Commit 9fc305ef authored Mar 18, 2020 by Stanley Chu Committed by Martin K. Petersen Mar 26, 2020

scsi: ufs: make HCE polling more compact to improve initialization latency

Reduce the waiting period between each HCE (Host Controller Enable) polling
from 5 ms to 1 ms. Also increase the maximum polling times to make "total
polling time" roughly the same.

This change could make HCE initialization faster to improve latency of
ufshcd initialization, error recovery, and resume behaviors.

Link: https://lore.kernel.org/r/20200318104016.28049-7-stanley.chu@mediatek.com


Reviewed-by: Avri Altman <avri.altman@wdc.com>
Reviewed-by: Can Guo <cang@codeaurora.org>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

parent b9dc8aca

drivers/scsi/ufs/ufshcd.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -4238,7 +4238,7 @@ int ufshcd_hba_enable(struct ufs_hba *hba)
		ufshcd_delay_us(hba->hba_enable_delay_us, 100);

		/* wait for the host controller to complete initialization */
		retry = 10;
		retry = 50;
		while (ufshcd_is_hba_active(hba)) {
		if (retry) {
		retry--;
		@@ -4247,7 +4247,7 @@ int ufshcd_hba_enable(struct ufs_hba *hba)
		"Controller enable failed\n");
		return -EIO;
		}
		usleep_range(5000, 5100);
		usleep_range(1000, 1100);
		}

		/* enable UIC related interrupts */

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