target/linux/layerscape/patches-5.4/805-display-0057-LF-794-4-gpu-cdn-mhdp-common-Increase-the-check-aliv.patch

   1 From 5a019410a0908d7a66a0526a47bed1883c02c5fe Mon Sep 17 00:00:00 2001
   2 From: Abel Vesa <abel.vesa@nxp.com>
   3 Date: Thu, 9 Jan 2020 15:20:27 +0200
   4 Subject: [PATCH] LF-794-4 gpu: cdn: mhdp-common: Increase the check alive
   5  timeout
   6
   7 It seems that the firmware on i.MX8QM starts a little bit
   8 after 20us after the ucpu has been relased (un-resetted).
   9 Therefore, increase the max timeout for check alive to 50us.
  10
  11 Signed-off-by: Abel Vesa <abel.vesa@nxp.com>
  12 Reviewed-by: Sandor Yu <sandor.yu@nxp.com>
  13 Acked-by: Wen He <wen.he_1@nxp.com>
  14 Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
  15 ---
  16  drivers/gpu/drm/bridge/cadence/cdns-mhdp-common.c | 2 +-
  17  1 file changed, 1 insertion(+), 1 deletion(-)
  18
  19 --- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp-common.c
  20 +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp-common.c
  21 @@ -1039,7 +1039,7 @@ EXPORT_SYMBOL(cdns_mhdp_read_hpd);
  22  bool cdns_mhdp_check_alive(struct cdns_mhdp_device *mhdp)
  23  {
  24         u32  alive, newalive;
  25 -       u8 retries_left = 10;
  26 +       u8 retries_left = 50;
  27
  28         alive = cdns_mhdp_bus_read(mhdp, KEEP_ALIVE);
  29