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media: tc358743: Add support for 972Mbit/s link freq

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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.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
This commit is contained in:
Dave Stevenson 2025-06-11 19:37:13 +01:00 committed by Hans Verkuil
parent c3021d6a80
commit d8192cc01a
1 changed files with 34 additions and 14 deletions
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48
drivers/media/i2c/tc358743.c
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@ -1993,6 +1993,7 @@ static int tc358743_probe_of(struct tc358743_state *state)
/*
* 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) {
@ -2006,23 +2007,42 @@ static int tc358743_probe_of(struct tc358743_state *state)
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;
fallthrough;
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);