[Intel-gfx] [PATCH] drm/i915: correct intel_dp_get_config() function for DevCPT

[Daniel Vetter]

On Fri, Jun 28, 2013 at 12:59:06PM +0800, Xiong Zhang wrote:
> On DevCPT, the control register for Transcoder DP Sync Polarity is
> TRANS_DP_CTL, not DP_CTL.
> Without this patch, Many call trace occur on CPT machine with DP monitor.
> The call trace is like: *ERROR* mismatch in adjusted_mode.flags(expected X,found X)
> 
> v2: use intel-crtc to simple patch, suggested by Daniel.
> 
> Signed-off-by: Xiong Zhang <xiong.y.zhang at intel.com>

Queued for -next (with some tiny bikeshedding), thanks for the patch.
-Daniel
> ---
>  drivers/gpu/drm/i915/intel_dp.c |   35 +++++++++++++++++++++++++----------
>  1 file changed, 25 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 8708a0c..c3ff8ac 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -1324,20 +1324,35 @@ static void intel_dp_get_config(struct intel_encoder *encoder,
>  				struct intel_crtc_config *pipe_config)
>  {
>  	struct intel_dp *intel_dp = enc_to_intel_dp(&encoder->base);
> -	struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
>  	u32 tmp, flags = 0;
> +	struct drm_device *dev = encoder->base.dev;
> +	struct drm_i915_private *dev_priv = dev->dev_private;
> +	enum port port = dp_to_dig_port(intel_dp)->port;
> +	struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
>  
> -	tmp = I915_READ(intel_dp->output_reg);
> +	if ((port == PORT_A) || !HAS_PCH_CPT(dev)) {
> +		tmp = I915_READ(intel_dp->output_reg);
> +		if (tmp & DP_SYNC_HS_HIGH)
> +			flags |= DRM_MODE_FLAG_PHSYNC;
> +		else
> +			flags |= DRM_MODE_FLAG_NHSYNC;
>  
> -	if (tmp & DP_SYNC_HS_HIGH)
> -		flags |= DRM_MODE_FLAG_PHSYNC;
> -	else
> -		flags |= DRM_MODE_FLAG_NHSYNC;
> +		if (tmp & DP_SYNC_VS_HIGH)
> +			flags |= DRM_MODE_FLAG_PVSYNC;
> +		else
> +			flags |= DRM_MODE_FLAG_NVSYNC;
> +	} else {
> +		tmp = I915_READ(TRANS_DP_CTL(intel_crtc->pipe));
> +		if (tmp & TRANS_DP_HSYNC_ACTIVE_HIGH)
> +			flags |= DRM_MODE_FLAG_PHSYNC;
> +		else
> +			flags |= DRM_MODE_FLAG_NHSYNC;
>  
> -	if (tmp & DP_SYNC_VS_HIGH)
> -		flags |= DRM_MODE_FLAG_PVSYNC;
> -	else
> -		flags |= DRM_MODE_FLAG_NVSYNC;
> +		if (tmp & TRANS_DP_VSYNC_ACTIVE_HIGH)
> +			flags |= DRM_MODE_FLAG_PVSYNC;
> +		else
> +			flags |= DRM_MODE_FLAG_NVSYNC;
> +	}
>  
>  	pipe_config->adjusted_mode.flags |= flags;
>  }
> -- 
> 1.7.9.5
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch