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
(cherry picked from commit 330140d)

Author: Xin-ANX

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

@@ -1485,6 +1485,9 @@ 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)),