drm/i2c: tda998x: use drm_do_get_edid()

Replace the internal EDID read implementation by a call to the new EDID
read core function.
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Tested-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

drivers/gpu/drm/i2c/tda998x_drv.c

@@ -1012,8 +1012,9 @@ tda998x_encoder_detect(struct tda998x_priv *priv)
 			connector_status_disconnected;
 }
 
-static int read_edid_block(struct tda998x_priv *priv, uint8_t *buf, int blk)
+static int read_edid_block(void *data, u8 *buf, unsigned int blk, size_t length)
 {
+	struct tda998x_priv *priv = data;
 	uint8_t offset, segptr;
 	int ret, i;
 
@@ -1057,8 +1058,8 @@ static int read_edid_block(struct tda998x_priv *priv, uint8_t *buf, int blk)
 		return -ETIMEDOUT;
 	}
 
-	ret = reg_read_range(priv, REG_EDID_DATA_0, buf, EDID_LENGTH);
-	if (ret != EDID_LENGTH) {
+	ret = reg_read_range(priv, REG_EDID_DATA_0, buf, length);
+	if (ret != length) {
 		dev_err(&priv->hdmi->dev, "failed to read edid block %d: %d\n",
 			blk, ret);
 		return ret;
@@ -1067,82 +1068,31 @@ static int read_edid_block(struct tda998x_priv *priv, uint8_t *buf, int blk)
 	return 0;
 }
 
-static uint8_t *do_get_edid(struct tda998x_priv *priv)
+static int
+tda998x_encoder_get_modes(struct tda998x_priv *priv,
+			  struct drm_connector *connector)
 {
-	int j, valid_extensions = 0;
-	uint8_t *block, *new;
-	bool print_bad_edid = drm_debug & DRM_UT_KMS;
-
-	if ((block = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL)
-		return NULL;
+	struct edid *edid;
+	int n;
 
 	if (priv->rev == TDA19988)
 		reg_clear(priv, REG_TX4, TX4_PD_RAM);
 
-	/* base block fetch */
-	if (read_edid_block(priv, block, 0))
-		goto fail;
-
-	if (!drm_edid_block_valid(block, 0, print_bad_edid))
-		goto fail;
-
-	/* if there's no extensions, we're done */
-	if (block[0x7e] == 0)
-		goto done;
-
-	new = krealloc(block, (block[0x7e] + 1) * EDID_LENGTH, GFP_KERNEL);
-	if (!new)
-		goto fail;
-	block = new;
-
-	for (j = 1; j <= block[0x7e]; j++) {
-		uint8_t *ext_block = block + (valid_extensions + 1) * EDID_LENGTH;
-		if (read_edid_block(priv, ext_block, j))
-			goto fail;
-
-		if (!drm_edid_block_valid(ext_block, j, print_bad_edid))
-			goto fail;
+	edid = drm_do_get_edid(connector, read_edid_block, priv);
 
-		valid_extensions++;
-	}
-
-	if (valid_extensions != block[0x7e]) {
-		block[EDID_LENGTH-1] += block[0x7e] - valid_extensions;
-		block[0x7e] = valid_extensions;
-		new = krealloc(block, (valid_extensions + 1) * EDID_LENGTH, GFP_KERNEL);
-		if (!new)
-			goto fail;
-		block = new;
-	}
-
-done:
 	if (priv->rev == TDA19988)
 		reg_set(priv, REG_TX4, TX4_PD_RAM);
 
-	return block;
-
-fail:
-	if (priv->rev == TDA19988)
-		reg_set(priv, REG_TX4, TX4_PD_RAM);
-	dev_warn(&priv->hdmi->dev, "failed to read EDID\n");
-	kfree(block);
-	return NULL;
-}
-
-static int
-tda998x_encoder_get_modes(struct tda998x_priv *priv,
-			  struct drm_connector *connector)
-{
-	struct edid *edid = (struct edid *)do_get_edid(priv);
-	int n = 0;
-
-	if (edid) {
-		drm_mode_connector_update_edid_property(connector, edid);
-		n = drm_add_edid_modes(connector, edid);
-		priv->is_hdmi_sink = drm_detect_hdmi_monitor(edid);
-		kfree(edid);
+	if (!edid) {
+		dev_warn(&priv->hdmi->dev, "failed to read EDID\n");
+		return 0;
 	}
 
+	drm_mode_connector_update_edid_property(connector, edid);
+	n = drm_add_edid_modes(connector, edid);
+	priv->is_hdmi_sink = drm_detect_hdmi_monitor(edid);
+	kfree(edid);
+
 	return n;
 }