> -----Original Message-----
> From: Intel-xe <intel-xe-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of Arun R
> Murthy
> Sent: Thursday, September 12, 2024 10:36 AM
> To: intel-xe@xxxxxxxxxxxxxxxxxxxxx; intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> Cc: Murthy, Arun R <arun.r.murthy@xxxxxxxxx>; Srikanth V, NagaVenkata
> <nagavenkata.srikanth.v@xxxxxxxxx>
> Subject: [PATCH 3/3] drm/i915/dp: Include the time taken by AUX Tx for
> timeout
>
> As per DP spec the timeout for LANE_CHANNEL_EQ_DONE is 400ms. But this
Adding where in DP spec example dp2.1 section x.x is a good idea
> timeout value is exclusively for the Aux RD Interval and excludes the time
> consumed for the AUX Tx (i.e reading/writing FFE presets). Add another
> 50ms for these AUX Tx to the 400ms timeout.
Is this something we came up with by trial and error or is this also a part of spec
Regards,
Suraj Kandpal
>
> Signed-off-by: Srikanth V NagaVenkata <nagavenkata.srikanth.v@xxxxxxxxx>
> Signed-off-by: Arun R Murthy <arun.r.murthy@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/display/intel_dp_link_training.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_training.c
> b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
> index ca179bed46ad..b6573934c6dd 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
> @@ -1414,7 +1414,7 @@ intel_dp_128b132b_lane_eq(struct intel_dp
> *intel_dp,
> }
>
> /* Time budget for the LANEx_EQ_DONE Sequence */
> - deadline = jiffies + msecs_to_jiffies_timeout(400);
> + deadline = jiffies + msecs_to_jiffies_timeout(450);
>
> for (try = 0; try < max_tries; try++) {
> fsleep(delay_us);
> --
> 2.25.1
