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scsi: ufs: core: Poll HCS.UCRDY before issuing a UIC command

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[ Upstream commit d32533d30e ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Kiwoong Kim
2023-09-04 10:30:45 +09:00
committed by Greg Kroah-Hartman
parent 81a6cdfcfd
commit 5fb322df09
1 changed files with 6 additions and 1 deletions
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7
drivers/ufs/core/ufshcd.c
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@@ -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>
@@ -2254,7 +2255,11 @@ 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;
}
/**