Prepare for enabling DMA clustering and also for supporting
PAGE_SIZE != 4096 by declaring explicitly that the maximum segment
size is 4096 bytes for Exynos UFS host controllers. Add this code
in exynos_ufs_hce_enable_notify() such that it happens after
scsi_host_alloc() and before __scsi_init_queue() is called by the
LUN scanning code.
Cc: Alim Akhtar <alim.akhtar@xxxxxxxxxxx>
Cc: Kiwoong Kim <kwmad.kim@xxxxxxxxxxx>
Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx>
---
drivers/ufs/host/ufs-exynos.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/ufs/host/ufs-exynos.c b/drivers/ufs/host/ufs-exynos.c
index 3cdac89a28b8..7c985fc38db1 100644
--- a/drivers/ufs/host/ufs-exynos.c
+++ b/drivers/ufs/host/ufs-exynos.c
@@ -1300,6 +1300,14 @@ static int exynos_ufs_hce_enable_notify(struct ufs_hba *hba,
switch (status) {
case PRE_CHANGE:
+ /*
+ * The maximum segment size must be set after scsi_host_alloc()
+ * has been called and before LUN scanning starts
+ * (ufshcd_async_scan()). Note: this callback may also be called
+ * from other functions than ufshcd_init().
+ */
+ hba->host->max_segment_size = 4096;
+
if (ufs->drv_data->pre_hce_enable) {
ret = ufs->drv_data->pre_hce_enable(ufs);
if (ret)
