On Wed, Feb 3, 2021 at 7:42 AM Takashi Iwai <tiwai@xxxxxxx> wrote: > > There seem devices that don't work with the aux channel backlight > control. For allowing such users to test with the other backlight > control method, provide a new module option, aux_backlight, to specify > enabling or disabling the aux backport support explicitly. As > default, the aux support is detected by the hardware capability. > > BugLink: https://bugzilla.opensuse.org/show_bug.cgi?id=1180749 > BugLink: https://gitlab.freedesktop.org/drm/amd/-/issues/1438 > Signed-off-by: Takashi Iwai <tiwai@xxxxxxx> > --- > drivers/gpu/drm/amd/amdgpu/amdgpu.h | 1 + > drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 4 ++++ > drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 3 +++ > 3 files changed, 8 insertions(+) > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h > index 5993dd0fdd8e..4793cd5e69f9 100644 > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h > @@ -179,6 +179,7 @@ extern uint amdgpu_smu_memory_pool_size; > extern uint amdgpu_dc_feature_mask; > extern uint amdgpu_dc_debug_mask; > extern uint amdgpu_dm_abm_level; > +extern int amdgpu_aux_backlight; > extern struct amdgpu_mgpu_info mgpu_info; > extern int amdgpu_ras_enable; > extern uint amdgpu_ras_mask; > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c > index 7169fb5e3d9c..5b66822da954 100644 > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c > @@ -777,6 +777,10 @@ uint amdgpu_dm_abm_level; > MODULE_PARM_DESC(abmlevel, "ABM level (0 = off (default), 1-4 = backlight reduction level) "); > module_param_named(abmlevel, amdgpu_dm_abm_level, uint, 0444); > > +int amdgpu_aux_backlight = -1; > +MODULE_PARM_DESC(aux_backlight, "Aux backlight control (0 = off, 1 = on, default auto)"); > +module_param_named(aux_backlight, amdgpu_aux_backlight, bint, 0444); I'd suggest making this something more generic like "backlight" and make -1 auto, 0 pwm, 1 aux. That way we can handle potential future types more cleanly. Alex > + > /** > * DOC: tmz (int) > * Trusted Memory Zone (TMZ) is a method to protect data being written > diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c > index fb62886ae013..6ad384ef61b8 100644 > --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c > +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c > @@ -2209,6 +2209,9 @@ static void update_connector_ext_caps(struct amdgpu_dm_connector *aconnector) > caps->ext_caps->bits.hdr_aux_backlight_control == 1) > caps->aux_support = true; > > + if (amdgpu_aux_backlight >= 0) > + caps->aux_support = amdgpu_aux_backlight; > + > /* From the specification (CTA-861-G), for calculating the maximum > * luminance we need to use: > * Luminance = 50*2**(CV/32) > -- > 2.26.2 > > _______________________________________________ > amd-gfx mailing list > amd-gfx@xxxxxxxxxxxxxxxxxxxxx > https://lists.freedesktop.org/mailman/listinfo/amd-gfx _______________________________________________ amd-gfx mailing list amd-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/amd-gfx
