[Intel-gfx] [PATCH 1/4] drm/i915: Assign hwmode after encoder state readout

[Patrik Jakobsson]

On Thu, Sep 10, 2015 at 06:59:07PM +0300, ville.syrjala at linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> The dotclock is often calculated in encoder .get_config(), so we
> shouldn't copy the adjusted_mode to hwmode until we have read out the
> dotclock.
> 
> Gets rid of some warnings like these:
> [drm:drm_calc_timestamping_constants [drm]] *ERROR* crtc 21: Can't calculate constants, dotclock = 0!
> [drm:i915_get_vblank_timestamp] crtc 0 is disabled
> 
> v2: Steal Maarten's idea to move crtc->mode etc. assignment too

Tested and looks good. Here's a bug fixed by this patch.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=91428

Reviewed-by: Patrik Jakobsson <patrik.jakobsson at linux.intel.com>
> 
> Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> Cc: Patrik Jakobsson <patrik.jakobsson at linux.intel.com>
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
>  drivers/gpu/drm/i915/intel_display.c | 57 +++++++++++++++++++-----------------
>  1 file changed, 30 insertions(+), 27 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index af48c1e..f5673c8 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -15094,33 +15094,6 @@ static void intel_modeset_readout_hw_state(struct drm_device *dev)
>  		crtc->base.state->active = crtc->active;
>  		crtc->base.enabled = crtc->active;
>  
> -		memset(&crtc->base.mode, 0, sizeof(crtc->base.mode));
> -		if (crtc->base.state->active) {
> -			intel_mode_from_pipe_config(&crtc->base.mode, crtc->config);
> -			intel_mode_from_pipe_config(&crtc->base.state->adjusted_mode, crtc->config);
> -			WARN_ON(drm_atomic_set_mode_for_crtc(crtc->base.state, &crtc->base.mode));
> -
> -			/*
> -			 * The initial mode needs to be set in order to keep
> -			 * the atomic core happy. It wants a valid mode if the
> -			 * crtc's enabled, so we do the above call.
> -			 *
> -			 * At this point some state updated by the connectors
> -			 * in their ->detect() callback has not run yet, so
> -			 * no recalculation can be done yet.
> -			 *
> -			 * Even if we could do a recalculation and modeset
> -			 * right now it would cause a double modeset if
> -			 * fbdev or userspace chooses a different initial mode.
> -			 *
> -			 * If that happens, someone indicated they wanted a
> -			 * mode change, which means it's safe to do a full
> -			 * recalculation.
> -			 */
> -			crtc->base.state->mode.private_flags = I915_MODE_FLAG_INHERITED;
> -		}
> -
> -		crtc->base.hwmode = crtc->config->base.adjusted_mode;
>  		readout_plane_state(crtc, to_intel_crtc_state(crtc->base.state));
>  
>  		DRM_DEBUG_KMS("[CRTC:%d] hw state readout: %s\n",
> @@ -15180,6 +15153,36 @@ static void intel_modeset_readout_hw_state(struct drm_device *dev)
>  			      connector->base.name,
>  			      connector->base.encoder ? "enabled" : "disabled");
>  	}
> +
> +	for_each_intel_crtc(dev, crtc) {
> +		crtc->base.hwmode = crtc->config->base.adjusted_mode;
> +
> +		memset(&crtc->base.mode, 0, sizeof(crtc->base.mode));
> +		if (crtc->base.state->active) {
> +			intel_mode_from_pipe_config(&crtc->base.mode, crtc->config);
> +			intel_mode_from_pipe_config(&crtc->base.state->adjusted_mode, crtc->config);
> +			WARN_ON(drm_atomic_set_mode_for_crtc(crtc->base.state, &crtc->base.mode));
> +
> +			/*
> +			 * The initial mode needs to be set in order to keep
> +			 * the atomic core happy. It wants a valid mode if the
> +			 * crtc's enabled, so we do the above call.
> +			 *
> +			 * At this point some state updated by the connectors
> +			 * in their ->detect() callback has not run yet, so
> +			 * no recalculation can be done yet.
> +			 *
> +			 * Even if we could do a recalculation and modeset
> +			 * right now it would cause a double modeset if
> +			 * fbdev or userspace chooses a different initial mode.
> +			 *
> +			 * If that happens, someone indicated they wanted a
> +			 * mode change, which means it's safe to do a full
> +			 * recalculation.
> +			 */
> +			crtc->base.state->mode.private_flags = I915_MODE_FLAG_INHERITED;
> +		}
> +	}
>  }
>  
>  /* Scan out the current hw modeset state,
> -- 
> 2.4.6
>