[PATCH v2 3/7] ufs: host: mediatek: Add UFS_MTK_CAP_DISABLE_MCQ

[peter.wang at mediatek.com]

From: Po-Wen Kao <powen.kao at mediatek.com>

Add new mediatek host cap UFS_MTK_CAP_DISABLE_MCQ to allow disable
MCQ feature by assigning dts boolean property
"mediatek,ufs-disable-mcq""

Acked-by: Chun-Hung Wu <Chun-Hung.Wu at mediatek.com>
Reviewed-by: Avri Altman <avri.altman at wdc.com>
Reviewed-by: Peter Wang <peter.wang at mediatek.com>
Signed-off-by: Peter Wang <peter.wang at mediatek.com>
Signed-off-by: Po-Wen Kao <powen.kao at mediatek.com>
---
 drivers/ufs/host/ufs-mediatek.c | 12 ++++++++++++
 drivers/ufs/host/ufs-mediatek.h |  1 +
 2 files changed, 13 insertions(+)

diff --git a/drivers/ufs/host/ufs-mediatek.c b/drivers/ufs/host/ufs-mediatek.c
index 25bf5a13cddd..2ee7881533ec 100644
--- a/drivers/ufs/host/ufs-mediatek.c
+++ b/drivers/ufs/host/ufs-mediatek.c
@@ -640,6 +640,9 @@ static void ufs_mtk_init_host_caps(struct ufs_hba *hba)
 	if (of_property_read_bool(np, "mediatek,ufs-tx-skew-fix"))
 		host->caps |= UFS_MTK_CAP_TX_SKEW_FIX;
 
+	if (of_property_read_bool(np, "mediatek,ufs-disable-mcq"))
+		host->caps |= UFS_MTK_CAP_DISABLE_MCQ;
+
 	dev_info(hba->dev, "caps: 0x%x", host->caps);
 }
 
@@ -874,6 +877,9 @@ static void ufs_mtk_init_mcq_irq(struct ufs_hba *hba)
 	host->mcq_nr_intr = UFSHCD_MAX_Q_NR;
 	pdev = container_of(hba->dev, struct platform_device, dev);
 
+	if (host->caps & UFS_MTK_CAP_DISABLE_MCQ)
+		goto failed;
+
 	for (i = 0; i < host->mcq_nr_intr; i++) {
 		/* irq index 0 is legacy irq, sq/cq irq start from index 1 */
 		irq = platform_get_irq(pdev, i + 1);
@@ -1585,6 +1591,12 @@ static int ufs_mtk_clk_scale_notify(struct ufs_hba *hba, bool scale_up,
 
 static int ufs_mtk_get_hba_mac(struct ufs_hba *hba)
 {
+	struct ufs_mtk_host *host = ufshcd_get_variant(hba);
+
+	/* MCQ operation not permitted */
+	if (host->caps & UFS_MTK_CAP_DISABLE_MCQ)
+		return -EPERM;
+
 	return MAX_SUPP_MAC;
 }
 
diff --git a/drivers/ufs/host/ufs-mediatek.h b/drivers/ufs/host/ufs-mediatek.h
index c1acbfc5568f..3f698af5f5ac 100644
--- a/drivers/ufs/host/ufs-mediatek.h
+++ b/drivers/ufs/host/ufs-mediatek.h
@@ -144,6 +144,7 @@ enum ufs_mtk_host_caps {
 	UFS_MTK_CAP_ALLOW_VCCQX_LPM            = 1 << 5,
 	UFS_MTK_CAP_PMC_VIA_FASTAUTO           = 1 << 6,
 	UFS_MTK_CAP_TX_SKEW_FIX                = 1 << 7,
+	UFS_MTK_CAP_DISABLE_MCQ                = 1 << 8,
 };
 
 struct ufs_mtk_crypt_cfg {
-- 
2.18.0