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scsi: ufs-mediatek: customize the delay for enabling host

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MediaTek platform and UFS controller can dynamically customize the delay
for host enabling according to different scenarios.

For example, if UniPro enters lower-power mode, such delay can be
minimized, otherwise longer delay shall be expected.

Link: https://lore.kernel.org/r/20200318104016.28049-8-stanley.chu@mediatek.com
Reviewed-by: Avri Altman <avri.altman@wdc.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:
Stanley Chu 2020-03-18 18:40:16 +08:00 committed by Martin K. Petersen
parent 9fc305ef8e
commit 73e990b424
2 changed files with 35 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
drivers/scsi/ufs/ufs-mediatek.c
View File

@ -30,11 +30,6 @@
#define ufs_mtk_device_reset_ctrl(high, res) \
ufs_mtk_smc(UFS_MTK_SIP_DEVICE_RESET, high, res)
#define ufs_mtk_unipro_powerdown(hba, powerdown) \
ufshcd_dme_set(hba, \
UIC_ARG_MIB_SEL(VS_UNIPROPOWERDOWNCONTROL, 0), \
powerdown)
static void ufs_mtk_cfg_unipro_cg(struct ufs_hba *hba, bool enable)
{
u32 tmp;
@ -71,6 +66,21 @@ static void ufs_mtk_cfg_unipro_cg(struct ufs_hba *hba, bool enable)
}
}
static int ufs_mtk_hce_enable_notify(struct ufs_hba *hba,
enum ufs_notify_change_status status)
{
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
if (status == PRE_CHANGE) {
if (host->unipro_lpm)
hba->hba_enable_delay_us = 0;
else
hba->hba_enable_delay_us = 600;
}
return 0;
}
static int ufs_mtk_bind_mphy(struct ufs_hba *hba)
{
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
@ -324,12 +334,26 @@ static int ufs_mtk_pwr_change_notify(struct ufs_hba *hba,
return ret;
}
static int ufs_mtk_unipro_set_pm(struct ufs_hba *hba, u32 lpm)
{
int ret;
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
ret = ufshcd_dme_set(hba,
UIC_ARG_MIB_SEL(VS_UNIPROPOWERDOWNCONTROL, 0),
lpm);
if (!ret)
host->unipro_lpm = lpm;
return ret;
}
static int ufs_mtk_pre_link(struct ufs_hba *hba)
{
int ret;
u32 tmp;
ufs_mtk_unipro_powerdown(hba, 0);
ufs_mtk_unipro_set_pm(hba, 0);
/*
* Setting PA_Local_TX_LCC_Enable to 0 before link startup
@ -437,7 +461,7 @@ static int ufs_mtk_link_set_hpm(struct ufs_hba *hba)
if (err)
return err;
err = ufs_mtk_unipro_powerdown(hba, 0);
err = ufs_mtk_unipro_set_pm(hba, 0);
if (err)
return err;
@ -458,10 +482,10 @@ static int ufs_mtk_link_set_lpm(struct ufs_hba *hba)
{
int err;
err = ufs_mtk_unipro_powerdown(hba, 1);
err = ufs_mtk_unipro_set_pm(hba, 1);
if (err) {
/* Resume UniPro state for following error recovery */
ufs_mtk_unipro_powerdown(hba, 0);
ufs_mtk_unipro_set_pm(hba, 0);
return err;
}
@ -552,6 +576,7 @@ static struct ufs_hba_variant_ops ufs_hba_mtk_vops = {
.name = "mediatek.ufshci",
.init = ufs_mtk_init,
.setup_clocks = ufs_mtk_setup_clocks,
.hce_enable_notify = ufs_mtk_hce_enable_notify,
.link_startup_notify = ufs_mtk_link_startup_notify,
.pwr_change_notify = ufs_mtk_pwr_change_notify,
.apply_dev_quirks = ufs_mtk_apply_dev_quirks,

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

@ -91,6 +91,7 @@ enum {
struct ufs_mtk_host {
struct ufs_hba *hba;
struct phy *mphy;
bool unipro_lpm;
bool ref_clk_enabled;
u16 ref_clk_ungating_wait_us;
u16 ref_clk_gating_wait_us;