[PATCH 2/7] drm/i915: Assume 100% brightness when not in DPCD control mode

Currently we always determine the initial panel brightness level by simply reading the value from DP_EDP_BACKLIGHT_BRIGHTNESS_MSB/LSB. This seems wrong though, because if the panel is not currently in DPCD control mode there's not really any reason why there would be any brightness value programmed in the first place. This appears to be the case on the Lenovo ThinkPad X1 Extreme 2nd Generation, where the default value in these registers is always 0 on boot despite the fact the panel runs at max brightness by default. Getting the initial brightness value correct here is important as well, since the panel on this laptop doesn't behave well if it's ever put into DPCD control mode while the brightness level is programmed to 0. So, let's fix this by checking what the current backlight control mode is before reading the brightness level. If it's in DPCD control mode, we return the programmed brightness level. Otherwise we assume 100% brightness and return the highest possible brightness level. This also prevents us from accidentally programming a brightness level of 0. This is one of the many fixes that gets backlight controls working on the ThinkPad X1 Extreme 2nd Generation with optional 4K AMOLED screen. Changes since v1: * s/DP_EDP_DISPLAY_CONTROL_REGISTER/DP_EDP_BACKLIGHT_MODE_SET_REGISTER/ - Jani Tested-by: AceLan Kao <acelan.kao(a)canonical.com&gt; Tested-by: Perry Yuan <pyuan(a)redhat.com&gt; Signed-off-by: Lyude Paul <lyude(a)redhat.com&gt; Signed-off-by: Jani Nikula <jani.nikula(a)intel.com&gt; Link: https://patchwork.freedesktop.org/patch/msgid/20200116211623.53799-3-lyud... --- .../drm/i915/display/intel_dp_aux_backlight.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c index 345eed641455..5d4db5f8a165 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c +++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c @@ -59,8 +59,25 @@ static u32 intel_dp_aux_get_backlight(struct intel_connector *connector) { struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder); u8 read_val[2] = { 0x0 }; + u8 mode_reg; u16 level = 0; + if (drm_dp_dpcd_readb(&intel_dp->aux, + DP_EDP_BACKLIGHT_MODE_SET_REGISTER, + &mode_reg) != 1) { + DRM_DEBUG_KMS("Failed to read the DPCD register 0x%x\n", + DP_EDP_BACKLIGHT_MODE_SET_REGISTER); + return 0; + } + + /* + * If we're not in DPCD control mode yet, the programmed brightness + * value is meaningless and we should assume max brightness + */ + if ((mode_reg & DP_EDP_BACKLIGHT_CONTROL_MODE_MASK) != + DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD) + return connector->panel.backlight.max; + if (drm_dp_dpcd_read(&intel_dp->aux, DP_EDP_BACKLIGHT_BRIGHTNESS_MSB, &read_val, sizeof(read_val)) < 0) { DRM_DEBUG_KMS("Failed to read DPCD register 0x%x\n", -- 2.24.1