linux-kernel - [PATCH 2/2] mmc: sdhci-of-hlwd: disable bounce buffer usage

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Message-ID: <20251006013700.2272166-3-officialTechflashYT@gmail.com>
Date: Sun,  5 Oct 2025 18:37:00 -0700
From: Michael Garofalo <officialtechflashyt@...il.com>
To: adrian.hunter@...el.com,
	ulf.hansson@...aro.org
Cc: linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Michael Garofalo <officialTechflashYT@...il.com>
Subject: [PATCH 2/2] mmc: sdhci-of-hlwd: disable bounce buffer usage

On the SDHCI controller in the Nintendo Wii's "Hollywood" chipset, using
bounce buffers causes the internal Broadcom 4318 Wi-Fi to fail on most
data transfers.  Disabling bounce buffer usage allows reliable
transmission again.

Signed-off-by: Michael Garofalo <officialTechflashYT@...il.com>
---
 drivers/mmc/host/sdhci-of-hlwd.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mmc/host/sdhci-of-hlwd.c b/drivers/mmc/host/sdhci-of-hlwd.c
index 5bb845d13599..59736ae85c14 100644
--- a/drivers/mmc/host/sdhci-of-hlwd.c
+++ b/drivers/mmc/host/sdhci-of-hlwd.c
@@ -63,6 +63,7 @@ static const struct sdhci_ops sdhci_hlwd_ops = {
 static const struct sdhci_pltfm_data sdhci_hlwd_pdata = {
 	.quirks = SDHCI_QUIRK_32BIT_DMA_ADDR |
 		  SDHCI_QUIRK_32BIT_DMA_SIZE,
+	.quirks2 = SDHCI_QUIRK2_NO_BOUNCE_BUFFER,
 	.ops = &sdhci_hlwd_ops,
 };
 
-- 
2.51.0