[PATCH] drm/i915/hdcp: Add additional R0' wait

[Ramalingam C]

On 2020-05-19 at 18:16:21 -0400, Sean Paul wrote:
> From: Sean Paul <seanpaul at chromium.org>
> 
> We're seeing some R0' mismatches in the field, particularly with
I think you want to say Vprime verification? delay is added in between
the retry for vprime verfication.

-Ram
> repeaters. I'm guessing the (already lenient) 300ms wait time isn't
> enough for some setups. So add an additional wait when R0' is
> mismatched.
> 
> Signed-off-by: Sean Paul <seanpaul at chromium.org>
> ---
>  drivers/gpu/drm/i915/display/intel_hdcp.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c
> index 2cbc4619b4ce..924a717a4fa4 100644
> --- a/drivers/gpu/drm/i915/display/intel_hdcp.c
> +++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
> @@ -592,6 +592,9 @@ int intel_hdcp_auth_downstream(struct intel_connector *connector)
>  						  bstatus);
>  		if (!ret)
>  			break;
> +
> +		/* Maybe the sink is lazy, give it some more time */
> +		usleep_range(10000, 50000);
>  	}
>  
>  	if (i == tries) {
> -- 
> Sean Paul, Software Engineer, Google / Chromium OS
>