* Tony Lindgren <t...@atomide.com> [131113 18:36]:
> We are wrongly relying on device id for the DMA configuration
> which can lead to wrong DMA channel being selected.
>
> Fix the issue by using the standard resources like we should.
>
> Cc: Chris Ball <c...@laptop.org>
> Cc: linux-mmc@vger.kernel.org
> Signed-off-by: Tony Lindgren <t...@atomide.com>
> ---
>
> If this looks OK, I'd like to merge this as a fix via arm-soc tree
> along with the other patches in this series as my later patches
> depend on patches in this series.
Looks like we need sig initialized in this patch to avoid some
uninitialized warnings.
Regards,
Tony
From: Tony Lindgren <t...@atomide.com>
Date: Thu, 14 Nov 2013 15:25:06 -0800
Subject: [PATCH] mmc: omap: Fix DMA configuration to not rely on device id
We are wrongly relying on device id for the DMA configuration
which can lead to wrong DMA channel being selected.
Fix the issue by using the standard resources like we should.
Cc: Chris Ball <c...@laptop.org>
Cc: linux-mmc@vger.kernel.org
Signed-off-by: Tony Lindgren <t...@atomide.com>
--- a/drivers/mmc/host/omap.c
+++ b/drivers/mmc/host/omap.c
@@ -90,17 +90,6 @@
#define OMAP_MMC_CMDTYPE_AC 2
#define OMAP_MMC_CMDTYPE_ADTC 3
-#define OMAP_DMA_MMC_TX 21
-#define OMAP_DMA_MMC_RX 22
-#define OMAP_DMA_MMC2_TX 54
-#define OMAP_DMA_MMC2_RX 55
-
-#define OMAP24XX_DMA_MMC2_TX 47
-#define OMAP24XX_DMA_MMC2_RX 48
-#define OMAP24XX_DMA_MMC1_TX 61
-#define OMAP24XX_DMA_MMC1_RX 62
-
-
#define DRIVER_NAME "mmci-omap"
/* Specifies how often in millisecs to poll for card status changes
@@ -1331,7 +1320,7 @@ static int mmc_omap_probe(struct platform_device *pdev)
struct mmc_omap_host *host = NULL;
struct resource *res;
dma_cap_mask_t mask;
- unsigned sig;
+ unsigned sig = 0;
int i, ret = 0;
int irq;
@@ -1408,19 +1397,20 @@ static int mmc_omap_probe(struct platform_device *pdev)
host->dma_tx_burst = -1;
host->dma_rx_burst = -1;
- if (mmc_omap2())
- sig = host->id == 0 ? OMAP24XX_DMA_MMC1_TX :
OMAP24XX_DMA_MMC2_TX;
- else
- sig = host->id == 0 ? OMAP_DMA_MMC_TX : OMAP_DMA_MMC2_TX;
- host->dma_tx = dma_request_channel(mask, omap_dma_filter_fn, &sig);
+ res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx");
+ if (res)
+ sig = res->start;
+ host->dma_tx = dma_request_slave_channel_compat(mask,
+ omap_dma_filter_fn, &sig, &pdev->dev, "tx");
if (!host->dma_tx)
dev_warn(host->dev, "unable to obtain TX DMA engine channel
%u\n",
sig);
- if (mmc_omap2())
- sig = host->id == 0 ? OMAP24XX_DMA_MMC1_RX :
OMAP24XX_DMA_MMC2_RX;
- else
- sig = host->id == 0 ? OMAP_DMA_MMC_RX : OMAP_DMA_MMC2_RX;
- host->dma_rx = dma_request_channel(mask, omap_dma_filter_fn, &sig);
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx");
+ if (res)
+ sig = res->start;
+ host->dma_rx = dma_request_slave_channel_compat(mask,
+ omap_dma_filter_fn, &sig, &pdev->dev, "rx");
if (!host->dma_rx)
dev_warn(host->dev, "unable to obtain RX DMA engine channel
%u\n",
sig);
--
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