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scsi: ufs-mediatek: Create reset control device_link 

Mediatek UFS reset function relies on Reset Control provided by
reset-ti-syscon. To make Mediatek Reset Control work properly, select
reset-ti-syscon to ensure it is being built.

In addition, establish device_link to wait until reset-ti-syscon
initialization is complete during UFS probing.

Link: https://lore.kernel.org/r/1622601720-22466-1-git-send-email-peter.wang@mediatek.com
Reviewed-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Peter Wang <peter.wang@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Peter Wang 2021-06-02 10:42:00 +08:00 committed by Martin K. Petersen
parent 9dda74f343
commit de48898d0c
2 changed files with 30 additions and 0 deletions
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1
drivers/scsi/ufs/Kconfig
View File

@ -115,6 +115,7 @@ config SCSI_UFS_MEDIATEK
tristate "Mediatek specific hooks to UFS controller platform driver"
depends on SCSI_UFSHCD_PLATFORM && ARCH_MEDIATEK
select PHY_MTK_UFS
select RESET_TI_SYSCON
help
This selects the Mediatek specific additions to UFSHCD platform driver.
UFS host on Mediatek needs some vendor specific configuration before

29
drivers/scsi/ufs/ufs-mediatek.c
View File

@ -1068,9 +1068,38 @@ static int ufs_mtk_probe(struct platform_device *pdev)
{
int err;
struct device *dev = &pdev->dev;
struct device_node *reset_node;
struct platform_device *reset_pdev;
struct device_link *link;
reset_node = of_find_compatible_node(NULL, NULL,
"ti,syscon-reset");
if (!reset_node) {
dev_notice(dev, "find ti,syscon-reset fail\n");
goto skip_reset;
}
reset_pdev = of_find_device_by_node(reset_node);
if (!reset_pdev) {
dev_notice(dev, "find reset_pdev fail\n");
goto skip_reset;
}
link = device_link_add(dev, &reset_pdev->dev,
DL_FLAG_AUTOPROBE_CONSUMER);
if (!link) {
dev_notice(dev, "add reset device_link fail\n");
goto skip_reset;
}
/* supplier is not probed */
if (link->status == DL_STATE_DORMANT) {
err = -EPROBE_DEFER;
goto out;
}
skip_reset:
/* perform generic probe */
err = ufshcd_pltfrm_init(pdev, &ufs_hba_mtk_vops);
out:
if (err)
dev_info(dev, "probe failed %d\n", err);