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From: Mario Limonciello <mario.limonciello@amd.com>
To: Daniel Vetter <daniel@ffwll.ch>, Jani Nikula
	<jani.nikula@linux.intel.com>, Alex Deucher <alexander.deucher@amd.com>,
	"Hans de Goede" <hdegoede@redhat.com>, "open list:DRM DRIVERS"
	<dri-devel@lists.freedesktop.org>
CC: <amd-gfx@lists.freedesktop.org>, "open list:USB SUBSYSTEM"
	<linux-usb@vger.kernel.org>, <linux-fbdev@vger.kernel.org>,
	<nouveau@lists.freedesktop.org>, <intel-gfx@lists.freedesktop.org>,
	<platform-driver-x86@vger.kernel.org>, <intel-xe@lists.freedesktop.org>,
	<linux-renesas-soc@vger.kernel.org>, "open list:ACPI"
	<linux-acpi@vger.kernel.org>, open list <linux-kernel@vger.kernel.org>,
	Melissa Wen <mwen@igalia.com>, Mark Pearson <mpearson-lenovo@squebb.ca>,
	Mario Limonciello <mario.limonciello@amd.com>
Subject: [PATCH v6 5/5] drm/nouveau: Use drm_edid_read_acpi() helper
Date: Wed, 14 Feb 2024 15:57:56 -0600
Message-ID: <20240214215756.6530-6-mario.limonciello@amd.com>
In-Reply-To: <20240214215756.6530-1-mario.limonciello@amd.com>
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Rather than inventing a wrapper to acpi_video_get_edid() use the
one provided by drm. This fixes two problems:
1. A memory leak that the memory provided by the ACPI call was
   never freed.
2. Validation of the BIOS provided blob.

Convert the usage in nouveau_connector_detect_lvds() to use
struct drm_edid at the same time.

Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
---
 drivers/gpu/drm/nouveau/nouveau_acpi.c      | 27 ----------------
 drivers/gpu/drm/nouveau/nouveau_acpi.h      |  2 --
 drivers/gpu/drm/nouveau/nouveau_connector.c | 35 +++++++++------------
 3 files changed, 14 insertions(+), 50 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_acpi.c b/drivers/gpu/drm/nouveau/nouveau_acpi.c
index 8f0c69aad248..de9daafb3fbb 100644
--- a/drivers/gpu/drm/nouveau/nouveau_acpi.c
+++ b/drivers/gpu/drm/nouveau/nouveau_acpi.c
@@ -360,33 +360,6 @@ void nouveau_unregister_dsm_handler(void) {}
 void nouveau_switcheroo_optimus_dsm(void) {}
 #endif
 
-void *
-nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
-{
-	struct acpi_device *acpidev;
-	int type, ret;
-	void *edid;
-
-	switch (connector->connector_type) {
-	case DRM_MODE_CONNECTOR_LVDS:
-	case DRM_MODE_CONNECTOR_eDP:
-		type = ACPI_VIDEO_DISPLAY_LCD;
-		break;
-	default:
-		return NULL;
-	}
-
-	acpidev = ACPI_COMPANION(dev->dev);
-	if (!acpidev)
-		return NULL;
-
-	ret = acpi_video_get_edid(acpidev, type, -1, &edid);
-	if (ret < 0)
-		return NULL;
-
-	return kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
-}
-
 bool nouveau_acpi_video_backlight_use_native(void)
 {
 	return acpi_video_backlight_use_native();
diff --git a/drivers/gpu/drm/nouveau/nouveau_acpi.h b/drivers/gpu/drm/nouveau/nouveau_acpi.h
index e39dd8b94b8b..6a3def8e6cca 100644
--- a/drivers/gpu/drm/nouveau/nouveau_acpi.h
+++ b/drivers/gpu/drm/nouveau/nouveau_acpi.h
@@ -10,7 +10,6 @@ bool nouveau_is_v1_dsm(void);
 void nouveau_register_dsm_handler(void);
 void nouveau_unregister_dsm_handler(void);
 void nouveau_switcheroo_optimus_dsm(void);
-void *nouveau_acpi_edid(struct drm_device *, struct drm_connector *);
 bool nouveau_acpi_video_backlight_use_native(void);
 void nouveau_acpi_video_register_backlight(void);
 #else
@@ -19,7 +18,6 @@ static inline bool nouveau_is_v1_dsm(void) { return false; };
 static inline void nouveau_register_dsm_handler(void) {}
 static inline void nouveau_unregister_dsm_handler(void) {}
 static inline void nouveau_switcheroo_optimus_dsm(void) {}
-static inline void *nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector) { return NULL; }
 static inline bool nouveau_acpi_video_backlight_use_native(void) { return true; }
 static inline void nouveau_acpi_video_register_backlight(void) {}
 #endif
diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
index 856b3ef5edb8..492035dc8453 100644
--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
@@ -687,22 +687,13 @@ nouveau_connector_detect_lvds(struct drm_connector *connector, bool force)
 	struct nouveau_drm *drm = nouveau_drm(dev);
 	struct nouveau_connector *nv_connector = nouveau_connector(connector);
 	struct nouveau_encoder *nv_encoder = NULL;
-	struct edid *edid = NULL;
+	const struct drm_edid *drm_edid = NULL;
 	enum drm_connector_status status = connector_status_disconnected;
 
 	nv_encoder = find_encoder(connector, DCB_OUTPUT_LVDS);
 	if (!nv_encoder)
 		goto out;
 
-	/* Try retrieving EDID via DDC */
-	if (!drm->vbios.fp_no_ddc) {
-		status = nouveau_connector_detect(connector, force);
-		if (status == connector_status_connected) {
-			edid = nv_connector->edid;
-			goto out;
-		}
-	}
-
 	/* On some laptops (Sony, i'm looking at you) there appears to
 	 * be no direct way of accessing the panel's EDID.  The only
 	 * option available to us appears to be to ask ACPI for help..
@@ -712,10 +703,14 @@ nouveau_connector_detect_lvds(struct drm_connector *connector, bool force)
 	 * the nouveau decides an entry in the VBIOS FP mode table is
 	 * valid - it's not (rh#613284)
 	 */
-	if (nv_encoder->dcb->lvdsconf.use_acpi_for_edid) {
-		edid = nouveau_acpi_edid(dev, connector);
-		if (edid) {
-			status = connector_status_connected;
+	if (nv_encoder->dcb->lvdsconf.use_acpi_for_edid)
+		connector->acpi_edid_allowed = true;
+
+	/* Try retrieving EDID via BIOS or DDC */
+	if (!drm->vbios.fp_no_ddc || nv_encoder->dcb->lvdsconf.use_acpi_for_edid) {
+		status = nouveau_connector_detect(connector, force);
+		if (status == connector_status_connected) {
+			drm_edid = drm_edid_alloc(nv_connector->edid, EDID_LENGTH);
 			goto out;
 		}
 	}
@@ -734,12 +729,9 @@ nouveau_connector_detect_lvds(struct drm_connector *connector, bool force)
 	 * stored for the panel stored in them.
 	 */
 	if (!drm->vbios.fp_no_ddc) {
-		edid = (struct edid *)nouveau_bios_embedded_edid(dev);
-		if (edid) {
-			edid = kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
-			if (edid)
-				status = connector_status_connected;
-		}
+		drm_edid = drm_edid_alloc(nouveau_bios_embedded_edid(dev), EDID_LENGTH);
+		if (drm_edid)
+			status = connector_status_connected;
 	}
 
 out:
@@ -750,7 +742,8 @@ nouveau_connector_detect_lvds(struct drm_connector *connector, bool force)
 		status = connector_status_unknown;
 #endif
 
-	nouveau_connector_set_edid(nv_connector, edid);
+	drm_edid_connector_update(connector, drm_edid);
+	drm_edid_free(drm_edid);
 	if (nv_encoder)
 		nouveau_connector_set_encoder(connector, nv_encoder);
 	return status;
-- 
2.34.1