drm/amdgpu: convert bios_hardcoded_edid to drm_edid

Instead of manually passing around 'struct edid *' and its size,
use 'struct drm_edid', which encapsulates a validated combination of
both.

As the drm_edid_ can handle NULL gracefully, the explicit checks can be
dropped.

Also save a few characters by transforming '&array[0]' to the equivalent
'array' and using 'max_t(int, ...)' instead of manual casts.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c

@@ -249,11 +249,7 @@ amdgpu_connector_find_encoder(struct drm_connector *connector,
 static struct edid *
 amdgpu_connector_get_hardcoded_edid(struct amdgpu_device *adev)
 {
-	if (adev->mode_info.bios_hardcoded_edid) {
-		return kmemdup((unsigned char *)adev->mode_info.bios_hardcoded_edid,
-			       adev->mode_info.bios_hardcoded_edid_size, GFP_KERNEL);
-	}
-	return NULL;
+	return drm_edid_duplicate(drm_edid_raw(adev->mode_info.bios_hardcoded_edid));
 }
 
 static void amdgpu_connector_get_edid(struct drm_connector *connector)

drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h

@@ -51,6 +51,7 @@ struct amdgpu_encoder;
 struct amdgpu_router;
 struct amdgpu_hpd;
 struct edid;
+struct drm_edid;
 
 #define to_amdgpu_crtc(x) container_of(x, struct amdgpu_crtc, base)
 #define to_amdgpu_connector(x) container_of(x, struct amdgpu_connector, base)
@@ -326,8 +327,7 @@ struct amdgpu_mode_info {
 	/* FMT dithering */
 	struct drm_property *dither_property;
 	/* hardcoded DFP edid from BIOS */
-	struct edid *bios_hardcoded_edid;
-	int bios_hardcoded_edid_size;
+	const struct drm_edid *bios_hardcoded_edid;
 
 	/* firmware flags */
 	u32 firmware_flags;

drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c

@@ -549,7 +549,7 @@ static int amdgpu_vkms_sw_fini(void *handle)
 
 	adev->mode_info.mode_config_initialized = false;
 
-	kfree(adev->mode_info.bios_hardcoded_edid);
+	drm_edid_free(adev->mode_info.bios_hardcoded_edid);
 	kfree(adev->amdgpu_vkms_output);
 	return 0;
 }

drivers/gpu/drm/amd/amdgpu/atombios_encoders.c

@@ -2064,23 +2064,18 @@ amdgpu_atombios_encoder_get_lcd_info(struct amdgpu_encoder *encoder)
 				case LCD_FAKE_EDID_PATCH_RECORD_TYPE:
 					fake_edid_record = (ATOM_FAKE_EDID_PATCH_RECORD *)record;
 					if (fake_edid_record->ucFakeEDIDLength) {
-						struct edid *edid;
+						const struct drm_edid *edid;
 						int edid_size;
 
 						if (fake_edid_record->ucFakeEDIDLength == 128)
 							edid_size = fake_edid_record->ucFakeEDIDLength;
 						else
 							edid_size = fake_edid_record->ucFakeEDIDLength * 128;
-						edid = kmemdup(&fake_edid_record->ucFakeEDIDString[0],
-							       edid_size, GFP_KERNEL);
-						if (edid) {
-							if (drm_edid_is_valid(edid)) {
-								adev->mode_info.bios_hardcoded_edid = edid;
-								adev->mode_info.bios_hardcoded_edid_size = edid_size;
-							} else {
-								kfree(edid);
-							}
-						}
+						edid = drm_edid_alloc(fake_edid_record->ucFakeEDIDString, edid_size);
+						if (drm_edid_valid(edid))
+							adev->mode_info.bios_hardcoded_edid = edid;
+						else
+							drm_edid_free(edid);
 						record += struct_size(fake_edid_record,
 								      ucFakeEDIDString,
 								      edid_size);

drivers/gpu/drm/amd/amdgpu/dce_v10_0.c

@@ -2846,7 +2846,7 @@ static int dce_v10_0_sw_fini(void *handle)
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 
-	kfree(adev->mode_info.bios_hardcoded_edid);
+	drm_edid_free(adev->mode_info.bios_hardcoded_edid);
 
 	drm_kms_helper_poll_fini(adev_to_drm(adev));
 

drivers/gpu/drm/amd/amdgpu/dce_v11_0.c

@@ -2973,7 +2973,7 @@ static int dce_v11_0_sw_fini(void *handle)
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 
-	kfree(adev->mode_info.bios_hardcoded_edid);
+	drm_edid_free(adev->mode_info.bios_hardcoded_edid);
 
 	drm_kms_helper_poll_fini(adev_to_drm(adev));
 

drivers/gpu/drm/amd/amdgpu/dce_v6_0.c

@@ -2745,7 +2745,7 @@ static int dce_v6_0_sw_fini(void *handle)
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 
-	kfree(adev->mode_info.bios_hardcoded_edid);
+	drm_edid_free(adev->mode_info.bios_hardcoded_edid);
 
 	drm_kms_helper_poll_fini(adev_to_drm(adev));
 

drivers/gpu/drm/amd/amdgpu/dce_v8_0.c

@@ -2766,7 +2766,7 @@ static int dce_v8_0_sw_fini(void *handle)
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 
-	kfree(adev->mode_info.bios_hardcoded_edid);
+	drm_edid_free(adev->mode_info.bios_hardcoded_edid);
 
 	drm_kms_helper_poll_fini(adev_to_drm(adev));