950-0173-media-tc358743-Increase-FIFO-level-to-374.patch

From 4f1be827b5873b2aaa9003a2d38ba6b941ceb66d Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.org>
Date: Wed, 31 Oct 2018 14:56:59 +0000
Subject: [PATCH] media: tc358743: Increase FIFO level to 374.

The existing fixed value of 16 worked for UYVY 720P60 over
2 lanes at 594MHz, or UYVY 1080P60 over 4 lanes. (RGB888
1080P60 needs 6 lanes at 594MHz).
It doesn't allow for lower resolutions to work as the FIFO
underflows.

374 is required for 1080P24-30 UYVY over 2 lanes @ 972Mbit/s, but
>374 means that the FIFO underflows on 1080P50 UYVY over 2 lanes
@ 972Mbit/s.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
---
 drivers/media/i2c/tc358743.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/media/i2c/tc358743.c
+++ b/drivers/media/i2c/tc358743.c
@@ -1946,7 +1946,7 @@ static int tc358743_probe_of(struct tc35
 	state->pdata.ddc5v_delay = DDC5V_DELAY_100_MS;
 	state->pdata.enable_hdcp = false;
 	/* A FIFO level of 16 should be enough for 2-lane 720p60 at 594 MHz. */
-	state->pdata.fifo_level = 16;
+	state->pdata.fifo_level = 374;
 	/*
 	 * The PLL input clock is obtained by dividing refclk by pll_prd.
 	 * It must be between 6 MHz and 40 MHz, lower frequency is better.