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scsi: ufs: ufs-mediatek: Support host power control

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Add interfaces for controlling the host power to optimize the power
consumption in MediaTek UFS platforms.

Link: https://lore.kernel.org/r/20220623035052.18802-7-stanley.chu@mediatek.com
Reviewed-by: Stanley Chu <stanley.chu@mediatek.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Po-Wen Kao <powen.kao@mediatek.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:
Po-Wen Kao 2022-06-23 11:50:50 +08:00 committed by Martin K. Petersen
parent 4918694ccd
commit 2cf5cb2bb1
2 changed files with 17 additions and 0 deletions
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5
drivers/ufs/host/ufs-mediatek.c
View file

@ -1190,6 +1190,8 @@ static int ufs_mtk_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op,
if (ufshcd_is_link_off(hba))
ufs_mtk_device_reset_ctrl(0, res);
ufs_mtk_host_pwr_ctrl(HOST_PWR_HCI, false, res);
return 0;
fail:
/*
@ -1204,10 +1206,13 @@ static int ufs_mtk_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op,
static int ufs_mtk_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
{
int err;
struct arm_smccc_res res;
if (hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL)
ufs_mtk_dev_vreg_set_lpm(hba, false);
ufs_mtk_host_pwr_ctrl(HOST_PWR_HCI, true, res);
err = ufs_mtk_mphy_power_on(hba, true);
if (err)
goto fail;

12
drivers/ufs/host/ufs-mediatek.h
View file

@ -84,6 +84,7 @@ enum {
#define UFS_MTK_SIP_DEVICE_RESET BIT(1)
#define UFS_MTK_SIP_CRYPTO_CTRL BIT(2)
#define UFS_MTK_SIP_REF_CLK_NOTIFICATION BIT(3)
#define UFS_MTK_SIP_HOST_PWR_CTRL BIT(5)
#define UFS_MTK_SIP_GET_VCC_NUM BIT(6)
#define UFS_MTK_SIP_DEVICE_PWR_CTRL BIT(7)
@ -156,6 +157,14 @@ enum ufs_mtk_vcc_num {
UFS_VCC_MAX
};
/*
* Host Power Control options
*/
enum {
HOST_PWR_HCI = 0,
HOST_PWR_MPHY
};
/*
* SMC call wrapper function
*/
@ -195,6 +204,9 @@ static void _ufs_mtk_smc(struct ufs_mtk_smc_arg s)
#define ufs_mtk_device_reset_ctrl(high, res) \
ufs_mtk_smc(UFS_MTK_SIP_DEVICE_RESET, &(res), high)
#define ufs_mtk_host_pwr_ctrl(opt, on, res) \
ufs_mtk_smc(UFS_MTK_SIP_HOST_PWR_CTRL, &(res), opt, on)
#define ufs_mtk_get_vcc_num(res) \
ufs_mtk_smc(UFS_MTK_SIP_GET_VCC_NUM, &(res))