[Intel-gfx] [PATCH v2 23/49] drm/i915/bxt: Increase DDI buf idle timeout

[Jani Nikula]

On Fri, 27 Mar 2015, Imre Deak <imre.deak at intel.com> wrote:
> From: Vandana Kannan <vandana.kannan at intel.com>
>
> For BXT, DDI buf idle timeout delay needs to be increased to 16us.
>
> Since this is a timeout value and we return as soon as the condition is
> realized, no penalty incurred for other platforms.
>
> v2:
> - remove TIMEOUT macro used only at a single place (Daniel)
>
> Suggested-by: Satheeshakrishna M <satheeshakrishna.m at intel.com>
> Cc: Satheeshakrishna M <satheeshakrishna.m at intel.com>
> Cc: Damien Lespiau <damien.lespiau at intel.com>
> Signed-off-by: Vandana Kannan <vandana.kannan at intel.com>
> Signed-off-by: Damien Lespiau <damien.lespiau at intel.com> (v1)

Might have a comment about bxt vs. others in there, but either way,

Reviewed-by: Jani Nikula <jani.nikula at intel.com>


> ---
>  drivers/gpu/drm/i915/intel_ddi.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index 8aee7d7..e24cd6f 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -322,7 +322,7 @@ static void intel_wait_ddi_buf_idle(struct drm_i915_private *dev_priv,
>  	uint32_t reg = DDI_BUF_CTL(port);
>  	int i;
>  
> -	for (i = 0; i < 8; i++) {
> +	for (i = 0; i < 16; i++) {
>  		udelay(1);
>  		if (I915_READ(reg) & DDI_BUF_IS_IDLE)
>  			return;
> -- 
> 2.1.0
>
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-- 
Jani Nikula, Intel Open Source Technology Center