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(unknown [61.154.14.86]) by smtp.qiye.163.com (Hmail) with ESMTP id 48b4fff2e; Tue, 4 Aug 2026 16:17:35 +0800 (GMT+08:00) From: Damon Ding To: Andrzej Hajda , Neil Armstrong , Robert Foss , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Heiko Stuebner , Andy Yan Cc: Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Luca Ceresoli , Dmitry Baryshkov , Marek Szyprowski , Sebastian Reichel , dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org, Damon Ding Subject: [PATCH v2 10/10] drm/bridge: analogix_dp: Handle HPD notification from downstream bridge Date: Tue, 4 Aug 2026 16:17:17 +0800 Message-Id: <20260804081717.741404-11-damon.ding@rock-chips.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260804081717.741404-1-damon.ding@rock-chips.com> References: <20260804081717.741404-1-damon.ding@rock-chips.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-HM-Tid: 0a9fcbd97bed03a8kunma7b8cbe762b0fd X-HM-MType: 1 X-HM-Spam-Status: e1kfGhgUHx5ZQUpXWQgPGg8OCBgUHx5ZQUlOS1dZFg8aDwILHllBWSg2Ly tZV1koWUFITzdXWRgWCB1ZQUpXWS1ZQUlXWQ8JGhUIEh9ZQVlCHRpDVhpKTB1NSBkeGBhCTVYVFA kWGhdVEwETFhoSFyQUDg9ZV1kYEgtZQVlNSlVKTk9VSk9VQ01ZV1kWGg8SFR0UWUFZT0tIVUpLSU 9PT0hVSktLVUpCS0tZBg++ DKIM-Signature: a=rsa-sha256; b=SohnfUmi0MZZEoAoDsZj4vPpj0X0DbQuo4zvxtT26IBgh1dIdNilNr6K5vn773a7/9DDuE9+7RowCZoyy88k4FreVSgDOL4RJO4F7NkhijLqAu4OLzholJq7wh5HuRfyMDm1MCBnf+bXvqoepyUHq8os4msiCivz/uh6DCff1tg=; c=relaxed/relaxed; s=default; d=rock-chips.com; v=1; bh=ihFySqm5GnqPJHRcWS06V+nd4nWFCQ2/QSaKuoAhvMM=; h=date:mime-version:subject:message-id:from; X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260804_011742_154053_A604E953 X-CRM114-Status: GOOD ( 14.22 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org When the display pipeline includes a display-connector bridge with hpd-gpios configured, the connector's hotplug status is managed by the display-connector bridge through its GPIO, not by the Analogix DP controller's native HPD. In this configuration, the DP controller's internal HPD polling in analogix_dp_detect_hpd() does not reflect the actual connection state. Implement the .hpd_notify bridge callback to receive connection status updates from downstream bridges. Cache the connection status in a connection_notified flag, and use it to short-circuit analogix_dp_detect_hpd() when a downstream bridge has already confirmed the connection. Signed-off-by: Damon Ding --- .../gpu/drm/bridge/analogix/analogix_dp_core.c | 16 ++++++++++++++++ .../gpu/drm/bridge/analogix/analogix_dp_core.h | 1 + 2 files changed, 17 insertions(+) diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c index a5a50b9ab8a7..f0476a60ece3 100644 --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c @@ -68,6 +68,13 @@ static int analogix_dp_detect_hpd(struct analogix_dp_device *dp) { int timeout_loop = 0; + /* + * Trust connection status from downstream bridge (e.g., + * display-connector with hpd-gpios). + */ + if (dp->plat_data->next_bridge && dp->connection_notified) + return 0; + while (timeout_loop < DP_TIMEOUT_LOOP_COUNT) { if (analogix_dp_get_plug_in_status(dp) == 0) return 0; @@ -1247,6 +1254,14 @@ static void analogix_dp_bridge_atomic_post_disable(struct drm_bridge *bridge, DRM_ERROR("Failed to enable psr (%d)\n", ret); } +static void analogix_dp_bridge_notify(struct drm_bridge *bridge, struct drm_connector *connector, + enum drm_connector_status status) +{ + struct analogix_dp_device *dp = to_dp(bridge); + + dp->connection_notified = (status == connector_status_connected); +} + static const struct drm_bridge_funcs analogix_dp_bridge_funcs = { .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state, @@ -1259,6 +1274,7 @@ static const struct drm_bridge_funcs analogix_dp_bridge_funcs = { .attach = analogix_dp_bridge_attach, .edid_read = analogix_dp_bridge_edid_read, .detect = analogix_dp_bridge_detect, + .hpd_notify = analogix_dp_bridge_notify, }; static int analogix_dp_dt_parse_pdata(struct analogix_dp_device *dp) diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h index bcb5674801a2..cd8a5d52f973 100644 --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h @@ -169,6 +169,7 @@ struct analogix_dp_device { bool fast_train_enable; bool psr_supported; bool last_bridge_is_panel; + bool connection_notified; u8 dpcd[DP_RECEIVER_CAP_SIZE]; -- 2.34.1