target/linux/bcm27xx/patches-5.4/950-0715-vc4_hdmi-Adjust-CEC-ref-clock-based-on-its-input-clo.patch

   1 From 32e84f4f525e2a0d7dc021b5795df34407096b0e Mon Sep 17 00:00:00 2001
   2 From: Dom Cobley <popcornmix@gmail.com>
   3 Date: Thu, 7 May 2020 18:16:08 +0100
   4 Subject: [PATCH] vc4_hdmi: Adjust CEC ref clock based on its input
   5  clock
   6
   7 2711 uses a fixed 27MHz input, earlier models use the HSM clock
   8
   9 Signed-off-by: Dom Cobley <popcornmix@gmail.com>
  10 ---
  11  drivers/gpu/drm/vc4/vc4_hdmi.c | 11 ++++++++---
  12  drivers/gpu/drm/vc4/vc4_hdmi.h |  3 +++
  13  2 files changed, 11 insertions(+), 3 deletions(-)
  14
  15 --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
  16 +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
  17 @@ -79,6 +79,7 @@
  18  # define VC4_HD_M_ENABLE                       BIT(0)
  19
  20  #define CEC_CLOCK_FREQ 40000
  21 +#define VC4_HSM_CLOCK 163682864
  22
  23  static int vc4_hdmi_debugfs_regs(struct seq_file *m, void *unused)
  24  {
  25 @@ -755,8 +756,7 @@ static u32 vc4_hdmi_calc_hsm_clock(struc
  26          * needs to be a bit higher than the pixel clock rate
  27          * (generally 148.5Mhz).
  28          */
  29 -
  30 -       return 163682864;
  31 +       return VC4_HSM_CLOCK;
  32  }
  33
  34  static u32 vc5_hdmi_calc_hsm_clock(struct vc4_hdmi *vc4_hdmi, unsigned long pixel_rate)
  35 @@ -1399,6 +1399,7 @@ static int vc4_hdmi_cec_init(struct vc4_
  36         struct cec_connector_info conn_info;
  37         struct platform_device *pdev = vc4_hdmi->pdev;
  38         u32 value;
  39 +       u32 clk_cnt;
  40         int ret;
  41
  42         if (!vc4_hdmi->variant->cec_available)
  43 @@ -1423,8 +1424,9 @@ static int vc4_hdmi_cec_init(struct vc4_
  44          * divider: the hsm_clock rate and this divider setting will
  45          * give a 40 kHz CEC clock.
  46          */
  47 +       clk_cnt = vc4_hdmi->variant->cec_input_clock / CEC_CLOCK_FREQ;
  48         value |= VC4_HDMI_CEC_ADDR_MASK |
  49 -                (4091 << VC4_HDMI_CEC_DIV_CLK_CNT_SHIFT);
  50 +                ((clk_cnt-1) << VC4_HDMI_CEC_DIV_CLK_CNT_SHIFT);
  51         HDMI_WRITE(HDMI_CEC_CNTRL_1, value);
  52         ret = devm_request_threaded_irq(&pdev->dev, platform_get_irq(pdev, 0),
  53                                         vc4_cec_irq_handler,
  54 @@ -1769,6 +1771,7 @@ static int vc4_hdmi_dev_remove(struct pl
  55
  56  static const struct vc4_hdmi_variant bcm2835_variant = {
  57         .max_pixel_clock        = 162000000,
  58 +       .cec_input_clock        = VC4_HSM_CLOCK,
  59         .audio_available        = true,
  60         .cec_available          = true,
  61         .registers              = vc4_hdmi_fields,
  62 @@ -1793,6 +1796,7 @@ static const struct vc4_hdmi_variant bcm
  63         .id                     = 0,
  64         .audio_available        = true,
  65         .max_pixel_clock        = 297000000,
  66 +       .cec_input_clock        = 27000000,
  67         .registers              = vc5_hdmi_hdmi0_fields,
  68         .num_registers          = ARRAY_SIZE(vc5_hdmi_hdmi0_fields),
  69         .phy_lane_mapping       = {
  70 @@ -1820,6 +1824,7 @@ static const struct vc4_hdmi_variant bcm
  71         .id                     = 1,
  72         .audio_available        = true,
  73         .max_pixel_clock        = 297000000,
  74 +       .cec_input_clock        = 27000000,
  75         .registers              = vc5_hdmi_hdmi1_fields,
  76         .num_registers          = ARRAY_SIZE(vc5_hdmi_hdmi1_fields),
  77         .phy_lane_mapping       = {
  78 --- a/drivers/gpu/drm/vc4/vc4_hdmi.h
  79 +++ b/drivers/gpu/drm/vc4/vc4_hdmi.h
  80 @@ -48,6 +48,9 @@ struct vc4_hdmi_variant {
  81         /* Maximum pixel clock supported by the controller (in Hz) */
  82         unsigned long long max_pixel_clock;
  83
  84 +       /* Input clock frequency of CEC block (in Hz) */
  85 +       unsigned long cec_input_clock;
  86 +
  87         /* List of the registers available on that variant */
  88         const struct vc4_hdmi_register *registers;
  89