Re: [Intel-gfx] [PATCH 01/13] drm/connector: Add define for HDMI 1.4 Maximum Pixel Rate

Neil Armstrong
2021-11-03T09:08:12Z

On 02/11/2021 15:59, Maxime Ripard wrote:
> A lot of drivers open-code the HDMI 1.4 maximum pixel rate in their
> driver to test whether the resolutions are supported or if the
> scrambling needs to be enabled.
>
> Let's create a common define for everyone to use it.
>
> Cc: Alex Deucher <alexander.deucher@amd.com>
> Cc: amd-gfx@lists.freedesktop.org
> Cc: Andrzej Hajda <a.hajda@samsung.com>
> Cc: Benjamin Gaignard <benjamin.gaignard@linaro.org>
> Cc: "Christian König" <christian.koenig@amd.com>
> Cc: Emma Anholt <emma@anholt.net>
> Cc: intel-gfx@lists.freedesktop.org
> Cc: Jani Nikula <jani.nikula@linux.intel.com>
> Cc: Jernej Skrabec <jernej.skrabec@gmail.com>
> Cc: Jerome Brunet <jbrunet@baylibre.com>
> Cc: Jonas Karlman <jonas@kwiboo.se>
> Cc: Jonathan Hunter <jonathanh@nvidia.com>
> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
> Cc: Kevin Hilman <khilman@baylibre.com>
> Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
> Cc: linux-amlogic@lists.infradead.org
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: linux-tegra@vger.kernel.org
> Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
> Cc: Neil Armstrong <narmstrong@baylibre.com>
> Cc: "Pan, Xinhui" <Xinhui.Pan@amd.com>
> Cc: Robert Foss <robert.foss@linaro.org>
> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> Cc: Thierry Reding <thierry.reding@gmail.com>
> Signed-off-by: Maxime Ripard <maxime@cerno.tech>
> ---
> drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 4 ++--
> drivers/gpu/drm/drm_edid.c | 2 +-
> drivers/gpu/drm/i915/display/intel_hdmi.c | 2 +-
> drivers/gpu/drm/meson/meson_dw_hdmi.c | 4 ++--
> drivers/gpu/drm/radeon/radeon_encoders.c | 2 +-
> drivers/gpu/drm/sti/sti_hdmi_tx3g4c28phy.c | 2 +-
> drivers/gpu/drm/tegra/sor.c | 8 ++++----
> drivers/gpu/drm/vc4/vc4_hdmi.c | 4 ++--
> include/drm/drm_connector.h | 2 ++
> 9 files changed, 16 insertions(+), 14 deletions(-)

For meson & bridge/synopsys/dw-hdmi:

Acked-by: Neil Armstrong <narmstrong@baylibre.com>

>
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> index 62ae63565d3a..3a58db357be0 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -46,7 +46,7 @@
> /* DW-HDMI Controller >= 0x200a are at least compliant with SCDC version 1 */
> #define SCDC_MIN_SOURCE_VERSION 0x1
>
> -#define HDMI14_MAX_TMDSCLK 340000000
> +#define HDMI14_MAX_TMDSCLK (DRM_HDMI_14_MAX_TMDS_CLK_KHZ * 1000)
>
> enum hdmi_datamap {
> RGB444_8B = 0x01,
> @@ -1264,7 +1264,7 @@ static bool dw_hdmi_support_scdc(struct dw_hdmi *hdmi,
> * for low rates is not supported either
> */
> if (!display->hdmi.scdc.scrambling.low_rates &&
> - display->max_tmds_clock <= 340000)
> + display->max_tmds_clock <= DRM_HDMI_14_MAX_TMDS_CLK_KHZ)
> return false;
>
> return true;
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 7aa2a56a71c8..ec8fb2d098ae 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -4966,7 +4966,7 @@ static void drm_parse_hdmi_forum_vsdb(struct drm_connector *connector,
> u32 max_tmds_clock = hf_vsdb[5] * 5000;
> struct drm_scdc *scdc = &hdmi->scdc;
>
> - if (max_tmds_clock > 340000) {
> + if (max_tmds_clock > DRM_HDMI_14_MAX_TMDS_CLK_KHZ) {
> display->max_tmds_clock = max_tmds_clock;
> DRM_DEBUG_KMS("HF-VSDB: max TMDS clock %d kHz\n",
> display->max_tmds_clock);
> diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
> index d2e61f6c6e08..0666203d52b7 100644
> --- a/drivers/gpu/drm/i915/display/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
> @@ -2226,7 +2226,7 @@ int intel_hdmi_compute_config(struct intel_encoder *encoder,
> if (scdc->scrambling.low_rates)
> pipe_config->hdmi_scrambling = true;
>
> - if (pipe_config->port_clock > 340000) {
> + if (pipe_config->port_clock > DRM_HDMI_14_MAX_TMDS_CLK_KHZ) {
> pipe_config->hdmi_scrambling = true;
> pipe_config->hdmi_high_tmds_clock_ratio = true;
> }
> diff --git a/drivers/gpu/drm/meson/meson_dw_hdmi.c b/drivers/gpu/drm/meson/meson_dw_hdmi.c
> index 0afbd1e70bfc..8078667aea0e 100644
> --- a/drivers/gpu/drm/meson/meson_dw_hdmi.c
> +++ b/drivers/gpu/drm/meson/meson_dw_hdmi.c
> @@ -434,7 +434,7 @@ static int dw_hdmi_phy_init(struct dw_hdmi *hdmi, void *data,
> readl_relaxed(priv->io_base + _REG(VPU_HDMI_SETTING));
>
> DRM_DEBUG_DRIVER("\"%s\" div%d\n", mode->name,
> - mode->clock > 340000 ? 40 : 10);
> + mode->clock > DRM_HDMI_14_MAX_TMDS_CLK_KHZ ? 40 : 10);
>
> /* Enable clocks */
> regmap_update_bits(priv->hhi, HHI_HDMI_CLK_CNTL, 0xffff, 0x100);
> @@ -457,7 +457,7 @@ static int dw_hdmi_phy_init(struct dw_hdmi *hdmi, void *data,
> dw_hdmi->data->top_write(dw_hdmi, HDMITX_TOP_BIST_CNTL, BIT(12));
>
> /* TMDS pattern setup */
> - if (mode->clock > 340000 &&
> + if (mode->clock > DRM_HDMI_14_MAX_TMDS_CLK_KHZ &&
> dw_hdmi->output_bus_fmt == MEDIA_BUS_FMT_YUV8_1X24) {
> dw_hdmi->data->top_write(dw_hdmi, HDMITX_TOP_TMDS_CLK_PTTN_01,
> 0);
> diff --git a/drivers/gpu/drm/radeon/radeon_encoders.c b/drivers/gpu/drm/radeon/radeon_encoders.c
> index 46549d5179ee..ddd8100e699f 100644
> --- a/drivers/gpu/drm/radeon/radeon_encoders.c
> +++ b/drivers/gpu/drm/radeon/radeon_encoders.c
> @@ -384,7 +384,7 @@ bool radeon_dig_monitor_is_duallink(struct drm_encoder *encoder,
> if (radeon_connector->use_digital) {
> /* HDMI 1.3 supports up to 340 Mhz over single link */
> if (ASIC_IS_DCE6(rdev) && drm_detect_hdmi_monitor(radeon_connector_edid(connector))) {
> - if (pixel_clock > 340000)
> + if (pixel_clock > DRM_HDMI_14_MAX_TMDS_CLK_KHZ)
> return true;
> else
> return false;
> diff --git a/drivers/gpu/drm/sti/sti_hdmi_tx3g4c28phy.c b/drivers/gpu/drm/sti/sti_hdmi_tx3g4c28phy.c
> index d25ecd4f4b67..bc213232a875 100644
> --- a/drivers/gpu/drm/sti/sti_hdmi_tx3g4c28phy.c
> +++ b/drivers/gpu/drm/sti/sti_hdmi_tx3g4c28phy.c
> @@ -102,7 +102,7 @@ static bool sti_hdmi_tx3g4c28phy_start(struct sti_hdmi *hdmi)
> tmdsck = ckpxpll;
> pllctrl |= 40 << PLL_CFG_NDIV_SHIFT;
>
> - if (tmdsck > 340000000) {
> + if (tmdsck > (DRM_HDMI_14_MAX_TMDS_CLK_KHZ * 1000)) {
> DRM_ERROR("output TMDS clock (%d) out of range\n", tmdsck);
> goto err;
> }
> diff --git a/drivers/gpu/drm/tegra/sor.c b/drivers/gpu/drm/tegra/sor.c
> index 0ea320c1092b..99a2d627bfeb 100644
> --- a/drivers/gpu/drm/tegra/sor.c
> +++ b/drivers/gpu/drm/tegra/sor.c
> @@ -1814,7 +1814,7 @@ tegra_sor_encoder_atomic_check(struct drm_encoder *encoder,
> * For HBR2 modes, the SOR brick needs to use the x20 multiplier, so
> * the pixel clock must be corrected accordingly.
> */
> - if (pclk >= 340000000) {
> + if (pclk >= (DRM_HDMI_14_MAX_TMDS_CLK_KHZ * 1000)) {
> state->link_speed = 20;
> state->pclk = pclk / 2;
> } else {
> @@ -2196,7 +2196,7 @@ static void tegra_sor_hdmi_scdc_start(struct tegra_sor *sor)
>
> mode = &sor->output.encoder.crtc->state->adjusted_mode;
>
> - if (mode->clock >= 340000 && scdc->supported) {
> + if (mode->clock >= DRM_HDMI_14_MAX_TMDS_CLK_KHZ && scdc->supported) {
> schedule_delayed_work(&sor->scdc, msecs_to_jiffies(5000));
> tegra_sor_hdmi_scdc_enable(sor);
> sor->scdc_enabled = true;
> @@ -2340,7 +2340,7 @@ static void tegra_sor_hdmi_enable(struct drm_encoder *encoder)
> value &= ~SOR_CLK_CNTRL_DP_LINK_SPEED_MASK;
> value &= ~SOR_CLK_CNTRL_DP_CLK_SEL_MASK;
>
> - if (mode->clock < 340000) {
> + if (mode->clock < DRM_HDMI_14_MAX_TMDS_CLK_KHZ) {
> DRM_DEBUG_KMS("setting 2.7 GHz link speed\n");
> value |= SOR_CLK_CNTRL_DP_LINK_SPEED_G2_70;
> } else {
> @@ -2423,7 +2423,7 @@ static void tegra_sor_hdmi_enable(struct drm_encoder *encoder)
> /* adjust clock rate for HDMI 2.0 modes */
> rate = clk_get_rate(sor->clk_parent);
>
> - if (mode->clock >= 340000)
> + if (mode->clock >= DRM_HDMI_14_MAX_TMDS_CLK_KHZ)
> rate /= 2;
>
> DRM_DEBUG_KMS("setting clock to %lu Hz, mode: %lu Hz\n", rate, pclk);
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
> index fab9b93e1b84..fc7247cc1022 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
> @@ -97,11 +97,11 @@
> #define HSM_MIN_CLOCK_FREQ 120000000
> #define CEC_CLOCK_FREQ 40000
>
> -#define HDMI_14_MAX_TMDS_CLK (340 * 1000 * 1000)
> +#define HDMI_14_MAX_TMDS_CLK (DRM_HDMI_14_MAX_TMDS_CLK_KHZ * 1000)
>
> static bool vc4_hdmi_mode_needs_scrambling(const struct drm_display_mode *mode)
> {
> - return (mode->clock * 1000) > HDMI_14_MAX_TMDS_CLK;
> + return mode->clock > DRM_HDMI_14_MAX_TMDS_CLK_KHZ;
> }
>
> static int vc4_hdmi_debugfs_regs(struct seq_file *m, void *unused)
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index b501d0badaea..030636635af1 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -260,6 +260,8 @@ struct drm_hdmi_info {
> struct drm_hdmi_dsc_cap dsc_cap;
> };
>
> +#define DRM_HDMI_14_MAX_TMDS_CLK_KHZ (340 * 1000)
> +
> /**
> * enum drm_link_status - connector's link_status property value
> *
>