[Intel-gfx] [PATCH v4 2/2] drm/i915: DP link training optimization

[Sivakumar Thulasimani]

Reviewed-by: Sivakumar Thulasimani <sivakumar.thulasimani at intel.com>

On 4/29/2015 11:47 AM, Mika Kahola wrote:
> This patch adds DP link training optimization by reusing the
> previously trained values.
>
> v2:
> - rebase
>
> V3:
> - rebase
>
> V4:
> - when HPD long pulse is received, the flag is cleared
>    that indicates if DP link training is required or not
>    (based on Sivakumar's comment)
>
> Signed-off-by: Mika Kahola <mika.kahola at intel.com>
> ---
>   drivers/gpu/drm/i915/intel_dp.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index e0b35cb..bb1a8d0 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -3794,7 +3794,7 @@ intel_dp_complete_link_train(struct intel_dp *intel_dp)
>   	intel_dp->DP = DP;
>   
>   	if (channel_eq) {
> -		intel_dp->train_set_valid = is_edp(intel_dp);
> +		intel_dp->train_set_valid = true;
>   		DRM_DEBUG_KMS("Channel EQ done. DP Training successful\n");
>   	}
>   }
> @@ -4843,6 +4843,8 @@ intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd)
>   	intel_display_power_get(dev_priv, power_domain);
>   
>   	if (long_hpd) {
> +		/* indicate that we need to restart link training */
> +		intel_dp->train_set_valid = false;
>   
>   		if (HAS_PCH_SPLIT(dev)) {
>   			if (!ibx_digital_port_connected(dev_priv, intel_dig_port))

-- 
regards,
Sivakumar