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ufs: Add support for sending UFS attribute requests

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Some UFS attributes must be set before a UFS device is initialized.
Add ufshcd_query_attr and ufshcd_query_attr_retry to send UFS
attribute requests.

Taken from Linux Kernel v6.17 (drivers/ufs/core/ufshcd.c) and ported
to U-Boot.

Signed-off-by: Jared McArthur <j-mcarthur@ti.com>
Reviewed-by: Bryan Brattlof <bb@ti.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Udit Kumar <u-kumar1@ti.com>
Reviewed-by: Neha Malcom Francis <n-francis@ti.com>
Link: https://patch.msgid.link/20251010195556.1772611-2-j-mcarthur@ti.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
This commit is contained in:
Jared McArthur 2025-10-10 14:55:55 -05:00 committed by Neil Armstrong
parent d0dfb8c635
commit ae0872e9c3
1 changed files with 95 additions and 0 deletions
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95
drivers/ufs/ufs.c
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@ -1123,6 +1123,101 @@ static int ufshcd_query_flag_retry(struct ufs_hba *hba,
return ret;
}
/**
* ufshcd_query_attr - API function for sending attribute requests
* @hba: per-adapter instance
* @opcode: attribute opcode
* @idn: attribute idn to access
* @index: index field
* @selector: selector field
* @attr_val: the attribute value after the query request completes
*
* Return: 0 for success, non-zero in case of failure.
*/
int ufshcd_query_attr(struct ufs_hba *hba, enum query_opcode opcode,
enum attr_idn idn, u8 index, u8 selector, u32 *attr_val)
{
struct ufs_query_req *request = NULL;
struct ufs_query_res *response = NULL;
int err;
if (!attr_val) {
dev_err(hba->dev,
"%s: attribute value required for opcode 0x%x\n",
__func__, opcode);
return -EINVAL;
}
ufshcd_init_query(hba, &request, &response, opcode, idn, index, selector);
switch (opcode) {
case UPIU_QUERY_OPCODE_WRITE_ATTR:
request->query_func = UPIU_QUERY_FUNC_STANDARD_WRITE_REQUEST;
request->upiu_req.value = cpu_to_be32(*attr_val);
break;
case UPIU_QUERY_OPCODE_READ_ATTR:
request->query_func = UPIU_QUERY_FUNC_STANDARD_READ_REQUEST;
break;
default:
dev_err(hba->dev,
"%s: Expected query attr opcode but got = 0x%.2x\n",
__func__, opcode);
err = -EINVAL;
goto out;
}
err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_QUERY, QUERY_REQ_TIMEOUT);
if (err) {
dev_err(hba->dev,
"%s: opcode 0x%.2x for idn %d failed, index %d, err = %d\n",
__func__, opcode, idn, index, err);
goto out;
}
*attr_val = be32_to_cpu(response->upiu_res.value);
out:
return err;
}
/**
* ufshcd_query_attr_retry() - API function for sending query
* attribute with retries
* @hba: per-adapter instance
* @opcode: attribute opcode
* @idn: attribute idn to access
* @index: index field
* @selector: selector field
* @attr_val: the attribute value after the query request
* completes
*
* Return: 0 for success, non-zero in case of failure.
*/
int ufshcd_query_attr_retry(struct ufs_hba *hba, enum query_opcode opcode,
enum attr_idn idn, u8 index, u8 selector,
u32 *attr_val)
{
int ret = 0;
u32 retries;
for (retries = QUERY_REQ_RETRIES; retries > 0; retries--) {
ret = ufshcd_query_attr(hba, opcode, idn, index, selector, attr_val);
if (ret)
dev_dbg(hba->dev,
"%s: failed with error %d, retries %d\n",
__func__, ret, retries);
else
break;
}
if (ret)
dev_err(hba->dev,
"%s: query attribute, idn %d, failed with error %d after %d retries\n",
__func__, idn, ret, QUERY_REQ_RETRIES);
return ret;
}
static int __ufshcd_query_descriptor(struct ufs_hba *hba,
enum query_opcode opcode,
enum desc_idn idn, u8 index, u8 selector,