dany/u-boot-megous
1
0
Fork 0
mirror of https://xff.cz/git/u-boot/ synced 2025-09-25 12:31:17 +02:00
Code Issues Packages Projects Releases Wiki Activity

nvme: Respect timeout when en/disabling the controller

Browse Source 
So far the driver unconditionally delays 10ms when en/disabling the
controller and still return 0 if 10ms times out. In fact, spec defines
a timeout value in the CAP register that is the worst case time that
host software shall wait for the controller to become ready.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Bin Meng
2017-08-22 08:15:11 -07:00
committed by Tom Rini
parent b65c692143
commit 04d2a38401
1 changed files with 11 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/nvme/nvme.c
View File

@@ -47,11 +47,19 @@ struct nvme_queue {
static int nvme_wait_ready(struct nvme_dev *dev, bool enabled) static int nvme_wait_ready(struct nvme_dev *dev, bool enabled)
{ {
u32 bit = enabled ? NVME_CSTS_RDY : 0; u32 bit = enabled ? NVME_CSTS_RDY : 0;
int timeout;
ulong start;
while ((readl(&dev->bar->csts) & NVME_CSTS_RDY) != bit) /* Timeout field in the CAP register is in 500 millisecond units */
udelay(10000); timeout = NVME_CAP_TIMEOUT(dev->cap) * 500;
return 0; start = get_timer(0);
while (get_timer(start) < timeout) {
if ((readl(&dev->bar->csts) & NVME_CSTS_RDY) == bit)
return 0;
}
return -ETIME;
} }
static int nvme_setup_prps(struct nvme_dev *dev, u64 *prp2, static int nvme_setup_prps(struct nvme_dev *dev, u64 *prp2,