drm/msm/dp: Refactor ioremap wrapper

In order to deal with multiple memory ranges in the following commit
change the ioremap wrapper to not poke directly into the dss_io_data
struct.

While at it, devm_ioremap_resource() already prints useful error
messages on failure, so omit the unnecessary prints from the caller.
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/20211001174400.981707-4-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

@@ -19,40 +19,27 @@ static const struct dp_regulator_cfg sdm845_dp_reg_cfg = {
 	},
 };
 
-static int msm_dss_ioremap(struct platform_device *pdev,
-				struct dss_io_data *io_data)
+static void __iomem *dp_ioremap(struct platform_device *pdev, int idx, size_t *len)
 {
-	struct resource *res = NULL;
+	struct resource *res;
+	void __iomem *base;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		DRM_ERROR("%pS->%s: msm_dss_get_res failed\n",
-			__builtin_return_address(0), __func__);
-		return -ENODEV;
-	}
-
-	io_data->len = (u32)resource_size(res);
-	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__);
-		return -EIO;
-	}
+	base = devm_platform_get_and_ioremap_resource(pdev, idx, &res);
+	if (!IS_ERR(base))
+		*len = resource_size(res);
 
-	return 0;
+	return base;
 }
 
 static int dp_parser_ctrl_res(struct dp_parser *parser)
 {
-	int rc = 0;
 	struct platform_device *pdev = parser->pdev;
 	struct dp_io *io = &parser->io;
+	struct dss_io_data *dss = &io->dp_controller;
 
-	rc = msm_dss_ioremap(pdev, &io->dp_controller);
-	if (rc) {
-		DRM_ERROR("unable to remap dp io resources, rc=%d\n", rc);
-		return rc;
-	}
+	dss->base = dp_ioremap(pdev, 0, &dss->len);
+	if (IS_ERR(dss->base))
+		return PTR_ERR(dss->base);
 
 	io->phy = devm_phy_get(&pdev->dev, "dp");
 	if (IS_ERR(io->phy))

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

@@ -26,7 +26,7 @@ enum dp_pm_type {
 };
 
 struct dss_io_data {
-	u32 len;
+	size_t len;
 	void __iomem *base;
 };