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SubjectRe: [PATCH] scsi: ufs: Consider device limitations for dma_mask
On Fri, Jan 11, 2019 at 02:54:02PM -0800, Bjorn Andersson wrote:
> */
> static int ufshcd_set_dma_mask(struct ufs_hba *hba)
> {
> - if (hba->capabilities & MASK_64_ADDRESSING_SUPPORT) {
> - if (!dma_set_mask_and_coherent(hba->dev, DMA_BIT_MASK(64)))
> - return 0;
> - }
> - return dma_set_mask_and_coherent(hba->dev, DMA_BIT_MASK(32));
> + u64 dma_mask = dma_get_mask(hba->dev);
> +
> + if (hba->capabilities & MASK_64_ADDRESSING_SUPPORT)
> + dma_mask &= DMA_BIT_MASK(64);
> + else
> + dma_mask &= DMA_BIT_MASK(32);
> +
> + return dma_set_mask_and_coherent(hba->dev, dma_mask);

NAK. ufshcd clearly is in charge of setting the dma mask, so reading
it back from someone else who might have set it is completely bogus.

You either need to introduce a quirk or a way to communicate the
different limit so that it can be set by the core.

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