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Mon, 13 Jul 2026 12:33:52 -0700 (PDT) Received: from timo-z13.fritz.box ([193.30.163.202]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-47f4634e0d9sm1912993f8f.2.2026.07.13.12.33.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 13 Jul 2026 12:33:52 -0700 (PDT) From: =?UTF-8?q?Timo=20Pr=C3=B6mer?= To: Harry Wentland , Leo Li , Alex Deucher , =?UTF-8?q?Christian=20K=C3=B6nig?= , David Airlie , Simona Vetter Cc: Rodrigo Siqueira , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Timoyoungster Subject: [PATCH v2 1/2] drm/edid: Export drm_edid_block_count() Date: Mon, 13 Jul 2026 21:32:36 +0200 Message-ID: <20260713193237.2639-2-timo.proemer04@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260713193237.2639-1-timo.proemer04@gmail.com> References: <20260713193237.2639-1-timo.proemer04@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Mailman-Approved-At: Mon, 13 Jul 2026 22:35:59 +0000 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Timoyoungster Drivers currently calculating EDID size by reading the `extensions` field of the raw EDID structure (e.g., `edid->extensions + 1`) will calculate the wrong size if the EDID contains an HF-EEODB (HDMI Forum EDID Extension Override Data Block). The base extension flag does not account for these override blocks, leading to truncated EDIDs. Remove the static declaration and export drm_edid_block_count() so drivers can safely query the true block count. This allows drivers to leverage the core DRM's proper handling of HF-EEODB and other edge cases without having to parse the raw EDID fields themselves. Signed-off-by: Timo Prömer --- drivers/gpu/drm/drm_edid.c | 3 ++- include/drm/drm_edid.h | 1 + 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index df3c25bac..34560b33a 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -1698,12 +1698,13 @@ static int __drm_edid_block_count(const struct drm_edid *drm_edid) } /* EDID block count, limited by allocated size */ -static int drm_edid_block_count(const struct drm_edid *drm_edid) +int drm_edid_block_count(const struct drm_edid *drm_edid) { /* Limit by allocated size */ return min(__drm_edid_block_count(drm_edid), (int)drm_edid->size / EDID_LENGTH); } +EXPORT_SYMBOL(drm_edid_block_count); /* EDID extension block count, limited by allocated size */ static int drm_edid_extension_block_count(const struct drm_edid *drm_edid) diff --git a/include/drm/drm_edid.h b/include/drm/drm_edid.h index 04f7a7f1f..4a990bf87 100644 --- a/include/drm/drm_edid.h +++ b/include/drm/drm_edid.h @@ -481,6 +481,7 @@ const struct drm_edid *drm_edid_read_switcheroo(struct drm_connector *connector, int drm_edid_connector_update(struct drm_connector *connector, const struct drm_edid *edid); int drm_edid_connector_add_modes(struct drm_connector *connector); +int drm_edid_block_count(const struct drm_edid *drm_edid); bool drm_edid_is_digital(const struct drm_edid *drm_edid); void drm_edid_get_product_id(const struct drm_edid *drm_edid, struct drm_edid_product_id *id); -- 2.55.0