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| author | Kiwoong Kim <kwmad.kim@samsung.com> | 2023-09-04 10:30:45 +0900 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2023-09-05 06:10:24 -0400 |
| commit | d32533d30e2119b0c0aa17596734f1f842f750df (patch) | |
| tree | e5009c3e8dde3944537d16af4f493e74273392f5 /drivers/ufs | |
| parent | 2d3f59cf868b4a2dd678a96cd49bdd91411bd59f (diff) | |
| download | linux-d32533d30e2119b0c0aa17596734f1f842f750df.tar.gz | |
scsi: ufs: core: Poll HCS.UCRDY before issuing a UIC command
With auto hibern8 enabled, UIC could be busy processing a hibern8 operation
and the HCI would reports UIC not ready for a short while through
HCS.UCRDY. The UFS driver doesn't currently handle this situation. The
UFSHCI spec specifies UCRDY like this: whether the host controller is ready
to process UIC COMMAND
The 'ready' could be seen as many different meanings. If the meaning
includes not processing any request from HCI, processing a hibern8
operation can be 'not ready'. In this situation, the driver needs to wait
until the operations is completed.
Signed-off-by: Kiwoong Kim <kwmad.kim@samsung.com>
Link: https://lore.kernel.org/r/550484ffb66300bdcec63d3e304dfd55cb432f1f.1693790060.git.kwmad.kim@samsung.com
Reviewed-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Chanwoo Lee <cw9316.lee@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 | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c index f5e66d775b10b..c2df07545f966 100644 --- a/drivers/ufs/core/ufshcd.c +++ b/drivers/ufs/core/ufshcd.c @@ -22,6 +22,7 @@ #include <linux/module.h> #include <linux/regulator/consumer.h> #include <linux/sched/clock.h> +#include <linux/iopoll.h> #include <scsi/scsi_cmnd.h> #include <scsi/scsi_dbg.h> #include <scsi/scsi_driver.h> @@ -2299,7 +2300,11 @@ static inline int ufshcd_hba_capabilities(struct ufs_hba *hba) */ static inline bool ufshcd_ready_for_uic_cmd(struct ufs_hba *hba) { - return ufshcd_readl(hba, REG_CONTROLLER_STATUS) & UIC_COMMAND_READY; + u32 val; + int ret = read_poll_timeout(ufshcd_readl, val, val & UIC_COMMAND_READY, + 500, UIC_CMD_TIMEOUT * 1000, false, hba, + REG_CONTROLLER_STATUS); + return ret == 0 ? true : false; } /** |