linux-kernel - [PATCH v1] mmc: sdhci-of-dwcmshc: fix init for AXI clock and DMA 128MB boundary

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Message-Id: <20260109032810.204-1-hehuan1@eswincomputing.com>
Date: Fri,  9 Jan 2026 11:28:10 +0800
From: hehuan1@...incomputing.com
To: adrian.hunter@...el.com,
	ulf.hansson@...aro.org,
	linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: ningyu@...incomputing.com,
	linmin@...incomputing.com,
	pinkesh.vaghela@...fochips.com,
	xuxiang@...incomputing.com,
	hehuan1@...incomputing.com
Subject: [PATCH v1] mmc: sdhci-of-dwcmshc: fix init for AXI clock and DMA 128MB boundary

From: Huan He <hehuan1@...incomputing.com>

1.Accessing the High-Speed registers requires the AXI clock to be enabled.
2.This DWC MSHC has a 128MB limitation where the data buffer size and
  start address must not exceed the 128MB boundary. Registering the
  missing 'adma_write_desc' callback function.

Signed-off-by: Huan He <hehuan1@...incomputing.com>
---
 drivers/mmc/host/sdhci-of-dwcmshc.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c
index 51949cde0958..147f8046707f 100644
--- a/drivers/mmc/host/sdhci-of-dwcmshc.c
+++ b/drivers/mmc/host/sdhci-of-dwcmshc.c
@@ -1588,6 +1588,7 @@ static int eic7700_init(struct device *dev, struct sdhci_host *host, struct dwcm
 {
 	u32 emmc_caps = MMC_CAP2_NO_SD | MMC_CAP2_NO_SDIO;
 	unsigned int val, hsp_int_status, hsp_pwr_ctrl;
+	static const char * const clk_ids[] = {"axi"};
 	struct of_phandle_args args;
 	struct eic7700_priv *priv;
 	struct regmap *hsp_regmap;
@@ -1605,6 +1606,11 @@ static int eic7700_init(struct device *dev, struct sdhci_host *host, struct dwcm
 		return ret;
 	}
 
+	ret = dwcmshc_get_enable_other_clks(mmc_dev(host->mmc), dwc_priv,
+					    ARRAY_SIZE(clk_ids), clk_ids);
+	if (ret)
+		return ret;
+
 	ret = of_parse_phandle_with_fixed_args(dev->of_node, "eswin,hsp-sp-csr", 2, 0, &args);
 	if (ret) {
 		dev_err(dev, "Fail to parse 'eswin,hsp-sp-csr' phandle (%d)\n", ret);
@@ -1726,6 +1732,7 @@ static const struct sdhci_ops sdhci_dwcmshc_eic7700_ops = {
 	.set_uhs_signaling = sdhci_eic7700_set_uhs_wrapper,
 	.set_power = sdhci_set_power_and_bus_voltage,
 	.irq = dwcmshc_cqe_irq_handler,
+	.adma_write_desc = dwcmshc_adma_write_desc,
 	.platform_execute_tuning = sdhci_eic7700_executing_tuning,
 };
 
-- 
2.25.1