From: Stanley Chu <stanley.chu@mediatek.com>
To: <linux-scsi@vger.kernel.org>, <martin.petersen@oracle.com>,
<avri.altman@wdc.com>, <alim.akhtar@samsung.com>,
<jejb@linux.ibm.com>
Cc: <matthias.bgg@gmail.com>, <bvanassche@acm.org>,
<linux-mediatek@lists.infradead.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, <kuohong.wang@mediatek.com>,
<peter.wang@mediatek.com>, <chun-hung.wu@mediatek.com>,
<andy.teng@mediatek.com>, <chaotian.jing@mediatek.com>,
<cc.chou@mediatek.com>, Stanley Chu <stanley.chu@mediatek.com>
Subject: [PATCH 4/4] scsi: ufs-mediatek: Add host reset mechanism
Date: Tue, 8 Sep 2020 14:45:07 +0800 [thread overview]
Message-ID: <20200908064507.30774-5-stanley.chu@mediatek.com> (raw)
In-Reply-To: <20200908064507.30774-1-stanley.chu@mediatek.com>
Add host reset mechanism to try to recover host-side errors
during recovery flow.
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
---
drivers/scsi/ufs/ufs-mediatek.c | 48 +++++++++++++++++++++++++++++++--
drivers/scsi/ufs/ufs-mediatek.h | 3 +++
2 files changed, 49 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/ufs/ufs-mediatek.c b/drivers/scsi/ufs/ufs-mediatek.c
index feba74a72309..1a9133ac6efb 100644
--- a/drivers/scsi/ufs/ufs-mediatek.c
+++ b/drivers/scsi/ufs/ufs-mediatek.c
@@ -13,6 +13,7 @@
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
+#include <linux/reset.h>
#include <linux/soc/mediatek/mtk_sip_svc.h>
#include "ufshcd.h"
@@ -91,16 +92,57 @@ static void ufs_mtk_crypto_enable(struct ufs_hba *hba)
}
}
+static void ufs_mtk_host_reset(struct ufs_hba *hba)
+{
+ struct ufs_mtk_host *host = ufshcd_get_variant(hba);
+
+ reset_control_assert(host->hci_reset);
+ reset_control_assert(host->crypto_reset);
+ reset_control_assert(host->unipro_reset);
+
+ usleep_range(100, 110);
+
+ reset_control_deassert(host->unipro_reset);
+ reset_control_deassert(host->crypto_reset);
+ reset_control_deassert(host->hci_reset);
+}
+
+static void ufs_mtk_init_reset_control(struct ufs_hba *hba,
+ struct reset_control **rc,
+ char *str)
+{
+ *rc = devm_reset_control_get(hba->dev, str);
+ if (IS_ERR(*rc)) {
+ dev_info(hba->dev, "Failed to get reset control %s: %d\n",
+ str, PTR_ERR(*rc));
+ *rc = NULL;
+ }
+}
+
+static void ufs_mtk_init_reset(struct ufs_hba *hba)
+{
+ struct ufs_mtk_host *host = ufshcd_get_variant(hba);
+
+ ufs_mtk_init_reset_control(hba, &host->hci_reset,
+ "hci_rst");
+ ufs_mtk_init_reset_control(hba, &host->unipro_reset,
+ "unipro_rst");
+ ufs_mtk_init_reset_control(hba, &host->crypto_reset,
+ "crypto_rst");
+}
+
static int ufs_mtk_hce_enable_notify(struct ufs_hba *hba,
enum ufs_notify_change_status status)
{
struct ufs_mtk_host *host = ufshcd_get_variant(hba);
if (status == PRE_CHANGE) {
- if (host->unipro_lpm)
+ if (host->unipro_lpm) {
hba->vps->hba_enable_delay_us = 0;
- else
+ } else {
hba->vps->hba_enable_delay_us = 600;
+ ufs_mtk_host_reset(hba);
+ }
if (hba->caps & UFSHCD_CAP_CRYPTO)
ufs_mtk_crypto_enable(hba);
@@ -335,6 +377,8 @@ static int ufs_mtk_init(struct ufs_hba *hba)
if (err)
goto out_variant_clear;
+ ufs_mtk_init_reset(hba);
+
/* Enable runtime autosuspend */
hba->caps |= UFSHCD_CAP_RPM_AUTOSUSPEND;
diff --git a/drivers/scsi/ufs/ufs-mediatek.h b/drivers/scsi/ufs/ufs-mediatek.h
index 87657376d27a..5c32d5f52759 100644
--- a/drivers/scsi/ufs/ufs-mediatek.h
+++ b/drivers/scsi/ufs/ufs-mediatek.h
@@ -92,6 +92,9 @@ enum {
struct ufs_mtk_host {
struct ufs_hba *hba;
struct phy *mphy;
+ struct reset_control *hci_reset;
+ struct reset_control *unipro_reset;
+ struct reset_control *crypto_reset;
bool mphy_powered_on;
bool unipro_lpm;
bool ref_clk_enabled;
--
2.18.0
next prev parent reply other threads:[~2020-09-08 6:45 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-08 6:45 [PATCH 0/4] scsi: ufs-mediatek: Fixes for kernel v5.10 Stanley Chu
2020-09-08 6:45 ` [PATCH 1/4] scsi: ufs-mediatek: Eliminate error message for unbound mphy Stanley Chu
2020-09-19 7:31 ` Avri Altman
2020-09-08 6:45 ` [PATCH 2/4] scsi: ufs-mediatek: Fix HOST_PA_TACTIVATE quirk Stanley Chu
2020-09-19 7:53 ` Avri Altman
2020-09-08 6:45 ` [PATCH 3/4] scsi: ufs-mediatek: Fix flag of unipro low-power mode Stanley Chu
2020-09-19 8:08 ` Avri Altman
2020-10-27 9:52 ` Stanley Chu
2020-09-08 6:45 ` Stanley Chu [this message]
2020-09-29 11:54 ` [PATCH 4/4] scsi: ufs-mediatek: Add host reset mechanism Avri Altman
2020-09-09 2:50 ` [PATCH 0/4] scsi: ufs-mediatek: Fixes for kernel v5.10 Martin K. Petersen
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