diff options
Diffstat (limited to 'drivers/scsi/ufs/ufshcd.c')
| -rw-r--r-- | drivers/scsi/ufs/ufshcd.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 19270748ecd4..f4aa10fdbb0c 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -91,6 +91,9 @@ /* default delay of autosuspend: 2000 ms */ #define RPM_AUTOSUSPEND_DELAY_MS 2000 +/* Default value of wait time before gating device ref clock */ +#define UFSHCD_REF_CLK_GATING_WAIT_US 0xFF /* microsecs */ + #define ufshcd_toggle_vreg(_dev, _vreg, _on) \ ({ \ int _ret; \ @@ -3281,6 +3284,31 @@ static inline int ufshcd_read_unit_desc_param(struct ufs_hba *hba, param_offset, param_read_buf, param_size); } +static int ufshcd_get_ref_clk_gating_wait(struct ufs_hba *hba) +{ + int err = 0; + u32 gating_wait = UFSHCD_REF_CLK_GATING_WAIT_US; + + if (hba->dev_info.wspecversion >= 0x300) { + err = ufshcd_query_attr_retry(hba, UPIU_QUERY_OPCODE_READ_ATTR, + QUERY_ATTR_IDN_REF_CLK_GATING_WAIT_TIME, 0, 0, + &gating_wait); + if (err) + dev_err(hba->dev, "Failed reading bRefClkGatingWait. err = %d, use default %uus\n", + err, gating_wait); + + if (gating_wait == 0) { + gating_wait = UFSHCD_REF_CLK_GATING_WAIT_US; + dev_err(hba->dev, "Undefined ref clk gating wait time, use default %uus\n", + gating_wait); + } + + hba->dev_info.clk_gating_wait_us = gating_wait; + } + + return err; +} + /** * ufshcd_memory_alloc - allocate memory for host memory space data structures * @hba: per adapter instance @@ -6627,6 +6655,10 @@ static int ufs_get_device_desc(struct ufs_hba *hba) dev_info->wmanufacturerid = desc_buf[DEVICE_DESC_PARAM_MANF_ID] << 8 | desc_buf[DEVICE_DESC_PARAM_MANF_ID + 1]; + /* getting Specification Version in big endian format */ + dev_info->wspecversion = desc_buf[DEVICE_DESC_PARAM_SPEC_VER] << 8 | + desc_buf[DEVICE_DESC_PARAM_SPEC_VER + 1]; + model_index = desc_buf[DEVICE_DESC_PARAM_PRDCT_NAME]; err = ufshcd_read_string_desc(hba, model_index, &dev_info->model, SD_ASCII_STD); @@ -7004,6 +7036,8 @@ static int ufshcd_device_params_init(struct ufs_hba *hba) goto out; } + ufshcd_get_ref_clk_gating_wait(hba); + ufs_fixup_device_setup(hba); if (!ufshcd_query_flag_retry(hba, UPIU_QUERY_OPCODE_READ_FLAG, |