From: Lyude Paul lyude@redhat.com
[ Upstream commit 646596485e1ed2182adf293dfd5aec4a96c46330 ]
As it turns out, apparently some machines will actually leave additional backlight functionality like dynamic backlight control on before the OS loads. Currently we don't take care to disable unsupported features when writing back the backlight mode, which can lead to some rather strange looking behavior when adjusting the backlight.
So, let's fix this by just not reading back the current backlight mode on initial enable. I don't think there should really be any downsides to this, and this will ensure we don't leave any unsupported functionality enabled.
This should fix at least one (but not all) of the issues seen with DPCD backlight support on fi-bdw-samus
v5: * Just avoid reading back DPCD register - Doug Anderson
Signed-off-by: Lyude Paul lyude@redhat.com Fixes: 867cf9cd73c3 ("drm/dp: Extract i915's eDP backlight code into DRM helpers") Reviewed-by: Douglas Anderson dianders@chromium.org Link: https://patchwork.freedesktop.org/patch/msgid/20211105183342.130810-4-lyude@... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/drm_dp_helper.c | 40 ++++++++++----------------------- 1 file changed, 12 insertions(+), 28 deletions(-)
diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index 4d0d1e8e51fa7..db7db839e42d1 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -3246,27 +3246,13 @@ int drm_edp_backlight_enable(struct drm_dp_aux *aux, const struct drm_edp_backli const u16 level) { int ret; - u8 dpcd_buf, new_dpcd_buf; + u8 dpcd_buf = DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD;
- ret = drm_dp_dpcd_readb(aux, DP_EDP_BACKLIGHT_MODE_SET_REGISTER, &dpcd_buf); - if (ret != 1) { - drm_dbg_kms(aux->drm_dev, - "%s: Failed to read backlight mode: %d\n", aux->name, ret); - return ret < 0 ? ret : -EIO; - } - - new_dpcd_buf = dpcd_buf; - - if ((dpcd_buf & DP_EDP_BACKLIGHT_CONTROL_MODE_MASK) != DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD) { - new_dpcd_buf &= ~DP_EDP_BACKLIGHT_CONTROL_MODE_MASK; - new_dpcd_buf |= DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD; - - if (bl->pwmgen_bit_count) { - ret = drm_dp_dpcd_writeb(aux, DP_EDP_PWMGEN_BIT_COUNT, bl->pwmgen_bit_count); - if (ret != 1) - drm_dbg_kms(aux->drm_dev, "%s: Failed to write aux pwmgen bit count: %d\n", - aux->name, ret); - } + if (bl->pwmgen_bit_count) { + ret = drm_dp_dpcd_writeb(aux, DP_EDP_PWMGEN_BIT_COUNT, bl->pwmgen_bit_count); + if (ret != 1) + drm_dbg_kms(aux->drm_dev, "%s: Failed to write aux pwmgen bit count: %d\n", + aux->name, ret); }
if (bl->pwm_freq_pre_divider) { @@ -3276,16 +3262,14 @@ int drm_edp_backlight_enable(struct drm_dp_aux *aux, const struct drm_edp_backli "%s: Failed to write aux backlight frequency: %d\n", aux->name, ret); else - new_dpcd_buf |= DP_EDP_BACKLIGHT_FREQ_AUX_SET_ENABLE; + dpcd_buf |= DP_EDP_BACKLIGHT_FREQ_AUX_SET_ENABLE; }
- if (new_dpcd_buf != dpcd_buf) { - ret = drm_dp_dpcd_writeb(aux, DP_EDP_BACKLIGHT_MODE_SET_REGISTER, new_dpcd_buf); - if (ret != 1) { - drm_dbg_kms(aux->drm_dev, "%s: Failed to write aux backlight mode: %d\n", - aux->name, ret); - return ret < 0 ? ret : -EIO; - } + ret = drm_dp_dpcd_writeb(aux, DP_EDP_BACKLIGHT_MODE_SET_REGISTER, dpcd_buf); + if (ret != 1) { + drm_dbg_kms(aux->drm_dev, "%s: Failed to write aux backlight mode: %d\n", + aux->name, ret); + return ret < 0 ? ret : -EIO; }
ret = drm_edp_backlight_set_level(aux, bl, level);