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scsi: ufs-mediatek: Create reset control device_link

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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" tristate "Mediatek specific hooks to UFS controller platform driver"
depends on SCSI_UFSHCD_PLATFORM && ARCH_MEDIATEK depends on SCSI_UFSHCD_PLATFORM && ARCH_MEDIATEK
select PHY_MTK_UFS select PHY_MTK_UFS
select RESET_TI_SYSCON
help help
This selects the Mediatek specific additions to UFSHCD platform driver. This selects the Mediatek specific additions to UFSHCD platform driver.
UFS host on Mediatek needs some vendor specific configuration before 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; int err;
struct device *dev = &pdev->dev; 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 */ /* perform generic probe */
err = ufshcd_pltfrm_init(pdev, &ufs_hba_mtk_vops); err = ufshcd_pltfrm_init(pdev, &ufs_hba_mtk_vops);
out:
if (err) if (err)
dev_info(dev, "probe failed %d\n", err); dev_info(dev, "probe failed %d\n", err);