[PATCH v7 9/9] drm/vc4: hdmi: Enable 10/12 bpc output

Dave Stevenson dave.stevenson at raspberrypi.com
Tue Dec 15 17:23:10 UTC 2020


Hi Maxime

On Tue, 15 Dec 2020 at 15:43, Maxime Ripard <maxime at cerno.tech> wrote:
>
> The BCM2711 supports higher bpc count than just 8, so let's support it in
> our driver.
>
> Signed-off-by: Maxime Ripard <maxime at cerno.tech>

Reviewed-by: Dave Stevenson <dave.stevenson at raspberrypi.com>


> ---
>  drivers/gpu/drm/vc4/vc4_hdmi.c      | 70 ++++++++++++++++++++++++++++-
>  drivers/gpu/drm/vc4/vc4_hdmi.h      |  1 +
>  drivers/gpu/drm/vc4/vc4_hdmi_regs.h |  9 ++++
>  3 files changed, 79 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
> index 41897b8e9d51..2e5449b25ce4 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
> @@ -76,6 +76,17 @@
>  #define VC5_HDMI_VERTB_VSPO_SHIFT              16
>  #define VC5_HDMI_VERTB_VSPO_MASK               VC4_MASK(29, 16)
>
> +#define VC5_HDMI_DEEP_COLOR_CONFIG_1_INIT_PACK_PHASE_SHIFT     8
> +#define VC5_HDMI_DEEP_COLOR_CONFIG_1_INIT_PACK_PHASE_MASK      VC4_MASK(10, 8)
> +
> +#define VC5_HDMI_DEEP_COLOR_CONFIG_1_COLOR_DEPTH_SHIFT         0
> +#define VC5_HDMI_DEEP_COLOR_CONFIG_1_COLOR_DEPTH_MASK          VC4_MASK(3, 0)
> +
> +#define VC5_HDMI_GCP_CONFIG_GCP_ENABLE         BIT(31)
> +
> +#define VC5_HDMI_GCP_WORD_1_GCP_SUBPACKET_BYTE_1_SHIFT 8
> +#define VC5_HDMI_GCP_WORD_1_GCP_SUBPACKET_BYTE_1_MASK  VC4_MASK(15, 8)
> +
>  # define VC4_HD_M_SW_RST                       BIT(2)
>  # define VC4_HD_M_ENABLE                       BIT(0)
>
> @@ -186,6 +197,8 @@ static void vc4_hdmi_connector_reset(struct drm_connector *connector)
>         if (!new_state)
>                 return;
>
> +       new_state->base.max_bpc = 8;
> +       new_state->base.max_requested_bpc = 8;
>         drm_atomic_helper_connector_tv_reset(connector);
>  }
>
> @@ -232,12 +245,20 @@ static int vc4_hdmi_connector_init(struct drm_device *dev,
>                                     vc4_hdmi->ddc);
>         drm_connector_helper_add(connector, &vc4_hdmi_connector_helper_funcs);
>
> +       /*
> +        * Some of the properties below require access to state, like bpc.
> +        * Allocate some default initial connector state with our reset helper.
> +        */
> +       if (connector->funcs->reset)
> +               connector->funcs->reset(connector);
> +
>         /* Create and attach TV margin props to this connector. */
>         ret = drm_mode_create_tv_margin_properties(dev);
>         if (ret)
>                 return ret;
>
>         drm_connector_attach_tv_margin_properties(connector);
> +       drm_connector_attach_max_bpc_property(connector, 8, 12);
>
>         connector->polled = (DRM_CONNECTOR_POLL_CONNECT |
>                              DRM_CONNECTOR_POLL_DISCONNECT);
> @@ -506,6 +527,7 @@ static void vc5_hdmi_csc_setup(struct vc4_hdmi *vc4_hdmi, bool enable)
>  }
>
>  static void vc4_hdmi_set_timings(struct vc4_hdmi *vc4_hdmi,
> +                                struct drm_connector_state *state,
>                                  struct drm_display_mode *mode)
>  {
>         bool hsync_pos = mode->flags & DRM_MODE_FLAG_PHSYNC;
> @@ -549,7 +571,9 @@ static void vc4_hdmi_set_timings(struct vc4_hdmi *vc4_hdmi,
>         HDMI_WRITE(HDMI_VERTB0, vertb_even);
>         HDMI_WRITE(HDMI_VERTB1, vertb);
>  }
> +
>  static void vc5_hdmi_set_timings(struct vc4_hdmi *vc4_hdmi,
> +                                struct drm_connector_state *state,
>                                  struct drm_display_mode *mode)
>  {
>         bool hsync_pos = mode->flags & DRM_MODE_FLAG_PHSYNC;
> @@ -569,6 +593,9 @@ static void vc5_hdmi_set_timings(struct vc4_hdmi *vc4_hdmi,
>                                         mode->crtc_vsync_end -
>                                         interlaced,
>                                         VC4_HDMI_VERTB_VBP));
> +       unsigned char gcp;
> +       bool gcp_en;
> +       u32 reg;
>
>         HDMI_WRITE(HDMI_VEC_INTERFACE_XBAR, 0x354021);
>         HDMI_WRITE(HDMI_HORZA,
> @@ -594,6 +621,39 @@ static void vc5_hdmi_set_timings(struct vc4_hdmi *vc4_hdmi,
>         HDMI_WRITE(HDMI_VERTB0, vertb_even);
>         HDMI_WRITE(HDMI_VERTB1, vertb);
>
> +       switch (state->max_bpc) {
> +       case 12:
> +               gcp = 6;
> +               gcp_en = true;
> +               break;
> +       case 10:
> +               gcp = 5;
> +               gcp_en = true;
> +               break;
> +       case 8:
> +       default:
> +               gcp = 4;
> +               gcp_en = false;
> +               break;
> +       }
> +
> +       reg = HDMI_READ(HDMI_DEEP_COLOR_CONFIG_1);
> +       reg &= ~(VC5_HDMI_DEEP_COLOR_CONFIG_1_INIT_PACK_PHASE_MASK |
> +                VC5_HDMI_DEEP_COLOR_CONFIG_1_COLOR_DEPTH_MASK);
> +       reg |= VC4_SET_FIELD(2, VC5_HDMI_DEEP_COLOR_CONFIG_1_INIT_PACK_PHASE) |
> +              VC4_SET_FIELD(gcp, VC5_HDMI_DEEP_COLOR_CONFIG_1_COLOR_DEPTH);
> +       HDMI_WRITE(HDMI_DEEP_COLOR_CONFIG_1, reg);
> +
> +       reg = HDMI_READ(HDMI_GCP_WORD_1);
> +       reg &= ~VC5_HDMI_GCP_WORD_1_GCP_SUBPACKET_BYTE_1_MASK;
> +       reg |= VC4_SET_FIELD(gcp, VC5_HDMI_GCP_WORD_1_GCP_SUBPACKET_BYTE_1);
> +       HDMI_WRITE(HDMI_GCP_WORD_1, reg);
> +
> +       reg = HDMI_READ(HDMI_GCP_CONFIG);
> +       reg &= ~VC5_HDMI_GCP_CONFIG_GCP_ENABLE;
> +       reg |= gcp_en ? VC5_HDMI_GCP_CONFIG_GCP_ENABLE : 0;
> +       HDMI_WRITE(HDMI_GCP_CONFIG, reg);
> +
>         HDMI_WRITE(HDMI_CLOCK_STOP, 0);
>  }
>
> @@ -731,7 +791,7 @@ static void vc4_hdmi_encoder_pre_crtc_configure(struct drm_encoder *encoder,
>                    VC4_HDMI_SCHEDULER_CONTROL_IGNORE_VSYNC_PREDICTS);
>
>         if (vc4_hdmi->variant->set_timings)
> -               vc4_hdmi->variant->set_timings(vc4_hdmi, mode);
> +               vc4_hdmi->variant->set_timings(vc4_hdmi, conn_state, mode);
>  }
>
>  static void vc4_hdmi_encoder_pre_crtc_enable(struct drm_encoder *encoder,
> @@ -852,6 +912,14 @@ static int vc4_hdmi_encoder_atomic_check(struct drm_encoder *encoder,
>                 pixel_rate = mode->clock * 1000;
>         }
>
> +       if (conn_state->max_bpc == 12) {
> +               pixel_rate = pixel_rate * 150;
> +               do_div(pixel_rate, 100);
> +       } else if (conn_state->max_bpc == 10) {
> +               pixel_rate = pixel_rate * 125;
> +               do_div(pixel_rate, 100);
> +       }
> +
>         if (mode->flags & DRM_MODE_FLAG_DBLCLK)
>                 pixel_rate = pixel_rate * 2;
>
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.h b/drivers/gpu/drm/vc4/vc4_hdmi.h
> index 60c53d7c9bad..4c8994cfd932 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.h
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.h
> @@ -77,6 +77,7 @@ struct vc4_hdmi_variant {
>
>         /* Callback to configure the video timings in the HDMI block */
>         void (*set_timings)(struct vc4_hdmi *vc4_hdmi,
> +                           struct drm_connector_state *state,
>                             struct drm_display_mode *mode);
>
>         /* Callback to initialize the PHY according to the connector state */
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi_regs.h b/drivers/gpu/drm/vc4/vc4_hdmi_regs.h
> index 96d764ebfe67..401863cb8c98 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi_regs.h
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi_regs.h
> @@ -59,9 +59,12 @@ enum vc4_hdmi_field {
>          */
>         HDMI_CTS_0,
>         HDMI_CTS_1,
> +       HDMI_DEEP_COLOR_CONFIG_1,
>         HDMI_DVP_CTL,
>         HDMI_FIFO_CTL,
>         HDMI_FRAME_COUNT,
> +       HDMI_GCP_CONFIG,
> +       HDMI_GCP_WORD_1,
>         HDMI_HORZA,
>         HDMI_HORZB,
>         HDMI_HOTPLUG,
> @@ -229,6 +232,9 @@ static const struct vc4_hdmi_register __maybe_unused vc5_hdmi_hdmi0_fields[] = {
>         VC4_HDMI_REG(HDMI_VERTB1, 0x0f8),
>         VC4_HDMI_REG(HDMI_MAI_CHANNEL_MAP, 0x09c),
>         VC4_HDMI_REG(HDMI_MAI_CONFIG, 0x0a0),
> +       VC4_HDMI_REG(HDMI_DEEP_COLOR_CONFIG_1, 0x170),
> +       VC4_HDMI_REG(HDMI_GCP_CONFIG, 0x178),
> +       VC4_HDMI_REG(HDMI_GCP_WORD_1, 0x17c),
>         VC4_HDMI_REG(HDMI_HOTPLUG, 0x1a8),
>
>         VC5_DVP_REG(HDMI_CLOCK_STOP, 0x0bc),
> @@ -305,6 +311,9 @@ static const struct vc4_hdmi_register __maybe_unused vc5_hdmi_hdmi1_fields[] = {
>         VC4_HDMI_REG(HDMI_VERTB1, 0x0f8),
>         VC4_HDMI_REG(HDMI_MAI_CHANNEL_MAP, 0x09c),
>         VC4_HDMI_REG(HDMI_MAI_CONFIG, 0x0a0),
> +       VC4_HDMI_REG(HDMI_DEEP_COLOR_CONFIG_1, 0x170),
> +       VC4_HDMI_REG(HDMI_GCP_CONFIG, 0x178),
> +       VC4_HDMI_REG(HDMI_GCP_WORD_1, 0x17c),
>         VC4_HDMI_REG(HDMI_HOTPLUG, 0x1a8),
>
>         VC5_DVP_REG(HDMI_CLOCK_STOP, 0x0bc),
> --
> 2.29.2
>


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