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scsi: ufs: ufs-mediatek: Introduce workaround for power mode change 

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.

Link: https://lore.kernel.org/r/20220616053725.5681-4-stanley.chu@mediatek.com
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>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
CC Chou 2022-06-16 13:37:17 +08:00 committed by Martin K. Petersen
parent d81c4c6f71
commit 3f9b6cec12
3 changed files with 60 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

60
drivers/ufs/host/ufs-mediatek.c
View File

@ -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,

1
drivers/ufs/host/ufs-mediatek.h
View File

@ -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 {

1
include/ufs/unipro.h
View File

@ -228,6 +228,7 @@ 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 {