[Intel-gfx] [PATCH v3] drm/i915: set minimum CD clock to twice the BCLK.

[Kumar, Abhay]

On 4/17/2018 12:06 PM, Abhay Kumar wrote:
> In glk when device boots with only 1366x768 panel, HDA codec doesn't comeup.
> This result in no audio forever as cdclk is < 96Mhz.
> This change will ensure CD clock to be twice of  BCLK.
>
> v2:
>      - Address comment (Jani)
>      - New design approach
> v3: - Typo fix on top of v1
>
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102937
> Signed-off-by: Abhay Kumar <abhay.kumar at intel.com>
> ---
>   drivers/gpu/drm/i915/intel_cdclk.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_cdclk.c b/drivers/gpu/drm/i915/intel_cdclk.c
> index dc7db8a2caf8..6e93af4a46ea 100644
> --- a/drivers/gpu/drm/i915/intel_cdclk.c
> +++ b/drivers/gpu/drm/i915/intel_cdclk.c
> @@ -2143,7 +2143,7 @@ int intel_crtc_compute_min_cdclk(const struct intel_crtc_state *crtc_state)
>   	/* According to BSpec, "The CD clock frequency must be at least twice
>   	 * the frequency of the Azalia BCLK." and BCLK is 96 MHz by default.
>   	 */
> -	if (crtc_state->has_audio && INTEL_GEN(dev_priv) >= 9)
> +	if (INTEL_GEN(dev_priv) >= 9)
>   		min_cdclk = max(2 * 96000, min_cdclk);
>   
>   	/*
Hi Ville, Jani,

    Since right version of this patch is taking time(doing modeset and 
cdclk bump) as we need to poke sound driver. Can we please get this 
v3(same as v1 with typo fix in comment) version of patch merged.
This works all the time and will unblock Audio and lot of folks. without 
this patch audio card is not getting detected at all and blocking basic 
audio feature.

Regards,
Abhay