target/linux/bcm27xx/patches-5.4/950-0155-media-tc358743-Add-support-for-972Mbit-s-link-freq.patch

   1 From 9a379dd76a0369c09f1b613bdd869b6b0354a0f3 Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.org>
   3 Date: Wed, 31 Oct 2018 14:57:21 +0000
   4 Subject: [PATCH] media: tc358743: Add support for 972Mbit/s link freq.
   5
   6 Adds register setups for running the CSI lanes at 972Mbit/s,
   7 which allows 1080P50 UYVY down 2 lanes.
   8
   9 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
  10 ---
  11  drivers/media/i2c/tc358743.c | 47 +++++++++++++++++++++++++-----------
  12  1 file changed, 33 insertions(+), 14 deletions(-)
  13
  14 --- a/drivers/media/i2c/tc358743.c
  15 +++ b/drivers/media/i2c/tc358743.c
  16 @@ -1976,6 +1976,7 @@ static int tc358743_probe_of(struct tc35
  17         /*
  18          * The CSI bps per lane must be between 62.5 Mbps and 1 Gbps.
  19          * The default is 594 Mbps for 4-lane 1080p60 or 2-lane 720p60.
  20 +        * 972 Mbps allows 1080P50 UYVY over 2-lane.
  21          */
  22         bps_pr_lane = 2 * endpoint.link_frequencies[0];
  23         if (bps_pr_lane < 62500000U || bps_pr_lane > 1000000000U) {
  24 @@ -1988,23 +1989,41 @@ static int tc358743_probe_of(struct tc35
  25                                state->pdata.refclk_hz * state->pdata.pll_prd;
  26
  27         /*
  28 -        * FIXME: These timings are from REF_02 for 594 Mbps per lane (297 MHz
  29 -        * link frequency). In principle it should be possible to calculate
  30 +        * FIXME: These timings are from REF_02 for 594 or 972 Mbps per lane
  31 +        * (297 MHz or 486 MHz link frequency).
  32 +        * In principle it should be possible to calculate
  33          * them based on link frequency and resolution.
  34          */
  35 -       if (bps_pr_lane != 594000000U)
  36 +       switch (bps_pr_lane) {
  37 +       default:
  38                 dev_warn(dev, "untested bps per lane: %u bps\n", bps_pr_lane);
  39 -       state->pdata.lineinitcnt = 0xe80;
  40 -       state->pdata.lptxtimecnt = 0x003;
  41 -       /* tclk-preparecnt: 3, tclk-zerocnt: 20 */
  42 -       state->pdata.tclk_headercnt = 0x1403;
  43 -       state->pdata.tclk_trailcnt = 0x00;
  44 -       /* ths-preparecnt: 3, ths-zerocnt: 1 */
  45 -       state->pdata.ths_headercnt = 0x0103;
  46 -       state->pdata.twakeup = 0x4882;
  47 -       state->pdata.tclk_postcnt = 0x008;
  48 -       state->pdata.ths_trailcnt = 0x2;
  49 -       state->pdata.hstxvregcnt = 0;
  50 +       case 594000000U:
  51 +               state->pdata.lineinitcnt = 0xe80;
  52 +               state->pdata.lptxtimecnt = 0x003;
  53 +               /* tclk-preparecnt: 3, tclk-zerocnt: 20 */
  54 +               state->pdata.tclk_headercnt = 0x1403;
  55 +               state->pdata.tclk_trailcnt = 0x00;
  56 +               /* ths-preparecnt: 3, ths-zerocnt: 1 */
  57 +               state->pdata.ths_headercnt = 0x0103;
  58 +               state->pdata.twakeup = 0x4882;
  59 +               state->pdata.tclk_postcnt = 0x008;
  60 +               state->pdata.ths_trailcnt = 0x2;
  61 +               state->pdata.hstxvregcnt = 0;
  62 +               break;
  63 +       case 972000000U:
  64 +               state->pdata.lineinitcnt = 0x1b58;
  65 +               state->pdata.lptxtimecnt = 0x007;
  66 +               /* tclk-preparecnt: 6, tclk-zerocnt: 40 */
  67 +               state->pdata.tclk_headercnt = 0x2806;
  68 +               state->pdata.tclk_trailcnt = 0x00;
  69 +               /* ths-preparecnt: 6, ths-zerocnt: 8 */
  70 +               state->pdata.ths_headercnt = 0x0806;
  71 +               state->pdata.twakeup = 0x4268;
  72 +               state->pdata.tclk_postcnt = 0x008;
  73 +               state->pdata.ths_trailcnt = 0x5;
  74 +               state->pdata.hstxvregcnt = 0;
  75 +               break;
  76 +       }
  77
  78         state->reset_gpio = devm_gpiod_get_optional(dev, "reset",
  79                                                     GPIOD_OUT_LOW);