linux-kernel - [PATCH v2 3/5] drm/msm/dp: Refactor ioremap wrapper

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Message-Id: <20210825222557.1499104-4-bjorn.andersson@linaro.org>
Date:   Wed, 25 Aug 2021 15:25:55 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Abhinav Kumar <abhinavk@...eaurora.org>
Cc:     Kuogee Hsieh <khsieh@...eaurora.org>,
        Tanmay Shah <tanmay@...eaurora.org>,
        Chandan Uddaraju <chandanu@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/5] 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@...aro.org>
---

Changes since v1:
- Dropped initialization of "res"
- Fixed devm_ioremap() return value check
- Dropped error prints (as devm_ioremap() already does that)

 drivers/gpu/drm/msm/dp/dp_parser.c | 30 ++++++++++--------------------
 drivers/gpu/drm/msm/dp/dp_parser.h |  2 +-
 2 files changed, 11 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_parser.c b/drivers/gpu/drm/msm/dp/dp_parser.c
index c064ced78278..215065336268 100644
--- a/drivers/gpu/drm/msm/dp/dp_parser.c
+++ b/drivers/gpu/drm/msm/dp/dp_parser.c
@@ -19,40 +19,30 @@ 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;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	res = platform_get_resource(pdev, IORESOURCE_MEM, idx);
 	if (!res) {
 		DRM_ERROR("%pS->%s: msm_dss_get_res failed\n",
 			__builtin_return_address(0), __func__);
-		return -ENODEV;
+		return ERR_PTR(-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;
-	}
-
-	return 0;
+	*len = resource_size(res);
+	return devm_ioremap_resource(&pdev->dev, res);
 }
 
 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))
diff --git a/drivers/gpu/drm/msm/dp/dp_parser.h b/drivers/gpu/drm/msm/dp/dp_parser.h
index 34b49628bbaf..dc62e70b1640 100644
--- a/drivers/gpu/drm/msm/dp/dp_parser.h
+++ b/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;
 };
 
-- 
2.29.2