[Intel-gfx] [PATCH 1/2] drm/dp: Add defines for latency in sink

[Rodrigo Vivi]

On Mon, Sep 25, 2017 at 09:01:38AM +0000, vathsala nagaraju wrote:
> On Monday 25 September 2017 01:53 PM, Jani Nikula wrote:
> 
>     On Sat, 23 Sep 2017, vathsala nagaraju <vathsala.nagaraju at intel.com> wrote:
> 
>         Add defines for dpcd register 2009 (synchronization latency
>         in sink).
> 
>         Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
>         CC: Puthikorn Voravootivat <puthik at chromium.org>
>         Reviewed-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
>         Signed-off-by: Vathsala Nagaraju <vathsala.nagaraju at intel.com>
>         ---
>          include/drm/drm_dp_helper.h | 3 +++
>          1 file changed, 3 insertions(+)
> 
>         diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
>         index 11c39f1..846004e6 100644
>         --- a/include/drm/drm_dp_helper.h
>         +++ b/include/drm/drm_dp_helper.h
>         @@ -735,6 +735,9 @@
>          # define DP_PSR_SINK_INTERNAL_ERROR         7
>          # define DP_PSR_SINK_STATE_MASK             0x07
> 
>         +#define DP_SINK_SYNCHRONIZATION_LATENCY            0x2009
>         +# define DP_MAX_RESYNC_FRAME_CNT_MASK      0xf
> 
>     For the DP spec, please don't invent the names, use the ones from the
>     spec. At most drop excess stuff from the end.
> 
> In edp 1.4b spec , the register name 2009 is "DEBUG 0 SYNCHRONIZATION LATENCY SINK "  and
> bit 0:3 "MAX RE-SYNC FRAME COUNT"

probably he meant something like:

# define DP_SYNCHRONIZATION_LATENCY_IN_SINK            0x2009
# define DP_MAX_RESYNC_FRAME_COUNT_MASK      0xf

but he is the best one to confirm that...

> 
> 
>     #define DP_SYNCHRONIZATION_LATENCY_IN_SINK
>     # define DP_MAX_RESYNC_FRAME_COUNT_SHIFT
>     # define DP_MAX_RESYNC_FRAME_COUNT_MASK
> 
>     And while at it, please add the full register contents.
> 
>     BR,
>     Jani.
> 
> 
>         +
>          #define DP_RECEIVER_ALPM_STATUS                    0x200b  /* eDP 1.4 */
>          # define DP_ALPM_LOCK_TIMEOUT_ERROR        (1 << 0)
> 
>