diff options
| author | Xin Ji <xji@analogixsemi.com> | 2023-09-22 12:34:49 +0300 |
|---|---|---|
| committer | Robert Foss <rfoss@kernel.org> | 2023-09-25 13:45:43 +0300 |
| commit | 330140d7319fcc4ec68bd924ea212e476bf12275 (patch) | |
| tree | 8d90c02e64be3258a0db250a681c30a9b092144d | |
| parent | 61df9ca231075e7031ed3dcf8b9986dfd80050f6 (diff) | |
| download | linux-330140d7319fcc4ec68bd924ea212e476bf12275.tar.xz | |
drm/bridge: Add 200ms delay to wait FW HPD status stable
For the no-interrupt design (sink device is panel, polling HPD
status when chip power on), anx7625 FW has more than 200ms HPD
de-bounce time in FW, for the safety to get HPD status, driver
better to wait 200ms before HPD detection after OS resume back.
Signed-off-by: Xin Ji <xji@analogixsemi.com>
Reviewed-by: Robert Foss <rfoss@kernel.org>
Signed-off-by: Robert Foss <rfoss@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230922093450.3574349-1-xji@analogixsemi.com
| -rw-r--r-- | drivers/gpu/drm/bridge/analogix/anx7625.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c index 51abe42c639e..8f740154707d 100644 --- a/drivers/gpu/drm/bridge/analogix/anx7625.c +++ b/drivers/gpu/drm/bridge/analogix/anx7625.c @@ -1464,6 +1464,9 @@ static int _anx7625_hpd_polling(struct anx7625_data *ctx, if (ctx->pdata.intp_irq) return 0; + /* Delay 200ms for FW HPD de-bounce */ + msleep(200); + ret = readx_poll_timeout(anx7625_read_hpd_status_p0, ctx, val, ((val & HPD_STATUS) || (val < 0)), |