From c85695a2016e2ed0f3641f9f5917642e7d3c3721 Mon Sep 17 00:00:00 2001 From: Maxime Ripard Date: Fri, 7 May 2021 17:05:13 +0200 Subject: [PATCH] drm/vc4: hdmi: Enable the scrambler The HDMI controller on the BCM2711 includes a scrambler in order to reach the HDMI 2.0 modes that require it. Let's add the support for it. Acked-by: Thomas Zimmermann Signed-off-by: Maxime Ripard Reviewed-by: Dave Stevenson Link: https://patchwork.freedesktop.org/patch/msgid/20210507150515.257424-11-maxime@cerno.tech --- drivers/gpu/drm/vc4/vc4_hdmi.c | 64 +++++++++++++++++++++++++++++++++++++ drivers/gpu/drm/vc4/vc4_hdmi_regs.h | 3 ++ 2 files changed, 67 insertions(+) diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c index 7b93621..f67c6f6 100644 --- a/drivers/gpu/drm/vc4/vc4_hdmi.c +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c @@ -35,6 +35,7 @@ #include #include #include +#include #include #include #include @@ -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) @@ -518,6 +521,64 @@ static void vc4_hdmi_set_infoframes(struct drm_encoder *encoder) vc4_hdmi_set_hdr_infoframe(encoder); } +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; + + 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; + + if (!vc4_hdmi_mode_needs_scrambling(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 vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder); + struct drm_crtc *crtc = encoder->crtc; + + /* + * At boot, encoder->crtc will be NULL. Since we don't know the + * state of the scrambler and in order to avoid any + * inconsistency, let's disable it all the time. + */ + if (crtc && !vc4_hdmi_supports_scrambling(encoder, &crtc->mode)) + return; + + if (crtc && !vc4_hdmi_mode_needs_scrambling(&crtc->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) { @@ -530,6 +591,8 @@ 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, @@ -980,6 +1043,7 @@ 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 e1b58ea..19d2fdc 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, @@ -238,6 +239,7 @@ static const struct vc4_hdmi_register __maybe_unused vc5_hdmi_hdmi0_fields[] = { VC4_HDMI_REG(HDMI_GCP_CONFIG, 0x178), VC4_HDMI_REG(HDMI_GCP_WORD_1, 0x17c), VC4_HDMI_REG(HDMI_HOTPLUG, 0x1a8), + VC4_HDMI_REG(HDMI_SCRAMBLER_CTL, 0x1c4), VC5_DVP_REG(HDMI_CLOCK_STOP, 0x0bc), VC5_DVP_REG(HDMI_VEC_INTERFACE_XBAR, 0x0f0), @@ -317,6 +319,7 @@ static const struct vc4_hdmi_register __maybe_unused vc5_hdmi_hdmi1_fields[] = { VC4_HDMI_REG(HDMI_GCP_CONFIG, 0x178), VC4_HDMI_REG(HDMI_GCP_WORD_1, 0x17c), VC4_HDMI_REG(HDMI_HOTPLUG, 0x1a8), + VC4_HDMI_REG(HDMI_SCRAMBLER_CTL, 0x1c4), VC5_DVP_REG(HDMI_CLOCK_STOP, 0x0bc), VC5_DVP_REG(HDMI_VEC_INTERFACE_XBAR, 0x0f0), -- 2.7.4