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drm/bridge: Add 200ms delay to wait FW HPD status stable

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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
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Xin Ji 2023-09-22 17:34:49 +08:00 committed by Robert Foss
parent 61df9ca231
commit 330140d731
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1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/bridge/analogix/anx7625.c
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@ -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)),