diff options
| author | Bart Van Assche <bvanassche@acm.org> | 2023-01-12 15:42:15 -0800 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2023-01-23 21:35:54 -0500 |
| commit | 13f87983fb91454e4a534bb41b5b2b43afe97798 (patch) | |
| tree | 4c35de60258f98e5bb2a6318125236787d36e611 /drivers/ufs | |
| parent | 9a80bc5debf74b09f3a8bbc02cfba8d04e2048d0 (diff) | |
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 4dd4130a722f ("scsi: make sure all drivers set the use_clustering
flag") set the .use_clustering flag.
* Commit 4af14d113bcf ("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>
Diffstat (limited to 'drivers/ufs')
| -rw-r--r-- | drivers/ufs/core/ufshcd.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c index e626810a9abb..89a78a0f794c 100644 --- a/drivers/ufs/core/ufshcd.c +++ b/drivers/ufs/core/ufshcd.c @@ -8724,7 +8724,6 @@ static struct scsi_host_template ufshcd_driver_template = { .max_host_blocked = 1, .track_queue_depth = 1, .sdev_groups = ufshcd_driver_groups, - .dma_boundary = PAGE_SIZE - 1, .rpm_autosuspend_delay = RPM_AUTOSUSPEND_DELAY_MS, }; |