linux-kernel - [PATCH 1/2] mmc: sdhci: Let drivers define their DMA mask

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Date:   Fri, 20 Sep 2019 16:53:16 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>
Cc:     Jon Hunter <jonathanh@...dia.com>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        inux-mmc@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] mmc: sdhci: Let drivers define their DMA mask

From: Adrian Hunter <adrian.hunter@...el.com>

Add host operation ->set_dma_mask() so that drivers can define their own
DMA masks.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Signed-off-by: Thierry Reding <treding@...dia.com>
---
 drivers/mmc/host/sdhci.c | 12 ++++--------
 drivers/mmc/host/sdhci.h |  1 +
 2 files changed, 5 insertions(+), 8 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index a5dc5aae973e..bc04c3180477 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -3756,18 +3756,14 @@ int sdhci_setup_host(struct sdhci_host *host)
 		host->flags &= ~SDHCI_USE_ADMA;
 	}
 
-	/*
-	 * It is assumed that a 64-bit capable device has set a 64-bit DMA mask
-	 * and *must* do 64-bit DMA.  A driver has the opportunity to change
-	 * that during the first call to ->enable_dma().  Similarly
-	 * SDHCI_QUIRK2_BROKEN_64_BIT_DMA must be left to the drivers to
-	 * implement.
-	 */
 	if (sdhci_can_64bit_dma(host))
 		host->flags |= SDHCI_USE_64_BIT_DMA;
 
 	if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
-		ret = sdhci_set_dma_mask(host);
+		if (host->ops->set_dma_mask)
+			ret = host->ops->set_dma_mask(host);
+		else
+			ret = sdhci_set_dma_mask(host);
 
 		if (!ret && host->ops->enable_dma)
 			ret = host->ops->enable_dma(host);
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 902f855efe8f..8285498c0d8a 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -622,6 +622,7 @@ struct sdhci_ops {
 
 	u32		(*irq)(struct sdhci_host *host, u32 intmask);
 
+	int		(*set_dma_mask)(struct sdhci_host *host);
 	int		(*enable_dma)(struct sdhci_host *host);
 	unsigned int	(*get_max_clock)(struct sdhci_host *host);
 	unsigned int	(*get_min_clock)(struct sdhci_host *host);
-- 
2.23.0