The HDMI controller on the BCM2711 includes a scrambler in order to reach the modes that require it. Let's add the support for it.
Signed-off-by: Maxime Ripard maxime@cerno.tech --- drivers/gpu/drm/vc4/vc4_hdmi.c | 58 +++++++++++++++++++++++++++++ drivers/gpu/drm/vc4/vc4_hdmi_regs.h | 3 ++ 2 files changed, 61 insertions(+)
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c index f05f6da286f7..1a6babb53cf4 100644 --- a/drivers/gpu/drm/vc4/vc4_hdmi.c +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c @@ -35,6 +35,7 @@ #include <drm/drm_edid.h> #include <drm/drm_probe_helper.h> #include <drm/drm_simple_kms_helper.h> +#include <drm/drm_scdc_helper.h> #include <linux/clk.h> #include <linux/component.h> #include <linux/i2c.h> @@ -76,6 +77,8 @@ #define VC5_HDMI_VERTB_VSPO_SHIFT 16 #define VC5_HDMI_VERTB_VSPO_MASK VC4_MASK(29, 16)
+#define VC5_HDMI_SCRAMBLER_CTL_ENABLE BIT(0) + #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)
@@ -445,6 +448,58 @@ static void vc4_hdmi_set_infoframes(struct drm_encoder *encoder) vc4_hdmi_set_audio_infoframe(encoder); }
+#define HDMI_14_MAX_TMDS_CLK (340 * 1000 * 1000) + +static bool vc4_hdmi_supports_scrambling(struct drm_encoder *encoder, + struct drm_display_mode *mode) +{ + struct vc4_hdmi_encoder *vc4_encoder = to_vc4_hdmi_encoder(encoder); + struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder); + struct drm_display_info *display = &vc4_hdmi->connector.display_info; + + if (!vc4_encoder->hdmi_monitor) + return false; + + if (!display->hdmi.scdc.supported || + !display->hdmi.scdc.scrambling.supported) + return false; + + if ((mode->clock * 1000) < HDMI_14_MAX_TMDS_CLK) + return false; + + return true; +} + +static void vc4_hdmi_enable_scrambling(struct drm_encoder *encoder) +{ + struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode; + struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder); + + if (!vc4_hdmi_supports_scrambling(encoder, mode)) + return; + + drm_scdc_set_high_tmds_clock_ratio(vc4_hdmi->ddc, true); + drm_scdc_set_scrambling(vc4_hdmi->ddc, true); + + HDMI_WRITE(HDMI_SCRAMBLER_CTL, HDMI_READ(HDMI_SCRAMBLER_CTL) | + VC5_HDMI_SCRAMBLER_CTL_ENABLE); +} + +static void vc4_hdmi_disable_scrambling(struct drm_encoder *encoder) +{ + struct drm_display_mode *mode = &encoder->crtc->mode; + struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder); + + if (!vc4_hdmi_supports_scrambling(encoder, mode)) + return; + + HDMI_WRITE(HDMI_SCRAMBLER_CTL, HDMI_READ(HDMI_SCRAMBLER_CTL) & + ~VC5_HDMI_SCRAMBLER_CTL_ENABLE); + + drm_scdc_set_scrambling(vc4_hdmi->ddc, false); + drm_scdc_set_high_tmds_clock_ratio(vc4_hdmi->ddc, false); +} + static void vc4_hdmi_encoder_post_crtc_disable(struct drm_encoder *encoder, struct drm_atomic_state *state) { @@ -457,6 +512,8 @@ static void vc4_hdmi_encoder_post_crtc_disable(struct drm_encoder *encoder,
HDMI_WRITE(HDMI_VID_CTL, HDMI_READ(HDMI_VID_CTL) | VC4_HD_VID_CTL_BLANKPIX); + + vc4_hdmi_disable_scrambling(encoder); }
static void vc4_hdmi_encoder_post_crtc_powerdown(struct drm_encoder *encoder, @@ -901,6 +958,7 @@ static void vc4_hdmi_encoder_post_crtc_enable(struct drm_encoder *encoder, }
vc4_hdmi_recenter_fifo(vc4_hdmi); + vc4_hdmi_enable_scrambling(encoder); }
static void vc4_hdmi_encoder_enable(struct drm_encoder *encoder) diff --git a/drivers/gpu/drm/vc4/vc4_hdmi_regs.h b/drivers/gpu/drm/vc4/vc4_hdmi_regs.h index e1b58eac766f..6897586228ad 100644 --- a/drivers/gpu/drm/vc4/vc4_hdmi_regs.h +++ b/drivers/gpu/drm/vc4/vc4_hdmi_regs.h @@ -100,6 +100,7 @@ enum vc4_hdmi_field { HDMI_RM_FORMAT, HDMI_RM_OFFSET, HDMI_SCHEDULER_CONTROL, + HDMI_SCRAMBLER_CTL, HDMI_SW_RESET_CONTROL, HDMI_TX_PHY_CHANNEL_SWAP, HDMI_TX_PHY_CLK_DIV, @@ -234,6 +235,7 @@ 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_SCRAMBLER_CTL, 0x1c4), VC4_HDMI_REG(HDMI_DEEP_COLOR_CONFIG_1, 0x170), VC4_HDMI_REG(HDMI_GCP_CONFIG, 0x178), VC4_HDMI_REG(HDMI_GCP_WORD_1, 0x17c), @@ -313,6 +315,7 @@ 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_SCRAMBLER_CTL, 0x1c4), VC4_HDMI_REG(HDMI_DEEP_COLOR_CONFIG_1, 0x170), VC4_HDMI_REG(HDMI_GCP_CONFIG, 0x178), VC4_HDMI_REG(HDMI_GCP_WORD_1, 0x17c),