[PATCH v3 1/3] ufs: core: Add get_hba_nortt callback for vendor-specific RTT capability

[<ed.tsai@mediatek.com>]

From: Ed Tsai <ed.tsai@mediatek.com>

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>
---
 drivers/ufs/core/ufshcd.c | 5 ++++-
 include/ufs/ufshcd.h      | 3 +++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index c3f08957d179..382b6041c716 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -2529,7 +2529,10 @@ 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);
diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
index cfbc75d8df83..421c286481e8 100644
--- a/include/ufs/ufshcd.h
+++ b/include/ufs/ufshcd.h
@@ -415,6 +415,8 @@ 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;
@@ -477,6 +479,7 @@ 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  */
-- 
2.45.2