[Intel-gfx] [PATCH] drm/i915: Add missing HDMI audio pixel clocks for gen12

[Ville Syrjälä]

On Mon, Jan 27, 2020 at 01:39:09PM +0200, Kai Vehmanen wrote:
> Gen12 hardware supports HDMI audio pixel clocks of 296.7/297Mhz
> and 593.4/594Mhz. Add the missing rates and add logic to ignore
> them if running on older hardware.
> 
> Bspec: 49333
> Signed-off-by: Kai Vehmanen <kai.vehmanen at linux.intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_audio.c | 16 +++++++++++++---
>  drivers/gpu/drm/i915/i915_reg.h            |  4 ++++
>  2 files changed, 17 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_audio.c b/drivers/gpu/drm/i915/display/intel_audio.c
> index b18040793d9e..78f744d220da 100644
> --- a/drivers/gpu/drm/i915/display/intel_audio.c
> +++ b/drivers/gpu/drm/i915/display/intel_audio.c
> @@ -148,6 +148,10 @@ static const struct {
>  	{ 74250, AUD_CONFIG_PIXEL_CLOCK_HDMI_74250 },
>  	{ 148352, AUD_CONFIG_PIXEL_CLOCK_HDMI_148352 },
>  	{ 148500, AUD_CONFIG_PIXEL_CLOCK_HDMI_148500 },
> +	{ 296703, AUD_CONFIG_PIXEL_CLOCK_HDMI_296703 },
> +	{ 297000, AUD_CONFIG_PIXEL_CLOCK_HDMI_297000 },
> +	{ 593407, AUD_CONFIG_PIXEL_CLOCK_HDMI_593407 },
> +	{ 594000, AUD_CONFIG_PIXEL_CLOCK_HDMI_594000 },
>  };
>  
>  /* HDMI N/CTS table */
> @@ -231,13 +235,19 @@ static const struct hdmi_aud_ncts hdmi_aud_ncts_36bpp[] = {
>  };
>  
>  /* get AUD_CONFIG_PIXEL_CLOCK_HDMI_* value for mode */
> -static u32 audio_config_hdmi_pixel_clock(const struct intel_crtc_state *crtc_state)
> +static u32 audio_config_hdmi_pixel_clock(struct drm_i915_private *dev_priv,
> +					 const struct intel_crtc_state *crtc_state)
>  {
>  	const struct drm_display_mode *adjusted_mode =
>  		&crtc_state->hw.adjusted_mode;
>  	int i;
>  
>  	for (i = 0; i < ARRAY_SIZE(hdmi_audio_clock); i++) {
> +		if (INTEL_GEN(dev_priv) < 12 &&
> +		    hdmi_audio_clock[i].clock > 148500) {

Might be cleaner to do the check after the loop.

Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

> +			i = ARRAY_SIZE(hdmi_audio_clock);
> +			break;
> +		}
>  		if (adjusted_mode->crtc_clock == hdmi_audio_clock[i].clock)
>  			break;
>  	}
> @@ -433,7 +443,7 @@ hsw_hdmi_audio_config_update(struct intel_encoder *encoder,
>  	tmp &= ~AUD_CONFIG_N_VALUE_INDEX;
>  	tmp &= ~AUD_CONFIG_PIXEL_CLOCK_HDMI_MASK;
>  	tmp &= ~AUD_CONFIG_N_PROG_ENABLE;
> -	tmp |= audio_config_hdmi_pixel_clock(crtc_state);
> +	tmp |= audio_config_hdmi_pixel_clock(dev_priv, crtc_state);
>  
>  	n = audio_config_hdmi_get_n(crtc_state, rate);
>  	if (n != 0) {
> @@ -673,7 +683,7 @@ static void ilk_audio_codec_enable(struct intel_encoder *encoder,
>  	if (intel_crtc_has_dp_encoder(crtc_state))
>  		tmp |= AUD_CONFIG_N_VALUE_INDEX;
>  	else
> -		tmp |= audio_config_hdmi_pixel_clock(crtc_state);
> +		tmp |= audio_config_hdmi_pixel_clock(dev_priv, crtc_state);
>  	I915_WRITE(aud_config, tmp);
>  }
>  
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 6cc55c103f67..61d9d045b2ff 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -9241,6 +9241,10 @@ enum {
>  #define   AUD_CONFIG_PIXEL_CLOCK_HDMI_74250	(7 << 16)
>  #define   AUD_CONFIG_PIXEL_CLOCK_HDMI_148352	(8 << 16)
>  #define   AUD_CONFIG_PIXEL_CLOCK_HDMI_148500	(9 << 16)
> +#define   AUD_CONFIG_PIXEL_CLOCK_HDMI_296703	(10 << 16)
> +#define   AUD_CONFIG_PIXEL_CLOCK_HDMI_297000	(11 << 16)
> +#define   AUD_CONFIG_PIXEL_CLOCK_HDMI_593407	(12 << 16)
> +#define   AUD_CONFIG_PIXEL_CLOCK_HDMI_594000	(13 << 16)
>  #define   AUD_CONFIG_DISABLE_NCTS		(1 << 3)
>  
>  /* HSW Audio */
> -- 
> 2.17.1
> 
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-- 
Ville Syrjälä
Intel