled via
aux channel. Disable it for such cases.

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/3657
Cc: stable@vger.kernel.org
Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220822140836.534432-1-jouni.hogander@intel.com
(cherry picked from commit 869e3bb7acb59d88c1226892136661810e8223a4)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/gpu/drm/i915/display/intel_backlight.c | 11 ++++++++---
drivers/gpu/drm/i915/display/intel_dp.c | 2 --
2 files changed, 8 insertions(+), 5 deletions(-)

--- a/drivers/gpu/drm/i915/display/intel_backlight.c
+++ b/drivers/gpu/drm/i915/display/intel_backlight.c
@@ -15,6 +15,7 @@
#include "intel_dsi_dcs_backlight.h"
#include "intel_panel.h"
#include "intel_pci_config.h"
+#include "intel_pps.h"

/**
* scale - scale values from one range to another
@@ -1769,9 +1770,13 @@ void intel_backlight_init_funcs(struct i
panel->backlight.pwm_funcs = &i9xx_pwm_funcs;
}

- if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP &&
- intel_dp_aux_init_backlight_funcs(connector) == 0)
- return;
+ if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP) {
+ if (intel_dp_aux_init_backlight_funcs(connector) == 0)
+ return;
+
+ if (!(dev_priv->quirks & QUIRK_NO_PPS_BACKLIGHT_POWER_HOOK))
+ connector->panel.backlight.power = intel_pps_backlight_power;
+ }

/* We're using a standard PWM backlight interface */
panel->backlight.funcs = &pwm_bl_funcs;
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -5248,8 +5248,6 @@ static bool intel_edp_init_connector(str

intel_panel_init(intel_connector);

- if (!(dev_priv->quirks & QUIRK_NO_PPS_BACKLIGHT_POWER_HOOK))
- intel_connector->panel.backlight.power = intel_pps_backlight_power;
intel_backlight_setup(intel_connector, pipe);

intel_edp_add_properties(intel_dp);