On Tue, Apr 5, 2022 at 5:07 AM Grigory Vasilyev h0tc0d3@gmail.com wrote:

Variable igp_lane_info always is 0. 0 & any value = 0 and false. In this way, all сonditional statements will false. Therefore, it is not clear what this code does.

It was leftover from when the code was ported from radeon. The igp lane info was available from the vbios on older APUs. It's not relevant on any asics supported by amdgpu. I've applied the patch and clarified the commit message.

Thanks,

Alex

Signed-off-by: Grigory Vasilyev h0tc0d3@gmail.com

.../gpu/drm/amd/amdgpu/atombios_encoders.c | 21 ------------------- 1 file changed, 21 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/atombios_encoders.c b/drivers/gpu/drm/amd/amdgpu/atombios_encoders.c index 2b0cc793291c..100bad2f5901 100644 --- a/drivers/gpu/drm/amd/amdgpu/atombios_encoders.c +++ b/drivers/gpu/drm/amd/amdgpu/atombios_encoders.c @@ -769,7 +769,6 @@ amdgpu_atombios_encoder_setup_dig_transmitter(struct drm_encoder *encoder, int a int dp_clock = 0; int dp_lane_count = 0; int connector_object_id = 0;

•   int igp_lane_info = 0;
    int dig_encoder = dig->dig_encoder;
    int hpd_id = AMDGPU_HPD_NONE;
  
  

@@ -852,26 +851,6 @@ amdgpu_atombios_encoder_setup_dig_transmitter(struct drm_encoder *encoder, int a else args.v1.ucConfig |= ATOM_TRANSMITTER_CONFIG_DIG1_ENCODER;

•                   if ((adev->flags & AMD_IS_APU) &&
  

•                       (amdgpu_encoder->encoder_id == ENCODER_OBJECT_ID_INTERNAL_UNIPHY)) {
  

•                           if (is_dp ||
  

•                               !amdgpu_dig_monitor_is_duallink(encoder, amdgpu_encoder->pixel_clock)) {
  

•                                   if (igp_lane_info & 0x1)
  

•                                           args.v1.ucConfig |= ATOM_TRANSMITTER_CONFIG_LANE_0_3;
  

•                                   else if (igp_lane_info & 0x2)
  

•                                           args.v1.ucConfig |= ATOM_TRANSMITTER_CONFIG_LANE_4_7;
  

•                                   else if (igp_lane_info & 0x4)
  

•                                           args.v1.ucConfig |= ATOM_TRANSMITTER_CONFIG_LANE_8_11;
  

•                                   else if (igp_lane_info & 0x8)
  

•                                           args.v1.ucConfig |= ATOM_TRANSMITTER_CONFIG_LANE_12_15;
  

•                           } else {
  

•                                   if (igp_lane_info & 0x3)
  

•                                           args.v1.ucConfig |= ATOM_TRANSMITTER_CONFIG_LANE_0_7;
  

•                                   else if (igp_lane_info & 0xc)
  

•                                           args.v1.ucConfig |= ATOM_TRANSMITTER_CONFIG_LANE_8_15;
  

•                           }
  

•                   }
  

•                   if (dig->linkb)
                            args.v1.ucConfig |= ATOM_TRANSMITTER_CONFIG_LINKB;
                    else
  

-- 2.35.1