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[62.151.111.63]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48e8f442129sm17673625e9.28.2026.05.12.06.22.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 12 May 2026 06:22:40 -0700 (PDT) From: Javier Martinez Canillas To: linux-kernel@vger.kernel.org Cc: Javier Martinez Canillas , Andrzej Hajda , David Airlie , Jernej Skrabec , Jonas Karlman , Laurent Pinchart , Luca Ceresoli , Maarten Lankhorst , Maxime Ripard , Neil Armstrong , Phong LE , Robert Foss , Simona Vetter , Thomas Zimmermann , dri-devel@lists.freedesktop.org Subject: [PATCH v3 1/2] drm/bridge: ite-it66121: Set TX mode in the .atomic_enable callback Date: Tue, 12 May 2026 15:22:15 +0200 Message-ID: <20260512132232.333654-2-javierm@redhat.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260512132232.333654-1-javierm@redhat.com> References: <20260512132232.333654-1-javierm@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The HDMI transmission mode set and AVI infoframes enable are done in the .mode_set callback, but it is more correct to do this in .atomic_enable. Because the information about the sink type is in the struct drm_connector display_info.is_hdmi and this might not be available when the .mode_set callback is executed. Currently the driver is not checking display info to determine whether the mode has to be set to HDMI or DVI, but this is a bug that will be fixed by a follow-up change. Signed-off-by: Javier Martinez Canillas --- (no changes since v1) drivers/gpu/drm/bridge/ite-it66121.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/drivers/gpu/drm/bridge/ite-it66121.c b/drivers/gpu/drm/bridge/= ite-it66121.c index 19a027d75b61..648ca50712df 100644 --- a/drivers/gpu/drm/bridge/ite-it66121.c +++ b/drivers/gpu/drm/bridge/ite-it66121.c @@ -669,6 +669,22 @@ static int it66121_set_mute(struct it66121_ctx *ctx, b= ool mute) IT66121_PKT_GEN_CTRL_ON | IT66121_PKT_GEN_CTRL_RPT); } =20 +static void it66121_set_tx_mode(struct it66121_ctx *ctx) +{ + mutex_lock(&ctx->lock); + + /* Enable AVI infoframe */ + if (regmap_write(ctx->regmap, IT66121_AVI_INFO_PKT_REG, + IT66121_AVI_INFO_PKT_ON | IT66121_AVI_INFO_PKT_RPT)) + goto unlock; + + /* Set TX mode to HDMI */ + regmap_write(ctx->regmap, IT66121_HDMI_MODE_REG, IT66121_HDMI_MODE_HDMI); + +unlock: + mutex_unlock(&ctx->lock); +} + #define MAX_OUTPUT_SEL_FORMATS 1 =20 static u32 *it66121_bridge_atomic_get_output_bus_fmts(struct drm_bridge *b= ridge, @@ -729,6 +745,8 @@ static void it66121_bridge_enable(struct drm_bridge *br= idge, ctx->connector =3D drm_atomic_get_new_connector_for_encoder(state, bridge= ->encoder); 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[62.151.111.63]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-45491304387sm31943745f8f.21.2026.05.12.06.22.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 12 May 2026 06:22:44 -0700 (PDT) From: Javier Martinez Canillas To: linux-kernel@vger.kernel.org Cc: Javier Martinez Canillas , Andrzej Hajda , David Airlie , Jernej Skrabec , Jonas Karlman , Laurent Pinchart , Luca Ceresoli , Maarten Lankhorst , Maxime Ripard , Neil Armstrong , Phong LE , Robert Foss , Simona Vetter , Thomas Zimmermann , dri-devel@lists.freedesktop.org Subject: [PATCH v3 2/2] drm/bridge: ite-it66121: Select HDMI or DVI mode based on sink type Date: Tue, 12 May 2026 15:22:16 +0200 Message-ID: <20260512132232.333654-3-javierm@redhat.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260512132232.333654-1-javierm@redhat.com> References: <20260512132232.333654-1-javierm@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The driver assumes that the sink type is always HDMI and unconditionally configures the bridge in this mode and enables the transmission of AVI infoframe packets. But this cause issues with DVI monitors, that can fail to interpret the video signal and lead to not having any display output. Check the connector display information sink type to decide whether DVI or HDMI mode should be set and if the AVI infoframes packets should be sent. Signed-off-by: Javier Martinez Canillas --- Changes in v3: - Move the HDMI/DVI mode set to the .atomic_enable handler (Maxime Ripard). Changes in v2: - Don't store the sink type in a per-commit bridge state (Maxime Ripard). drivers/gpu/drm/bridge/ite-it66121.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/bridge/ite-it66121.c b/drivers/gpu/drm/bridge/= ite-it66121.c index 648ca50712df..94fd513481b5 100644 --- a/drivers/gpu/drm/bridge/ite-it66121.c +++ b/drivers/gpu/drm/bridge/ite-it66121.c @@ -182,6 +182,7 @@ =20 #define IT66121_HDMI_MODE_REG 0xC0 #define IT66121_HDMI_MODE_HDMI BIT(0) +#define IT66121_HDMI_MODE_DVI 0 =20 #define IT66121_SYS_STATUS_REG 0x0E #define IT66121_SYS_STATUS_ACTIVE_IRQ BIT(7) @@ -671,15 +672,23 @@ static int it66121_set_mute(struct it66121_ctx *ctx, = bool mute) =20 static void it66121_set_tx_mode(struct it66121_ctx *ctx) { + unsigned int avi_pkt =3D 0; + unsigned int mode =3D IT66121_HDMI_MODE_DVI; + struct drm_connector *connector =3D ctx->connector; + + if (connector->display_info.is_hdmi) { + mode =3D IT66121_HDMI_MODE_HDMI; + avi_pkt =3D IT66121_AVI_INFO_PKT_ON | IT66121_AVI_INFO_PKT_RPT; + } + mutex_lock(&ctx->lock); =20 - /* Enable AVI infoframe */ - if (regmap_write(ctx->regmap, IT66121_AVI_INFO_PKT_REG, - IT66121_AVI_INFO_PKT_ON | IT66121_AVI_INFO_PKT_RPT)) + /* Enable or disable AVI infoframe */ + if (regmap_write(ctx->regmap, IT66121_AVI_INFO_PKT_REG, avi_pkt)) goto unlock; =20 - /* Set TX mode to HDMI */ - regmap_write(ctx->regmap, IT66121_HDMI_MODE_REG, IT66121_HDMI_MODE_HDMI); + /* Set TX mode to DVI or HDMI */ + regmap_write(ctx->regmap, IT66121_HDMI_MODE_REG, mode); =20 unlock: mutex_unlock(&ctx->lock); --=20 2.54.0