Bart Van Assche 13f87983fb scsi: ufs: core: Enable DMA clustering ... All UFS host controllers support DMA clustering. Hence enable DMA clustering. Notes: - The max_segment_size parameter implements the 256 KiB limit for the PRDT. The dma_boundary parameter represents a boundary that must not be crossed by DMA scatter/gather lists. I'm not aware of any restrictions on DMA scatter/gather lists in the UFSHCI specification other than the 256 KiB limit for the PRDT and the 32-bit address restriction for controllers that only support 32-bits DMA. The latter restriction is already handled by ufshcd_set_dma_mask(). - Without patch "scsi: ufs: exynos: Fix the maximum segment size", this patch breaks support for the Exynos controller. The history of the dma_boundary parameter in the UFS driver is as follows: * The initial UFS driver did not set the dma_boundary parameter. * Commit 4dd4130a72 ("scsi: make sure all drivers set the use_clustering flag") set the .use_clustering flag. * Commit 4af14d113b ("scsi: remove the use_clustering flag") removed the use_clustering flag and set the dma_boundary parameter instead. Cc: Avri Altman <avri.altman@wdc.com> Cc: Alim Akhtar <alim.akhtar@samsung.com> Cc: Kiwoong Kim <kwmad.kim@samsung.com> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Acked-by: Adrian Hunter <adrian.hunter@intel.com> Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>		2023-01-23 21:35:54 -05:00
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core	scsi: ufs: core: Enable DMA clustering	2023-01-23 21:35:54 -05:00
host	scsi: ufs: exynos: Fix the maximum segment size	2023-01-23 21:35:54 -05:00
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