diff options
| author | Peter Wang <peter.wang@mediatek.com> | 2021-06-02 10:42:00 +0800 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2021-06-15 22:36:23 -0400 |
| commit | de48898d0cb6a3750558f35e14af799eafc3e6db (patch) | |
| tree | 2e3a8f850275fba1ee3cd3faf23ed1acb26bc797 /drivers/scsi | |
| parent | 9dda74f3436449e1a4087e05fef583ccfd689bdd (diff) | |
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>
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/ufs/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/scsi/ufs/ufs-mediatek.c | 29 |
2 files changed, 30 insertions, 0 deletions
diff --git a/drivers/scsi/ufs/Kconfig b/drivers/scsi/ufs/Kconfig index 07cf415367b4..2d137953e7b4 100644 --- a/drivers/scsi/ufs/Kconfig +++ b/drivers/scsi/ufs/Kconfig @@ -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 diff --git a/drivers/scsi/ufs/ufs-mediatek.c b/drivers/scsi/ufs/ufs-mediatek.c index bbe0596afc9d..e883cab83bfc 100644 --- a/drivers/scsi/ufs/ufs-mediatek.c +++ b/drivers/scsi/ufs/ufs-mediatek.c @@ -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); |