drm/msm/dp: Use devres for ioremap()

The non-devres version of ioremap is used, which requires manual
cleanup. But the code paths leading here is mixed with other devres
users, so rely on this for ioremap as well to simplify the code.
Reviewed-by: Abhinav Kumar <abhinavk@codeaurora.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20211001174400.981707-3-bjorn.andersson@linaro.orgSigned-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/dp/dp_parser.c

@@ -32,7 +32,7 @@ static int msm_dss_ioremap(struct platform_device *pdev,
 	}
 
 	io_data->len = (u32)resource_size(res);
-	io_data->base = ioremap(res->start, io_data->len);
+	io_data->base = devm_ioremap(&pdev->dev, res->start, io_data->len);
 	if (!io_data->base) {
 		DRM_ERROR("%pS->%s: ioremap failed\n",
 			__builtin_return_address(0), __func__);
@@ -42,22 +42,6 @@ static int msm_dss_ioremap(struct platform_device *pdev,
 	return 0;
 }
 
-static void msm_dss_iounmap(struct dss_io_data *io_data)
-{
-	if (io_data->base) {
-		iounmap(io_data->base);
-		io_data->base = NULL;
-	}
-	io_data->len = 0;
-}
-
-static void dp_parser_unmap_io_resources(struct dp_parser *parser)
-{
-	struct dp_io *io = &parser->io;
-
-	msm_dss_iounmap(&io->dp_controller);
-}
-
 static int dp_parser_ctrl_res(struct dp_parser *parser)
 {
 	int rc = 0;
@@ -67,19 +51,14 @@ static int dp_parser_ctrl_res(struct dp_parser *parser)
 	rc = msm_dss_ioremap(pdev, &io->dp_controller);
 	if (rc) {
 		DRM_ERROR("unable to remap dp io resources, rc=%d\n", rc);
-		goto err;
+		return rc;
 	}
 
 	io->phy = devm_phy_get(&pdev->dev, "dp");
-	if (IS_ERR(io->phy)) {
-		rc = PTR_ERR(io->phy);
-		goto err;
-	}
+	if (IS_ERR(io->phy))
+		return PTR_ERR(io->phy);
 
 	return 0;
-err:
-	dp_parser_unmap_io_resources(parser);
-	return rc;
 }
 
 static int dp_parser_misc(struct dp_parser *parser)