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Message-Id: <1479947528-7136-1-git-send-email-subhashj@codeaurora.org>
Date: Wed, 23 Nov 2016 16:32:08 -0800
From: Subhash Jadavani <subhashj@...eaurora.org>
To: vinholikatti@...il.com, jejb@...ux.vnet.ibm.com,
martin.petersen@...cle.com
Cc: Subhash Jadavani <subhashj@...eaurora.org>,
linux-scsi@...r.kernel.org (open list:UNIVERSAL FLASH STORAGE HOST
CONTROLLER DRIVER), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v1 06/11] scsi: ufs: ensure that host pa_tactivate is higher than device
Some UFS devices require host PA_TACTIVATE to be higher than
device PA_TACTIVATE otherwise it may get stuck during hibern8 sequence.
This change allows this by using quirk.
Reviewed-by: Venkat Gopalakrishnan <venkatg@...eaurora.org>
Signed-off-by: Subhash Jadavani <subhashj@...eaurora.org>
---
drivers/scsi/ufs/ufs_quirks.h | 9 ++++++
drivers/scsi/ufs/ufshcd.c | 73 +++++++++++++++++++++++++++++++++++++++++++
drivers/scsi/ufs/unipro.h | 4 +++
3 files changed, 86 insertions(+)
diff --git a/drivers/scsi/ufs/ufs_quirks.h b/drivers/scsi/ufs/ufs_quirks.h
index 22f881e..f798305 100644
--- a/drivers/scsi/ufs/ufs_quirks.h
+++ b/drivers/scsi/ufs/ufs_quirks.h
@@ -128,6 +128,13 @@ struct ufs_dev_fix {
*/
#define UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM (1 << 6)
+/*
+ * Some UFS devices require host PA_TACTIVATE to be lower than device
+ * PA_TACTIVATE, enabling this quirk ensure this.
+ */
+#define UFS_DEVICE_QUIRK_HOST_PA_TACTIVATE (1 << 7)
+
+
struct ufs_hba;
void ufs_advertise_fixup_device(struct ufs_hba *hba);
@@ -140,6 +147,8 @@ struct ufs_dev_fix {
UFS_DEVICE_QUIRK_RECOVERY_FROM_DL_NAC_ERRORS),
UFS_FIX(UFS_VENDOR_SAMSUNG, UFS_ANY_MODEL,
UFS_DEVICE_NO_FASTAUTO),
+ UFS_FIX(UFS_VENDOR_SAMSUNG, UFS_ANY_MODEL,
+ UFS_DEVICE_QUIRK_HOST_PA_TACTIVATE),
UFS_FIX(UFS_VENDOR_TOSHIBA, UFS_ANY_MODEL,
UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM),
UFS_FIX(UFS_VENDOR_TOSHIBA, "THGLF2G9C8KBADG",
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 393f6d5..28cbca2 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -5089,6 +5089,76 @@ static int ufshcd_tune_pa_hibern8time(struct ufs_hba *hba)
return ret;
}
+/**
+ * ufshcd_quirk_tune_host_pa_tactivate - Ensures that host PA_TACTIVATE is
+ * less than device PA_TACTIVATE time.
+ * @hba: per-adapter instance
+ *
+ * Some UFS devices require host PA_TACTIVATE to be lower than device
+ * PA_TACTIVATE, we need to enable UFS_DEVICE_QUIRK_HOST_PA_TACTIVATE quirk
+ * for such devices.
+ *
+ * Returns zero on success, non-zero error value on failure.
+ */
+static int ufshcd_quirk_tune_host_pa_tactivate(struct ufs_hba *hba)
+{
+ int ret = 0;
+ u32 granularity, peer_granularity;
+ u32 pa_tactivate, peer_pa_tactivate;
+ u32 pa_tactivate_us, peer_pa_tactivate_us;
+ u8 gran_to_us_table[] = {1, 4, 8, 16, 32, 100};
+
+ ret = ufshcd_dme_get(hba, UIC_ARG_MIB(PA_GRANULARITY),
+ &granularity);
+ if (ret)
+ goto out;
+
+ ret = ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_GRANULARITY),
+ &peer_granularity);
+ if (ret)
+ goto out;
+
+ if ((granularity < PA_GRANULARITY_MIN_VAL) ||
+ (granularity > PA_GRANULARITY_MAX_VAL)) {
+ dev_err(hba->dev, "%s: invalid host PA_GRANULARITY %d",
+ __func__, granularity);
+ return -EINVAL;
+ }
+
+ if ((peer_granularity < PA_GRANULARITY_MIN_VAL) ||
+ (peer_granularity > PA_GRANULARITY_MAX_VAL)) {
+ dev_err(hba->dev, "%s: invalid device PA_GRANULARITY %d",
+ __func__, peer_granularity);
+ return -EINVAL;
+ }
+
+ ret = ufshcd_dme_get(hba, UIC_ARG_MIB(PA_TACTIVATE), &pa_tactivate);
+ if (ret)
+ goto out;
+
+ ret = ufshcd_dme_peer_get(hba, UIC_ARG_MIB(PA_TACTIVATE),
+ &peer_pa_tactivate);
+ if (ret)
+ goto out;
+
+ pa_tactivate_us = pa_tactivate * gran_to_us_table[granularity - 1];
+ peer_pa_tactivate_us = peer_pa_tactivate *
+ gran_to_us_table[peer_granularity - 1];
+
+ if (pa_tactivate_us > peer_pa_tactivate_us) {
+ u32 new_peer_pa_tactivate;
+
+ new_peer_pa_tactivate = pa_tactivate_us /
+ gran_to_us_table[peer_granularity - 1];
+ new_peer_pa_tactivate++;
+ ret = ufshcd_dme_peer_set(hba, UIC_ARG_MIB(PA_TACTIVATE),
+ new_peer_pa_tactivate);
+ }
+
+out:
+ return ret;
+}
+
static void ufshcd_tune_unipro_params(struct ufs_hba *hba)
{
if (ufshcd_is_unipro_pa_params_tuning_req(hba)) {
@@ -5099,6 +5169,9 @@ static void ufshcd_tune_unipro_params(struct ufs_hba *hba)
if (hba->dev_quirks & UFS_DEVICE_QUIRK_PA_TACTIVATE)
/* set 1ms timeout for PA_TACTIVATE */
ufshcd_dme_set(hba, UIC_ARG_MIB(PA_TACTIVATE), 10);
+
+ if (hba->dev_quirks & UFS_DEVICE_QUIRK_HOST_PA_TACTIVATE)
+ ufshcd_quirk_tune_host_pa_tactivate(hba);
}
/**
diff --git a/drivers/scsi/ufs/unipro.h b/drivers/scsi/ufs/unipro.h
index eff8b56..23129d7 100644
--- a/drivers/scsi/ufs/unipro.h
+++ b/drivers/scsi/ufs/unipro.h
@@ -123,6 +123,7 @@
#define PA_MAXRXHSGEAR 0x1587
#define PA_RXHSUNTERMCAP 0x15A5
#define PA_RXLSTERMCAP 0x15A6
+#define PA_GRANULARITY 0x15AA
#define PA_PACPREQTIMEOUT 0x1590
#define PA_PACPREQEOBTIMEOUT 0x1591
#define PA_HIBERN8TIME 0x15A7
@@ -158,6 +159,9 @@
#define VS_DEBUGOMC 0xD09E
#define VS_POWERSTATE 0xD083
+#define PA_GRANULARITY_MIN_VAL 1
+#define PA_GRANULARITY_MAX_VAL 6
+
/* PHY Adapter Protocol Constants */
#define PA_MAXDATALANES 4
--
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