linux-kernel - [PATCH v2 2/2] mmc: mtk-sd: Limit getting top

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Message-ID: <20241210073212.3917912-3-wenst@chromium.org>
Date: Tue, 10 Dec 2024 15:32:11 +0800
From: Chen-Yu Tsai <wenst@...omium.org>
To: Chaotian Jing <chaotian.jing@...iatek.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Wenbin Mei <wenbin.mei@...iatek.com>
Cc: Chen-Yu Tsai <wenst@...omium.org>,
	linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	devicetree@...r.kernel.org,
	Frank Wunderlich <frank-w@...lic-files.de>,
	Andy-ld Lu <andy-ld.lu@...iatek.com>
Subject: [PATCH v2 2/2] mmc: mtk-sd: Limit getting top_base to SoCs that require it

Currently the mtk-sd driver tries to get and map the second register
base, named top_base in the code, regardless of whether the SoC model
actually has it or not. This produces confusing big error messages on
the platforms that don't need it:

    mtk-msdc 11260000.mmc: error -EINVAL: invalid resource (null)

Limit it to the platforms that actually require it, based on their
device tree entries, and properly fail if it is missing.

Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
---
 drivers/mmc/host/mtk-sd.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index e2c385853eef..1bb7044f4ca1 100644
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -414,6 +414,7 @@ struct mtk_mmc_compatible {
 	u8 clk_div_bits;
 	bool recheck_sdio_irq;
 	bool hs400_tune; /* only used for MT8173 */
+	bool needs_top_base;
 	u32 pad_tune_reg;
 	bool async_fifo;
 	bool data_tune;
@@ -587,6 +588,7 @@ static const struct mtk_mmc_compatible mt7986_compat = {
 	.clk_div_bits = 12,
 	.recheck_sdio_irq = true,
 	.hs400_tune = false,
+	.needs_top_base = true,
 	.pad_tune_reg = MSDC_PAD_TUNE0,
 	.async_fifo = true,
 	.data_tune = true,
@@ -627,6 +629,7 @@ static const struct mtk_mmc_compatible mt8183_compat = {
 	.clk_div_bits = 12,
 	.recheck_sdio_irq = false,
 	.hs400_tune = false,
+	.needs_top_base = true,
 	.pad_tune_reg = MSDC_PAD_TUNE0,
 	.async_fifo = true,
 	.data_tune = true,
@@ -653,6 +656,7 @@ static const struct mtk_mmc_compatible mt8196_compat = {
 	.clk_div_bits = 12,
 	.recheck_sdio_irq = false,
 	.hs400_tune = false,
+	.needs_top_base = true,
 	.pad_tune_reg = MSDC_PAD_TUNE0,
 	.async_fifo = true,
 	.data_tune = true,
@@ -2887,9 +2891,13 @@ static int msdc_drv_probe(struct platform_device *pdev)
 	if (IS_ERR(host->base))
 		return PTR_ERR(host->base);
 
-	host->top_base = devm_platform_ioremap_resource(pdev, 1);
-	if (IS_ERR(host->top_base))
-		host->top_base = NULL;
+	host->dev_comp = of_device_get_match_data(&pdev->dev);
+
+	if (host->dev_comp->needs_top_base) {
+		host->top_base = devm_platform_ioremap_resource(pdev, 1);
+		if (IS_ERR(host->top_base))
+			return PTR_ERR(host->top_base);
+	}
 
 	ret = mmc_regulator_get_supply(mmc);
 	if (ret)
@@ -2951,7 +2959,6 @@ static int msdc_drv_probe(struct platform_device *pdev)
 	msdc_of_property_parse(pdev, host);
 
 	host->dev = &pdev->dev;
-	host->dev_comp = of_device_get_match_data(&pdev->dev);
 	host->src_clk_freq = clk_get_rate(host->src_clk);
 	/* Set host parameters to mmc */
 	mmc->ops = &mt_msdc_ops;
-- 
2.47.0.338.g60cca15819-goog