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From 216cd49e1af96bc615a36cddfad7b5a05e1f7ca2 Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.org>
Date: Wed, 31 Oct 2018 14:57:21 +0000
Subject: [PATCH] media: tc358743: Add support for 972Mbit/s link freq.
Adds register setups for running the CSI lanes at 972Mbit/s,
which allows 1080P50 UYVY down 2 lanes.
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
---
drivers/media/i2c/tc358743.c | 47 +++++++++++++++++++++++++-----------
1 file changed, 33 insertions(+), 14 deletions(-)
--- a/drivers/media/i2c/tc358743.c
+++ b/drivers/media/i2c/tc358743.c
@@ -1979,6 +1979,7 @@ static int tc358743_probe_of(struct tc35
/*
* The CSI bps per lane must be between 62.5 Mbps and 1 Gbps.
* The default is 594 Mbps for 4-lane 1080p60 or 2-lane 720p60.
+ * 972 Mbps allows 1080P50 UYVY over 2-lane.
*/
bps_pr_lane = 2 * endpoint.link_frequencies[0];
if (bps_pr_lane < 62500000U || bps_pr_lane > 1000000000U) {
@@ -1992,23 +1993,41 @@ static int tc358743_probe_of(struct tc35
state->pdata.refclk_hz * state->pdata.pll_prd;
/*
- * FIXME: These timings are from REF_02 for 594 Mbps per lane (297 MHz
- * link frequency). In principle it should be possible to calculate
+ * FIXME: These timings are from REF_02 for 594 or 972 Mbps per lane
+ * (297 MHz or 486 MHz link frequency).
+ * In principle it should be possible to calculate
* them based on link frequency and resolution.
*/
- if (bps_pr_lane != 594000000U)
+ switch (bps_pr_lane) {
+ default:
dev_warn(dev, "untested bps per lane: %u bps\n", bps_pr_lane);
- state->pdata.lineinitcnt = 0xe80;
- state->pdata.lptxtimecnt = 0x003;
- /* tclk-preparecnt: 3, tclk-zerocnt: 20 */
- state->pdata.tclk_headercnt = 0x1403;
- state->pdata.tclk_trailcnt = 0x00;
- /* ths-preparecnt: 3, ths-zerocnt: 1 */
- state->pdata.ths_headercnt = 0x0103;
- state->pdata.twakeup = 0x4882;
- state->pdata.tclk_postcnt = 0x008;
- state->pdata.ths_trailcnt = 0x2;
- state->pdata.hstxvregcnt = 0;
+ case 594000000U:
+ state->pdata.lineinitcnt = 0xe80;
+ state->pdata.lptxtimecnt = 0x003;
+ /* tclk-preparecnt: 3, tclk-zerocnt: 20 */
+ state->pdata.tclk_headercnt = 0x1403;
+ state->pdata.tclk_trailcnt = 0x00;
+ /* ths-preparecnt: 3, ths-zerocnt: 1 */
+ state->pdata.ths_headercnt = 0x0103;
+ state->pdata.twakeup = 0x4882;
+ state->pdata.tclk_postcnt = 0x008;
+ state->pdata.ths_trailcnt = 0x2;
+ state->pdata.hstxvregcnt = 0;
+ break;
+ case 972000000U:
+ state->pdata.lineinitcnt = 0x1b58;
+ state->pdata.lptxtimecnt = 0x007;
+ /* tclk-preparecnt: 6, tclk-zerocnt: 40 */
+ state->pdata.tclk_headercnt = 0x2806;
+ state->pdata.tclk_trailcnt = 0x00;
+ /* ths-preparecnt: 6, ths-zerocnt: 8 */
+ state->pdata.ths_headercnt = 0x0806;
+ state->pdata.twakeup = 0x4268;
+ state->pdata.tclk_postcnt = 0x008;
+ state->pdata.ths_trailcnt = 0x5;
+ state->pdata.hstxvregcnt = 0;
+ break;
+ }
state->reset_gpio = devm_gpiod_get_optional(dev, "reset",
GPIOD_OUT_LOW);
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