Commit de48898d authored by Peter Wang's avatar Peter Wang Committed by Martin K. Petersen
Browse files

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: default avatarStanley Chu <stanley.chu@mediatek.com>
Signed-off-by: default avatarPeter Wang <peter.wang@mediatek.com>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent 9dda74f3

drivers/scsi/ufs/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -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

drivers/scsi/ufs/ufs-mediatek.c

+29 −0
Original line number Diff line number Diff line
@@ -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);