On an i.MX8MQ our nvme driver doesn't completely work since we are missing a few cache flushes. One is the prp list, which is an extra buffer that we need to flush before handing it to the hardware. Also the block read/write operations needs more cache flushes on this SoC.
Signed-off-by: Patrick Wildt patrick@blueri.se --- drivers/nvme/nvme.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-)
diff --git a/drivers/nvme/nvme.c b/drivers/nvme/nvme.c index 2444e0270f..69d5e3eedc 100644 --- a/drivers/nvme/nvme.c +++ b/drivers/nvme/nvme.c @@ -123,6 +123,9 @@ static int nvme_setup_prps(struct nvme_dev *dev, u64 *prp2, } *prp2 = (ulong)dev->prp_pool;
+ flush_dcache_range((ulong)dev->prp_pool, (ulong)dev->prp_pool + + dev->prp_entry_num * sizeof(u64)); + return 0; }
@@ -717,9 +720,10 @@ static ulong nvme_blk_rw(struct udevice *udev, lbaint_t blknr, u16 lbas = 1 << (dev->max_transfer_shift - ns->lba_shift); u64 total_lbas = blkcnt;
- if (!read) - flush_dcache_range((unsigned long)buffer, - (unsigned long)buffer + total_len); + flush_dcache_range((unsigned long)buffer, + (unsigned long)buffer + total_len); + invalidate_dcache_range((unsigned long)buffer, + (unsigned long)buffer + total_len);
c.rw.opcode = read ? nvme_cmd_read : nvme_cmd_write; c.rw.flags = 0; @@ -755,9 +759,8 @@ static ulong nvme_blk_rw(struct udevice *udev, lbaint_t blknr, buffer += lbas << ns->lba_shift; }
- if (read) - invalidate_dcache_range((unsigned long)buffer, - (unsigned long)buffer + total_len); + invalidate_dcache_range((unsigned long)buffer, + (unsigned long)buffer + total_len);
return (total_len - temp_len) >> desc->log2blksz; }