[Intel-gfx] [PATCH 01/12] drm/i915: Grab the pixel clock from adjusted_mode not requested_mode

[Daniel Vetter]

On Mon, Sep 02, 2013 at 09:13:28PM +0300, ville.syrjala at linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> intel_crtc_compute_config() and i9xx_set_pipeconf() attempt to get
> the current pixel clock from requested_mode. requested_mode.clock may
> be totally bogus, so the clock should come from adjusted_mode.
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
>  drivers/gpu/drm/i915/intel_display.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index ecb8b52..cab1319 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -4124,8 +4124,7 @@ static int intel_crtc_compute_config(struct intel_crtc *crtc,
>  
>  	if (HAS_PCH_SPLIT(dev)) {
>  		/* FDI link clock is fixed at 2.7G */
> -		if (pipe_config->requested_mode.clock * 3
> -		    > IRONLAKE_FDI_FREQ * 4)
> +		if (adjusted_mode->clock * 3 > IRONLAKE_FDI_FREQ * 4)

Note quite: The fdi dotclock is the adjusted mode's clock but with the
pixel multiplier _not_ taken into account. See
ironlake_fdi_compute_config. Maybe we need a fdi_dotclock_from_pipe_config
helper function?o

Otoh the ironlake_fdi_compute_config will do the right thing no matter
what and even takes into account things like cpu edp or shared fdi b/c
lanes. So I think we should just ditch this check here ;-)
-Daniel

>  			return -EINVAL;
>  	}
>  
> @@ -4812,7 +4811,7 @@ static void i9xx_set_pipeconf(struct intel_crtc *intel_crtc)
>  		 * XXX: No double-wide on 915GM pipe B. Is that the only reason for the
>  		 * pipe == 0 check?
>  		 */
> -		if (intel_crtc->config.requested_mode.clock >
> +		if (intel_crtc->config.adjusted_mode.clock >
>  		    dev_priv->display.get_display_clock_speed(dev) * 9 / 10)
>  			pipeconf |= PIPECONF_DOUBLE_WIDE;
>  	}
> -- 
> 1.8.1.5
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch