On 8/19/2013 8:02 PM, James Bottomley wrote:
On Mon, 2013-08-19 at 22:56 +0900, Akinobu Mita wrote:
The device-tree probed device for ARM doesn't have dev->dma_mask.
So dma_set_mask() for the device doesn't succeed. The popular trick
for this is - dev->dma_mask = &dev->coherent_dma_mask;
Currently there is no dma_set_mask() call in ufs-pltfrm, but the
forthcoming fix needs proper DMA mask setting in ufs core driver. So
initializing dev->dma_mask as described above is required.
Signed-off-by: Akinobu Mita <m...@fixstars.com>
Cc: Sujit Reddy Thumma <sthu...@codeaurora.org>
Cc: Vinayak Holikatti <vinholika...@gmail.com>
Cc: Santosh Y <santos...@gmail.com>
Cc: "James E.J. Bottomley" <jbottom...@parallels.com>
Cc: linux-scsi@vger.kernel.org
---
drivers/scsi/ufs/ufshcd-pltfrm.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.c b/drivers/scsi/ufs/ufshcd-pltfrm.c
index 94ba40c..c780840 100644
--- a/drivers/scsi/ufs/ufshcd-pltfrm.c
+++ b/drivers/scsi/ufs/ufshcd-pltfrm.c
@@ -122,6 +122,9 @@ static int ufshcd_pltfrm_probe(struct platform_device *pdev)
goto out;
}
+ if (!dev->dma_mask)
+ dev->dma_mask = &dev->coherent_dma_mask;
+
If the DMA mask is NULL, it means there's buggy platform code somewhere;
I'm not sure we should be hacking a fix in a SCSI driver.
Yes, ideally DT core should do this, there are patches lying around but
are not converged. Adding devicet...@vger.kernel.org to see if someone
has better suggestions.
Recent additions to kernel with similar hacks -
https://patchwork.kernel.org/patch/2537021/
--
Regards,
Sujit
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