On Mon, 24 Oct 2016, Imre Deak <[email protected]> wrote:
> All types of DP devices (eDP, DP sink, DP branch) will fail their probe
> if the start of DPCD can't be read. The LSPCON PCON functionality also
> depends on accessing this area, so fail the probe if the read fails.
>
> Cc: Shashank Sharma <[email protected]>
> Signed-off-by: Imre Deak <[email protected]>

Reviewed-by: Jani Nikula <[email protected]>


> ---
>  drivers/gpu/drm/i915/intel_dp.c     | 2 +-
>  drivers/gpu/drm/i915/intel_drv.h    | 2 ++
>  drivers/gpu/drm/i915/intel_lspcon.c | 5 +++++
>  3 files changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 726fdf2..62c5512 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -3495,7 +3495,7 @@ intel_dp_link_down(struct intel_dp *intel_dp)
>       intel_dp->DP = DP;
>  }
>  
> -static bool
> +bool
>  intel_dp_read_dpcd(struct intel_dp *intel_dp)
>  {
>       if (drm_dp_dpcd_read(&intel_dp->aux, 0x000, intel_dp->dpcd,
> diff --git a/drivers/gpu/drm/i915/intel_drv.h 
> b/drivers/gpu/drm/i915/intel_drv.h
> index 4c9f953..ff9d2dc 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -1461,6 +1461,8 @@ static inline unsigned int 
> intel_dp_unused_lane_mask(int lane_count)
>       return ~((1 << lane_count) - 1) & 0xf;
>  }
>  
> +bool intel_dp_read_dpcd(struct intel_dp *intel_dp);
> +
>  /* intel_dp_aux_backlight.c */
>  int intel_dp_aux_init_backlight_funcs(struct intel_connector 
> *intel_connector);
>  
> diff --git a/drivers/gpu/drm/i915/intel_lspcon.c 
> b/drivers/gpu/drm/i915/intel_lspcon.c
> index 632149c..23b817a 100644
> --- a/drivers/gpu/drm/i915/intel_lspcon.c
> +++ b/drivers/gpu/drm/i915/intel_lspcon.c
> @@ -131,6 +131,11 @@ bool lspcon_init(struct intel_digital_port 
> *intel_dig_port)
>               }
>       }
>  
> +     if (!intel_dp_read_dpcd(dp)) {
> +             DRM_ERROR("LSPCON DPCD read failed\n");
> +             return false;
> +     }
> +
>       DRM_DEBUG_KMS("Success: LSPCON init\n");
>       return true;
>  }

-- 
Jani Nikula, Intel Open Source Technology Center
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