[Intel-gfx] [PATCH] drm/i915: 4K audio N value incorrect at 29.97 and 23.98 refresh rate

[Ville Syrjälä]

On Wed, Oct 07, 2015 at 02:38:29PM -0700, clinton.a.taylor at intel.com wrote:
> From: Clint Taylor <clinton.a.taylor at intel.com>
> 
> The TMDS_296M define was computing as 296704 but the mode->clock is
> 296700 as defined by EDID. Adjusted define to allow correct detection
> of the need to program the correct N value for 29.97 and 23.98 refresh
> rate.
> 
> Signed-off-by: Clint Taylor <clinton.a.taylor at intel.com>
> ---
>  drivers/gpu/drm/i915/intel_audio.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_audio.c b/drivers/gpu/drm/i915/intel_audio.c
> index 56c2f54..419c979 100644
> --- a/drivers/gpu/drm/i915/intel_audio.c
> +++ b/drivers/gpu/drm/i915/intel_audio.c
> @@ -75,7 +75,7 @@ static const struct {
>  
>  /* HDMI N/CTS table */
>  #define TMDS_297M 297000
> -#define TMDS_296M DIV_ROUND_UP(297000 * 1000, 1001)
> +#define TMDS_296M 296700

Hmm. I think we might want to fix up the mode instead. Let me post a few
patches, and let's see what people think...

>  static const struct {
>  	int sample_rate;
>  	int clock;
> -- 
> 1.7.9.5
> 
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-- 
Ville Syrjälä
Intel OTC