[PATCH v4 03/10] scsi: ufs-mediatek: Introduce workaround for power mode change

Stanley Chu
2022-06-15T03:52:37Z

From: CC Chou <cc.chou@mediatek.com>

Some MediaTek SoC chips need special flow for power mode change,
especially for chips supporting HS-G5.

Enable the workaround by setting the host-specific capability.

Reviewed-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: CC Chou <cc.chou@mediatek.com>
Signed-off-by: Eddie Huang <eddie.huang@mediatek.com>
Signed-off-by: Dennis Yu <tun-yu.yu@mediatek.com>
Signed-off-by: Peter Wang <peter.want@medaitek.com>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
---
drivers/ufs/host/ufs-mediatek.c | 60 +++++++++++++++++++++++++++++++--
drivers/ufs/host/ufs-mediatek.h | 1 +
include/ufs/unipro.h | 1 +
3 files changed, 60 insertions(+), 2 deletions(-)

diff --git a/drivers/ufs/host/ufs-mediatek.c b/drivers/ufs/host/ufs-mediatek.c
index beabc3ccd30b..2931fd21e38a 100755
--- a/drivers/ufs/host/ufs-mediatek.c
+++ b/drivers/ufs/host/ufs-mediatek.c
@@ -82,6 +82,13 @@ static bool ufs_mtk_is_broken_vcc(struct ufs_hba *hba)
return !!(host->caps & UFS_MTK_CAP_BROKEN_VCC);
}

+static bool ufs_mtk_is_pmc_via_fastauto(struct ufs_hba *hba)
+{
+ struct ufs_mtk_host *host = ufshcd_get_variant(hba);
+
+ return (host->caps & UFS_MTK_CAP_PMC_VIA_FASTAUTO);
+}
+
static void ufs_mtk_cfg_unipro_cg(struct ufs_hba *hba, bool enable)
{
u32 tmp;
@@ -579,6 +586,9 @@ static void ufs_mtk_init_host_caps(struct ufs_hba *hba)
if (of_property_read_bool(np, "mediatek,ufs-broken-vcc"))
host->caps |= UFS_MTK_CAP_BROKEN_VCC;

+ if (of_property_read_bool(np, "mediatek,ufs-pmc-via-fastauto"))
+ host->caps |= UFS_MTK_CAP_PMC_VIA_FASTAUTO;
+
dev_info(hba->dev, "caps: 0x%x", host->caps);
}

@@ -754,6 +764,26 @@ static int ufs_mtk_init(struct ufs_hba *hba)
return err;
}

+static bool ufs_mtk_pmc_via_fastauto(struct ufs_hba *hba,
+ struct ufs_pa_layer_attr *dev_req_params)
+{
+ if (!ufs_mtk_is_pmc_via_fastauto(hba))
+ return false;
+
+ if (dev_req_params->hs_rate == hba->pwr_info.hs_rate)
+ return false;
+
+ if (dev_req_params->pwr_tx != FAST_MODE &&
+ dev_req_params->gear_tx < UFS_HS_G4)
+ return false;
+
+ if (dev_req_params->pwr_rx != FAST_MODE &&
+ dev_req_params->gear_rx < UFS_HS_G4)
+ return false;
+
+ return true;
+}
+
static int ufs_mtk_pre_pwr_change(struct ufs_hba *hba,
struct ufs_pa_layer_attr *dev_max_params,
struct ufs_pa_layer_attr *dev_req_params)
@@ -763,8 +793,8 @@ static int ufs_mtk_pre_pwr_change(struct ufs_hba *hba,
int ret;

ufshcd_init_pwr_dev_param(&host_cap);
- host_cap.hs_rx_gear = UFS_HS_G4;
- host_cap.hs_tx_gear = UFS_HS_G4;
+ host_cap.hs_rx_gear = UFS_HS_G5;
+ host_cap.hs_tx_gear = UFS_HS_G5;

ret = ufshcd_get_pwr_dev_param(&host_cap,
dev_max_params,
@@ -774,6 +804,32 @@ static int ufs_mtk_pre_pwr_change(struct ufs_hba *hba,
__func__);
}

+ if (ufs_mtk_pmc_via_fastauto(hba, dev_req_params)) {
+ ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TXTERMINATION), true);
+ ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TXGEAR), UFS_HS_G1);
+
+ ufshcd_dme_set(hba, UIC_ARG_MIB(PA_RXTERMINATION), true);
+ ufshcd_dme_set(hba, UIC_ARG_MIB(PA_RXGEAR), UFS_HS_G1);
+
+ ufshcd_dme_set(hba, UIC_ARG_MIB(PA_ACTIVETXDATALANES),
+ dev_req_params->lane_tx);
+ ufshcd_dme_set(hba, UIC_ARG_MIB(PA_ACTIVERXDATALANES),
+ dev_req_params->lane_rx);
+ ufshcd_dme_set(hba, UIC_ARG_MIB(PA_HSSERIES),
+ dev_req_params->hs_rate);
+
+ ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TXHSADAPTTYPE),
+ PA_NO_ADAPT);
+
+ ret = ufshcd_uic_change_pwr_mode(hba,
+ FASTAUTO_MODE << 4 | FASTAUTO_MODE);
+
+ if (ret) {
+ dev_err(hba->dev, "%s: HSG1B FASTAUTO failed ret=%d\n",
+ __func__, ret);
+ }
+ }
+
if (host->hw_ver.major >= 3) {
ret = ufshcd_dme_configure_adapt(hba,
dev_req_params->gear_tx,
diff --git a/drivers/ufs/host/ufs-mediatek.h b/drivers/ufs/host/ufs-mediatek.h
index 414dca86c09f..7e1913769671 100755
--- a/drivers/ufs/host/ufs-mediatek.h
+++ b/drivers/ufs/host/ufs-mediatek.h
@@ -108,6 +108,7 @@ enum ufs_mtk_host_caps {
UFS_MTK_CAP_VA09_PWR_CTRL = 1 << 1,
UFS_MTK_CAP_DISABLE_AH8 = 1 << 2,
UFS_MTK_CAP_BROKEN_VCC = 1 << 3,
+ UFS_MTK_CAP_PMC_VIA_FASTAUTO = 1 << 6,
};

struct ufs_mtk_crypt_cfg {
diff --git a/include/ufs/unipro.h b/include/ufs/unipro.h
index 0521f887e3ac..4b13fbf8ee18 100755
--- a/include/ufs/unipro.h
+++ b/include/ufs/unipro.h
@@ -229,6 +229,7 @@ enum ufs_hs_gear_tag {
UFS_HS_G2, /* HS Gear 2 */
UFS_HS_G3, /* HS Gear 3 */
UFS_HS_G4, /* HS Gear 4 */
+ UFS_HS_G5 /* HS Gear 5 */
};

enum ufs_unipro_ver {
--
2.18.0