Unverified Commit 330140d7 authored by Xin Ji's avatar Xin Ji Committed by Robert Foss
Browse files

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: default avatarXin Ji <xji@analogixsemi.com>
Reviewed-by: default avatarRobert Foss <rfoss@kernel.org>
Signed-off-by: default avatarRobert Foss <rfoss@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230922093450.3574349-1-xji@analogixsemi.com
parent 61df9ca2

drivers/gpu/drm/bridge/analogix/anx7625.c

+3 −0
Original line number Diff line number Diff line
@@ -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)),