drm/ast: Remove unused value dp501_maxclk

Remove reading the link-rate. The value is maintained by the connector
code but never used.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220207141544.30015-5-tzimmermann@suse.de

drivers/gpu/drm/ast/ast_dp501.c

@@ -272,64 +272,6 @@ static bool ast_launch_m68k(struct drm_device *dev)
 	return true;
 }
 
-u8 ast_get_dp501_max_clk(struct drm_device *dev)
-{
-	struct ast_private *ast = to_ast_private(dev);
-	u32 boot_address, offset, data;
-	u8 linkcap[4], linkrate, linklanes, maxclk = 0xff;
-	u32 *plinkcap;
-
-	if (ast->config_mode == ast_use_p2a) {
-		boot_address = get_fw_base(ast);
-
-		/* validate FW version */
-		offset = AST_DP501_GBL_VERSION;
-		data = ast_mindwm(ast, boot_address + offset);
-		if ((data & AST_DP501_FW_VERSION_MASK) != AST_DP501_FW_VERSION_1) /* version: 1x */
-			return maxclk;
-
-		/* Read Link Capability */
-		offset  = AST_DP501_LINKRATE;
-		plinkcap = (u32 *)linkcap;
-		*plinkcap  = ast_mindwm(ast, boot_address + offset);
-		if (linkcap[2] == 0) {
-			linkrate = linkcap[0];
-			linklanes = linkcap[1];
-			data = (linkrate == 0x0a) ? (90 * linklanes) : (54 * linklanes);
-			if (data > 0xff)
-				data = 0xff;
-			maxclk = (u8)data;
-		}
-	} else {
-		if (!ast->dp501_fw_buf)
-			return AST_DP501_DEFAULT_DCLK;	/* 1024x768 as default */
-
-		/* dummy read */
-		offset = 0x0000;
-		data = readl(ast->dp501_fw_buf + offset);
-
-		/* validate FW version */
-		offset = AST_DP501_GBL_VERSION;
-		data = readl(ast->dp501_fw_buf + offset);
-		if ((data & AST_DP501_FW_VERSION_MASK) != AST_DP501_FW_VERSION_1) /* version: 1x */
-			return maxclk;
-
-		/* Read Link Capability */
-		offset = AST_DP501_LINKRATE;
-		plinkcap = (u32 *)linkcap;
-		*plinkcap = readl(ast->dp501_fw_buf + offset);
-		if (linkcap[2] == 0) {
-			linkrate = linkcap[0];
-			linklanes = linkcap[1];
-			data = (linkrate == 0x0a) ? (90 * linklanes) : (54 * linklanes);
-			if (data > 0xff)
-				data = 0xff;
-			maxclk = (u8)data;
-		}
-	}
-	return maxclk;
-}
-
 bool ast_dp501_read_edid(struct drm_device *dev, u8 *ediddata)
 {
 	struct ast_private *ast = to_ast_private(dev);

drivers/gpu/drm/ast/ast_drv.h

@@ -171,7 +171,6 @@ struct ast_private {
 	} config_mode;
 
 	enum ast_tx_chip tx_chip_type;
-	u8 dp501_maxclk;
 	u8 *dp501_fw_addr;
 	const struct firmware *dp501_fw;	/* dp501 fw */
 };

drivers/gpu/drm/ast/ast_mode.c

@@ -1284,16 +1284,15 @@ static int ast_get_modes(struct drm_connector *connector)
 	int ret;
 
 	if (ast->tx_chip_type == AST_TX_DP501) {
-		ast->dp501_maxclk = 0xff;
 		edid = kmalloc(128, GFP_KERNEL);
 		if (!edid)
 			return -ENOMEM;
 
 		flags = ast_dp501_read_edid(connector->dev, (u8 *)edid);
-		if (flags)
-			ast->dp501_maxclk = ast_get_dp501_max_clk(connector->dev);
-		else
+		if (!flags) {
 			kfree(edid);
+			edid = NULL;
+		}
 	}
 	if (!flags && ast_connector->i2c)
 		edid = drm_get_edid(connector, &ast_connector->i2c->adapter);