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h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=NfFbgI3kA4+Q65M6Je4ReDh3D/9m4qlvbMgZN4BrBfILunmde6/e6mwTl+xW/Im67 IdsfWjqKTMNAXMznmPFuTlrKVsuCf33ufPbum31o0qqfuJQ9TttCSZgxMGM3UgD2ym sAdLPVw8CE5jBOtxZ7U8jsX/2r+IiZWrSML+CxOfWtrFis+UvghGeEhFTDa+tjeuTR U2kSeCd2J6H5cxJIMvLDXF9STHz0aCpdJlREP+BFDUtiXO7cYHv7AOAXHHRZyRjSF1 kQfewPV5S4m1A6lV5zPSeap06US5jSzVUiwQ1p3uEgH8oDigO4B+4BU0htC7Pgebp8 cmYaiSiNxx/2g== Received: from localhost (unknown [100.64.0.241]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange secp256r1 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: cristicc) by bali.collaboradmins.com (Postfix) with ESMTPSA id 3053217E1274; Thu, 23 Jul 2026 03:35:27 +0200 (CEST) From: Cristian Ciocaltea Date: Thu, 23 Jul 2026 04:35:25 +0300 Subject: [PATCH v9 36/61] drm/vc4: hdmi: Propagate -EDEADLK to the top level Precedence: bulk X-Mailing-List: linux-sunxi@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20260723-dw-hdmi-qp-scramb-v9-36-4fb12ea22ac9@collabora.com> References: <20260723-dw-hdmi-qp-scramb-v9-0-4fb12ea22ac9@collabora.com> In-Reply-To: <20260723-dw-hdmi-qp-scramb-v9-0-4fb12ea22ac9@collabora.com> To: Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Luca Ceresoli , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Chen-Yu Tsai , Samuel Holland , Dave Stevenson , =?utf-8?q?Ma=C3=ADra_Canal?= , Raspberry Pi Kernel Maintenance , Sandy Huang , =?utf-8?q?Heiko_St=C3=BCbner?= , Andy Yan , Algea Cao , Daniel Stone , Liu Ying , Phong LE Cc: kernel@collabora.com, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-rockchip@lists.infradead.org X-Mailer: b4 0.15.2 X-MORS-Enabled: yes X-MORS-DOMAIN: patchwork.local X-MORS-HOSTING: hosting172546 X-MORS-USER: hosting172546 X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= drm_connector_helper_funcs.detect_ctx() is expected to propagate -EDEADLK so that context owners, e.g. drm_helper_probe_detect_ctx(), can perform the required backoff and retry. vc4_hdmi_handle_hotplug() instead runs its own retry loop and calls drm_modeset_backoff() on an acquire context it does not own. This drops all locks in the context, including connection_mutex held by the core. Drop the local retry logic and propagate -EDEADLK to the caller instead. This aligns VC4 with the expected detect_ctx() semantics. Signed-off-by: Cristian Ciocaltea --- drivers/gpu/drm/vc4/vc4_hdmi.c | 23 +++++++---------------- 1 file changed, 7 insertions(+), 16 deletions(-) diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c index 4f7fc6689869..75a251530970 100644 --- a/drivers/gpu/drm/vc4/vc4_hdmi.c +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c @@ -344,12 +344,11 @@ static int vc4_hdmi_reset_link(struct drm_connector *connector, return drm_atomic_helper_reset_crtc(crtc, ctx); } -static void vc4_hdmi_handle_hotplug(struct vc4_hdmi *vc4_hdmi, - struct drm_modeset_acquire_ctx *ctx, - enum drm_connector_status status) +static int vc4_hdmi_handle_hotplug(struct vc4_hdmi *vc4_hdmi, + struct drm_modeset_acquire_ctx *ctx, + enum drm_connector_status status) { struct drm_connector *connector = &vc4_hdmi->connector; - int ret; /* * NOTE: This function should really be called with vc4_hdmi->mutex @@ -368,17 +367,9 @@ static void vc4_hdmi_handle_hotplug(struct vc4_hdmi *vc4_hdmi, drm_atomic_helper_connector_hdmi_hotplug(connector, ctx, status); if (status != connector_status_connected) - return; + return 0; - for (;;) { - ret = vc4_hdmi_reset_link(connector, ctx); - if (ret == -EDEADLK) { - drm_modeset_backoff(ctx); - continue; - } - - break; - } + return vc4_hdmi_reset_link(connector, ctx); } static int vc4_hdmi_connector_detect_ctx(struct drm_connector *connector, @@ -416,10 +407,10 @@ static int vc4_hdmi_connector_detect_ctx(struct drm_connector *connector, status = connector_status_connected; } - vc4_hdmi_handle_hotplug(vc4_hdmi, ctx, status); + ret = vc4_hdmi_handle_hotplug(vc4_hdmi, ctx, status); pm_runtime_put(&vc4_hdmi->pdev->dev); - return status; + return ret == -EDEADLK ? ret : status; } static int vc4_hdmi_connector_get_modes(struct drm_connector *connector)