linux-kernel - [PATCH v1] mmc: sdhci-of-dwcmshc: fix DMA 128MB boundary

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Message-Id: <20260114122256.1587-1-hehuan1@eswincomputing.com>
Date: Wed, 14 Jan 2026 20:22:56 +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 DMA 128MB boundary

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

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 | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c
index 51949cde0958..cabb709a8108 100644
--- a/drivers/mmc/host/sdhci-of-dwcmshc.c
+++ b/drivers/mmc/host/sdhci-of-dwcmshc.c
@@ -1726,6 +1726,7 @@ 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