Re: [PATCH v5 2/2] drm/i915: State readout and cross-checking for dp_m2_n2

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Hi Daniel,

Please let me know if this patch
(http://lists.freedesktop.org/archives/intel-gfx/2014-May/045877.html)
and the patch
http://lists.freedesktop.org/archives/intel-gfx/2014-May/045804.html
require any other changes..
I have included all your review comments till date..

Thanks,
Vandana

On May-22-2014 12:18 PM, Kannan, Vandana wrote:
> Adding relevant read out comparison code, in check_crtc_state, for the new
> member of crtc_config, dp_m2_n2, which was introduced to store link_m_n
> values for a DP downclock mode (if available). Suggested by Daniel.
> 
> v2: Changed patch title.
> Daniel's review comments incorporated.
> Added relevant state readout code for M2_N2. dp_m2_n2 comparison to be done
> only when high RR is not in use (This is because alternate m_n register
> programming will be done only when low RR is being used).
> 
> v3: Modified call to get_m2_n2 which had dp_m_n as param by mistake.
> Compare dp_m_n and dp_m2_n2 for gen 7 and below. compare the structures
> based on DRRS state for gen 8 and above.
> Save and restore M2 N2 registers for gen 7 and below
> 
> v4: For Gen>=8, check M_N registers against dp_m_n and dp_m2_n2 as there is
> only one set of M_N registers
> 
> v5: Removed the chunk which saves and restores M2_N2 registers. Modified
> get_m_n() to get M2_N2 registers as well. Modified the macro which compares
> hw.dp_m_n against sw.dp_m2_n2/sw.dp_m_n for gen > 8.
> 
> Signed-off-by: Vandana Kannan <vandana.kannan@xxxxxxxxx>
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
> ---
>  drivers/gpu/drm/i915/intel_display.c | 68 +++++++++++++++++++++++++++++++-----
>  1 file changed, 60 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index cf3ad87..d593897 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -6945,7 +6945,8 @@ static void intel_pch_transcoder_get_m_n(struct intel_crtc *crtc,
>  
>  static void intel_cpu_transcoder_get_m_n(struct intel_crtc *crtc,
>  					 enum transcoder transcoder,
> -					 struct intel_link_m_n *m_n)
> +					 struct intel_link_m_n *m_n,
> +					 struct intel_link_m_n *m2_n2)
>  {
>  	struct drm_device *dev = crtc->base.dev;
>  	struct drm_i915_private *dev_priv = dev->dev_private;
> @@ -6959,6 +6960,15 @@ static void intel_cpu_transcoder_get_m_n(struct intel_crtc *crtc,
>  		m_n->gmch_n = I915_READ(PIPE_DATA_N1(transcoder));
>  		m_n->tu = ((I915_READ(PIPE_DATA_M1(transcoder))
>  			    & TU_SIZE_MASK) >> TU_SIZE_SHIFT) + 1;
> +		if (m2_n2 && INTEL_INFO(dev)->gen < 8) {
> +			m2_n2->link_m = I915_READ(PIPE_LINK_M2(transcoder));
> +			m2_n2->link_n =	I915_READ(PIPE_LINK_N2(transcoder));
> +			m2_n2->gmch_m =	I915_READ(PIPE_DATA_M2(transcoder))
> +					& ~TU_SIZE_MASK;
> +			m2_n2->gmch_n =	I915_READ(PIPE_DATA_N2(transcoder));
> +			m2_n2->tu = ((I915_READ(PIPE_DATA_M2(transcoder))
> +					& TU_SIZE_MASK) >> TU_SIZE_SHIFT) + 1;
> +		}
>  	} else {
>  		m_n->link_m = I915_READ(PIPE_LINK_M_G4X(pipe));
>  		m_n->link_n = I915_READ(PIPE_LINK_N_G4X(pipe));
> @@ -6977,14 +6987,15 @@ void intel_dp_get_m_n(struct intel_crtc *crtc,
>  		intel_pch_transcoder_get_m_n(crtc, &pipe_config->dp_m_n);
>  	else
>  		intel_cpu_transcoder_get_m_n(crtc, pipe_config->cpu_transcoder,
> -					     &pipe_config->dp_m_n);
> +					     &pipe_config->dp_m_n,
> +					     &pipe_config->dp_m2_n2);
>  }
>  
>  static void ironlake_get_fdi_m_n_config(struct intel_crtc *crtc,
>  					struct intel_crtc_config *pipe_config)
>  {
>  	intel_cpu_transcoder_get_m_n(crtc, pipe_config->cpu_transcoder,
> -				     &pipe_config->fdi_m_n);
> +				     &pipe_config->fdi_m_n, NULL);
>  }
>  
>  static void ironlake_get_pfit_config(struct intel_crtc *crtc,
> @@ -9485,6 +9496,15 @@ static void intel_dump_pipe_config(struct intel_crtc *crtc,
>  		      pipe_config->dp_m_n.gmch_m, pipe_config->dp_m_n.gmch_n,
>  		      pipe_config->dp_m_n.link_m, pipe_config->dp_m_n.link_n,
>  		      pipe_config->dp_m_n.tu);
> +
> +	DRM_DEBUG_KMS("dp: %i, gmch_m2: %u, gmch_n2: %u, link_m2: %u, link_n2: %u, tu2: %u\n",
> +		      pipe_config->has_dp_encoder,
> +		      pipe_config->dp_m2_n2.gmch_m,
> +		      pipe_config->dp_m2_n2.gmch_n,
> +		      pipe_config->dp_m2_n2.link_m,
> +		      pipe_config->dp_m2_n2.link_n,
> +		      pipe_config->dp_m2_n2.tu);
> +
>  	DRM_DEBUG_KMS("requested mode:\n");
>  	drm_mode_debug_printmodeline(&pipe_config->requested_mode);
>  	DRM_DEBUG_KMS("adjusted mode:\n");
> @@ -9867,6 +9887,22 @@ intel_pipe_config_compare(struct drm_device *dev,
>  		return false; \
>  	}
>  
> +/* This is required for BDW+ where there is only one set of registers for
> + * switching between high and low RR.
> + * This macro can be used whenever a comparison has to be made between one
> + * hw state and multiple sw state variables.
> + */
> +#define PIPE_CONF_CHECK_I_ALT(name, alt_name) \
> +	if ((current_config->name != pipe_config->name) && \
> +		(current_config->alt_name != pipe_config->name)) { \
> +			DRM_ERROR("mismatch in " #name " " \
> +				  "(expected %i or %i, found %i)\n", \
> +				  current_config->name, \
> +				  current_config->alt_name, \
> +				  pipe_config->name); \
> +			return false; \
> +	}
> +
>  #define PIPE_CONF_CHECK_FLAGS(name, mask)	\
>  	if ((current_config->name ^ pipe_config->name) & (mask)) { \
>  		DRM_ERROR("mismatch in " #name "(" #mask ") "	   \
> @@ -9899,11 +9935,26 @@ intel_pipe_config_compare(struct drm_device *dev,
>  	PIPE_CONF_CHECK_I(fdi_m_n.tu);
>  
>  	PIPE_CONF_CHECK_I(has_dp_encoder);
> -	PIPE_CONF_CHECK_I(dp_m_n.gmch_m);
> -	PIPE_CONF_CHECK_I(dp_m_n.gmch_n);
> -	PIPE_CONF_CHECK_I(dp_m_n.link_m);
> -	PIPE_CONF_CHECK_I(dp_m_n.link_n);
> -	PIPE_CONF_CHECK_I(dp_m_n.tu);
> +
> +	if (INTEL_INFO(dev)->gen < 8) {
> +		PIPE_CONF_CHECK_I(dp_m_n.gmch_m);
> +		PIPE_CONF_CHECK_I(dp_m_n.gmch_n);
> +		PIPE_CONF_CHECK_I(dp_m_n.link_m);
> +		PIPE_CONF_CHECK_I(dp_m_n.link_n);
> +		PIPE_CONF_CHECK_I(dp_m_n.tu);
> +
> +		PIPE_CONF_CHECK_I(dp_m2_n2.gmch_m);
> +		PIPE_CONF_CHECK_I(dp_m2_n2.gmch_n);
> +		PIPE_CONF_CHECK_I(dp_m2_n2.link_m);
> +		PIPE_CONF_CHECK_I(dp_m2_n2.link_n);
> +		PIPE_CONF_CHECK_I(dp_m2_n2.tu);
> +	} else {
> +		PIPE_CONF_CHECK_I_ALT(dp_m_n.gmch_m, dp_m2_n2.gmch_m);
> +		PIPE_CONF_CHECK_I_ALT(dp_m_n.gmch_n, dp_m2_n2.gmch_n);
> +		PIPE_CONF_CHECK_I_ALT(dp_m_n.link_m, dp_m2_n2.link_m);
> +		PIPE_CONF_CHECK_I_ALT(dp_m_n.link_n, dp_m2_n2.link_n);
> +		PIPE_CONF_CHECK_I_ALT(dp_m_n.tu, dp_m2_n2.tu);
> +	}
>  
>  	PIPE_CONF_CHECK_I(adjusted_mode.crtc_hdisplay);
>  	PIPE_CONF_CHECK_I(adjusted_mode.crtc_htotal);
> @@ -9980,6 +10031,7 @@ intel_pipe_config_compare(struct drm_device *dev,
>  
>  #undef PIPE_CONF_CHECK_X
>  #undef PIPE_CONF_CHECK_I
> +#undef PIPE_CONF_CHECK_I_ALT
>  #undef PIPE_CONF_CHECK_FLAGS
>  #undef PIPE_CONF_CHECK_CLOCK_FUZZY
>  #undef PIPE_CONF_QUIRK
> 

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