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c=relaxed/relaxed; s=zohomail; d=collabora.com; v=1; bh=kvRRQf3VcesMtWRZn4Vf9PO7/HvfnDGh4n87CLoKzo8=; h=Content-Description:Content-ID:Content-Type:Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Owner:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:Resent-Sender:Resent-Cc:Resent-Date:Resent-To:Reply-To:Resent-Message-ID:Resent-From:Sender:Subject:To:Date:From:Message-Id:Reply-To:Subject:To:Cc; Received: by smtp.zohomail.com with SMTPS id 1793894078714173.08349557102235; Thu, 5 Nov 2026 07:54:38 -0800 (PST) From: Nicolas Frattaroli Date: Thu, 05 Nov 2026 16:52:11 +0100 Subject: [PATCH v2 20/27] drm/connector: hdmi: Add QMS state validation and computation X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261105-vrr-limiter-uapi-v2-20-55f4215be2c2@collabora.com> References: <20261105-vrr-limiter-uapi-v2-0-55f4215be2c2@collabora.com> In-Reply-To: <20261105-vrr-limiter-uapi-v2-0-55f4215be2c2@collabora.com> To: Xaver Hugl , Vidith Madhu , "Borah, Chaitanya Kumar" , Leo Li , Harry Wentland , Fangzhi Zuo , Daniel Stone , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Helge Deller , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Luca Ceresoli , Sandy Huang , =?utf-8?q?Heiko_St=C3=BCbner?= , Andy Yan , =?utf-8?q?Michel_D=C3=A4nzer?= Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-fbdev@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org, kernel@collabora.com, Derek Foreman , wayland-devel@lists.freedesktop.org, Nicolas Frattaroli X-Mailer: b4 0.15.2 Add the necessary code to the HDMI state helpers' hdmi_validate_vrr function in order to check and derive the state necessary for HDMI Quick Media Switching (QMS) support. Co-developed-by: Derek Foreman Signed-off-by: Derek Foreman Signed-off-by: Nicolas Frattaroli --- drivers/gpu/drm/display/drm_hdmi_state_helper.c | 112 +++++++++++++++++++++++- 1 file changed, 109 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/display/drm_hdmi_state_helper.c b/drivers/gpu/drm/display/drm_hdmi_state_helper.c index 407ad28c649f..ba290eea7390 100644 --- a/drivers/gpu/drm/display/drm_hdmi_state_helper.c +++ b/drivers/gpu/drm/display/drm_hdmi_state_helper.c @@ -2,6 +2,7 @@ #include #include +#include #include #include @@ -954,6 +955,26 @@ hdmi_generate_infoframes(const struct drm_connector *connector, return 0; } +static const struct { + u8 tfr_byte; + u32 rate_n; + u32 rate_d; +} hdmi_qms_tfrs[] = { + { 1, 24000, 1001 }, + { 2, 24, 1 }, + { 3, 25, 1 }, + { 4, 30000, 1001 }, + { 5, 30, 1 }, + { 6, 48000, 1001 }, + { 7, 48, 1 }, + { 8, 50, 1 }, + { 9, 60000, 1001 }, + { 10, 60, 1 }, + { 11, 100, 1 }, + { 12, 120000, 1001 }, + { 13, 120, 1 }, +}; + /** * cmp_fraction - compares two fractional numbers * @a: numerator of the first fraction @@ -992,6 +1013,66 @@ static int cmp_fraction(u32 a, u32 b, u32 c, u32 d) return 0; } +/** + * hdmi_validate_qms - Validate HDMI QMS state + * @crtc_state: pointer to a &struct drm_crtc_state to run validation on + * @info: pointer to a &struct drm_display_info of the accompanying connector + * + * Validate that the drm_crtc_vrr_state.vrr_min_numerator and + * drm_crtc_vrr_state.vrr_min_denominator are acceptable for HDMI QMS, and check + * that the display is HDMI QMS capable. + * + * Returns: + * - Negative errno on failure + * - the corresponding QMS signaling byte for the target frame rate otherwise + */ +static int hdmi_validate_qms(struct drm_crtc_state *crtc_state, + struct drm_connector_state *conn_state, + const struct drm_display_info *info) +{ + u32 rate_n = crtc_state->vrr_state.vrr_min_n; + u32 rate_d = crtc_state->vrr_state.vrr_min_d; + u32 min_rate_n, max_rate; + u32 g, i; + + if (conn_state->vrr_display_mode != VRR_DISPLAY_MODE_MEDIA) + return 0; + + if (!drm_crtc_helper_vrr_is_fixed_rate(&crtc_state->vrr_state)) + return -EINVAL; + + if (info->hdmi.vrr_cap.qms_tfr_min) + min_rate_n = 24000; + else + min_rate_n = info->hdmi.vrr_cap.vrr_min * 1000; + + if (info->hdmi.vrr_cap.qms_tfr_max) + max_rate = info->hdmi.vrr_cap.vrr_max; + else + max_rate = 60; + + g = gcd(rate_n, rate_d); + if (g != 1) { + rate_n /= g; + rate_d /= g; + } + + if (!rate_d) + return -EINVAL; + + for (i = 0; i < ARRAY_SIZE(hdmi_qms_tfrs); i++) { + if (cmp_fraction(min_rate_n, 1001, hdmi_qms_tfrs[i].rate_n, + hdmi_qms_tfrs[i].rate_d) > 0) + continue; + if (rate_n == hdmi_qms_tfrs[i].rate_n && + rate_d == hdmi_qms_tfrs[i].rate_d && + cmp_fraction(rate_n, rate_d, max_rate, 1) <= 0) + return hdmi_qms_tfrs[i].tfr_byte; + } + + return -EINVAL; +} + static int hdmi_calculate_vtotal(const struct drm_display_mode *mode, u32 rate_n, u32 rate_d, u16 *out_vtotal, u32 *out_denom, u32 *out_frame_err) @@ -1129,8 +1210,17 @@ static int hdmi_validate_vrr(struct drm_connector *connector, if (old_conn_state) old_crtc_state = drm_atomic_get_old_crtc_state(state, old_conn_state->crtc); - if (!info->hdmi.vrr_cap.supported) - return -EOPNOTSUPP; + switch (new_conn_state->vrr_display_mode) { + case VRR_DISPLAY_MODE_GAME: + if (!info->hdmi.vrr_cap.supported) + return -EOPNOTSUPP; + break; + case VRR_DISPLAY_MODE_MEDIA: + if (!info->hdmi.vrr_cap.qms_capable || + !connector->hdmi.qms_supported) + return -EOPNOTSUPP; + break; + } mode_refresh = drm_mode_vrefresh(mode); @@ -1145,7 +1235,10 @@ static int hdmi_validate_vrr(struct drm_connector *connector, max_vfreq_n = mode_refresh; is_fixed = drm_crtc_helper_vrr_is_fixed_rate(vrr_state); - if (is_fixed && info->hdmi.vrr_cap.cinema_vrr) + if (is_fixed && ((info->hdmi.vrr_cap.qms_tfr_min && + new_conn_state->vrr_display_mode == VRR_DISPLAY_MODE_MEDIA && + connector->hdmi.qms_supported && info->hdmi.vrr_cap.qms_capable) || + info->hdmi.vrr_cap.cinema_vrr)) min_vfreq_n = 24; /* If the VRR target changed, make sure to reset the error accumulator */ @@ -1176,6 +1269,19 @@ static int hdmi_validate_vrr(struct drm_connector *connector, return ret; } + ret = hdmi_validate_qms(new_crtc_state, new_conn_state, info); + if (ret < 0) { + drm_dbg_kms(dev, "Invalid QMS rate: %pe\n", ERR_PTR(ret)); + return ret; + } + + new_conn_state->hdmi.qms_tfr_byte = ret; + if (!old_conn_state || + new_conn_state->hdmi.qms_tfr_byte != old_conn_state->hdmi.qms_tfr_byte) + vrr_state->dynamic = true; + else + vrr_state->dynamic = false; + if (!is_fixed) { vrr_state->dynamic = true; -- 2.56.0