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BACKPORT: scsi: ufs: core: Maximum RTT supported by the host driver

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Allow platform vendors to take precedence having their own max rtt support.
This makes sense because the host controller's nortt characteristic may
vary among vendors.

while at it, set this value for Mediatek, as requested by Peter -
https://lore.kernel.org/all/0a57d6bab739d6a10584f2baba115d00dfc9c94c.camel@mediatek.com/

Change-Id: I577997ccb7d132b10e3fe338108093f4a68b1d35
Signed-off-by: Avri Altman <avri.altman@wdc.com>
Link: https://lore.kernel.org/r/20240530142510.734-3-avri.altman@wdc.com
Reviewed-by: Peter Wang <peter.wang@mediatek.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Bug: 362473899
(cherry picked from commit e75ff63300)
[ bvanassche: converted the MTK RTT limit into a test based on the controller name ]
Signed-off-by: Bart Van Assche <bvanassche@google.com>
This commit is contained in:
Avri Altman 2024-05-30 17:25:08 +03:00 committed by Bart Van Assche
parent 4bf609a0ed
commit 7a9edc1b85
1 changed files with 5 additions and 1 deletions
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6
drivers/ufs/core/ufshcd.c
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@ -8160,6 +8160,9 @@ static void ufshcd_set_rtt(struct ufs_hba *hba)
struct ufs_dev_info *dev_info = &hba->dev_info;
u32 rtt = 0;
u32 dev_rtt = 0;
const int max_num_rtt = hba->vops && hba->vops->name &&
strcmp(hba->vops->name, "mediatek.ufshci") == 0 ? 2 : 0;
int host_rtt_cap = max_num_rtt ? max_num_rtt : to_hba_priv(hba)->nortt;
/* RTT override makes sense only for UFS-4.0 and above */
if (dev_info->wspecversion < 0x400)
@ -8175,7 +8178,8 @@ static void ufshcd_set_rtt(struct ufs_hba *hba)
if (dev_rtt != DEFAULT_MAX_NUM_RTT)
return;
rtt = min_t(int, to_hba_priv(hba)->rtt_cap, to_hba_priv(hba)->nortt);
rtt = min_t(int, to_hba_priv(hba)->rtt_cap, host_rtt_cap);
if (rtt == dev_rtt)
return;