On Fri, 2018-05-11 at 18:03 +0000, Souza, Jose wrote:
On Thu, 2018-05-10 at 17:54 -0700, Dhinakaran Pandiyan wrote:
Entry corresponding to 220 us setup time was missing. I am not aware of any specific bug this fixes, but this could potentially result in enabling PSR on a panel with a higher setup time requirement than supported by the hardware.
It should be 'a lower setup time'. Sink sets 2h requesting 220us but source will only wait 165us.
By hardware, I meant source :) We'll end up enabling PSR on a sink with a higher setup time requirement (220us) than supported by the source hardware (let's say 200 us) because we read the sink requirement as 165 us.
Other than that looks good: Reviewed-by: José Roberto de Souza jose.souza@intel.com
Thanks!
I'll resend this along the other PSR patch you reviewed.
I verified the value is present in eDP spec versions 1.3, 1.4 and 1.4a.
Fixes: 6608804b3d7f ("drm/dp: Add drm_dp_psr_setup_time()") Cc: stable@vger.kernel.org Cc: Ville Syrjälä ville.syrjala@linux.intel.com Cc: Jose Roberto de Souza jose.souza@intel.com Signed-off-by: Dhinakaran Pandiyan dhinakaran.pandiyan@intel.com
drivers/gpu/drm/drm_dp_helper.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index 36c7609a4bd5..a7ba602a43a8 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -1159,6 +1159,7 @@ int drm_dp_psr_setup_time(const u8 psr_cap[EDP_PSR_RECEIVER_CAP_SIZE]) static const u16 psr_setup_time_us[] = { PSR_SETUP_TIME(330), PSR_SETUP_TIME(275),
PSR_SETUP_TIME(220),PSR_SETUP_TIME(165), PSR_SETUP_TIME(110), PSR_SETUP_TIME(55),