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scsi: ufs: core: Add get_hba_nortt callback for vendor-specific RTT capability

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The number of outstanding RTTs read from host controller capability
register is problematic on some platforms. Add a new vendor callback
get_hba_nortt() to allow platform vendors to override the default RTT
capability value with platform-specific handling.

This patch keeps max_num_rtt field for bisectability and will be removed in
a later patch once all platforms are migrated.

Signed-off-by: Ed Tsai <ed.tsai@mediatek.com>
Reviewed-by: Peter Wang <peter.wang@mediatek.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Link: https://patch.msgid.link/20260615055802.105479-2-ed.tsai@mediatek.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Ed Tsai 2026-06-15 13:57:15 +08:00 committed by Martin K. Petersen
parent dc59e4fea9
commit e7896d02cb
2 changed files with 7 additions and 1 deletions
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5
drivers/ufs/core/ufshcd.c
View File

@ -2506,7 +2506,10 @@ static inline int ufshcd_hba_capabilities(struct ufs_hba *hba)
hba->nutmrs =
((hba->capabilities & MASK_TASK_MANAGEMENT_REQUEST_SLOTS) >> 16) + 1;
hba->nortt = FIELD_GET(MASK_NUMBER_OUTSTANDING_RTT, hba->capabilities) + 1;
if (hba->vops && hba->vops->get_hba_nortt)
hba->nortt = hba->vops->get_hba_nortt(hba);
else
hba->nortt = FIELD_GET(MASK_NUMBER_OUTSTANDING_RTT, hba->capabilities) + 1;
/* Read crypto capabilities */
err = ufshcd_hba_init_crypto_capabilities(hba);

3
include/ufs/ufshcd.h
View File

@ -417,6 +417,8 @@ struct ufshcd_tx_eq_params {
* @get_rx_fom: called to get Figure of Merit (FOM) value.
* @tx_eqtr_notify: called before and after TX Equalization Training procedure
* to allow platform vendor specific configs to take place.
* @get_hba_nortt: called to get maximum number of outstanding RTTs supported by
* the controller.
*/
struct ufs_hba_variant_ops {
const char *name;
@ -479,6 +481,7 @@ struct ufs_hba_variant_ops {
int (*tx_eqtr_notify)(struct ufs_hba *hba,
enum ufs_notify_change_status status,
struct ufs_pa_layer_attr *pwr_mode);
int (*get_hba_nortt)(struct ufs_hba *hba);
};
/* clock gating state */