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[104.188.17.28]) by smtp.gmail.com with ESMTPSA id n128sm122717pfn.46.2019.08.28.12.18.01 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 28 Aug 2019 12:18:01 -0700 (PDT) From: Bjorn Andersson To: Alim Akhtar , Avri Altman , Pedro Sousa , "James E.J. Bottomley" , "Martin K. Petersen" Cc: Rob Herring , Mark Rutland , Andy Gross , Bean Huo , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-scsi@vger.kernel.org, Linus Walleij Subject: [PATCH v4 1/3] scsi: ufs: Introduce vops for resetting device Date: Wed, 28 Aug 2019 12:17:54 -0700 Message-Id: <20190828191756.24312-2-bjorn.andersson@linaro.org> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20190828191756.24312-1-bjorn.andersson@linaro.org> References: <20190828191756.24312-1-bjorn.andersson@linaro.org> Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Some UFS memory devices needs their reset line toggled in order to get them into a good state for initialization. Provide a new vops to allow the platform driver to implement this operation. Reviewed-by: Alim Akhtar Signed-off-by: Bjorn Andersson Reviewed-by: Bean Huo --- Changes since v3: - None drivers/scsi/ufs/ufshcd.c | 6 ++++++ drivers/scsi/ufs/ufshcd.h | 8 ++++++++ 2 files changed, 14 insertions(+) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 219c435d69a7..0fb4bfdd7943 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -6235,6 +6235,9 @@ static int ufshcd_reset_and_restore(struct ufs_hba *hba) int retries = MAX_HOST_RESET_RETRIES; do { + /* Reset the attached device */ + ufshcd_vops_device_reset(hba); + err = ufshcd_host_reset_and_restore(hba); } while (err && --retries); @@ -8371,6 +8374,9 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq) goto exit_gating; } + /* Reset the attached device */ + ufshcd_vops_device_reset(hba); + /* Host controller enable */ err = ufshcd_hba_enable(hba); if (err) { diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index 9f61550abc7f..c94cfda52829 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -298,6 +298,7 @@ struct ufs_pwr_mode_info { * @resume: called during host controller PM callback * @dbg_register_dump: used to dump controller debug information * @phy_initialization: used to initialize phys + * @device_reset: called to issue a reset pulse on the UFS device */ struct ufs_hba_variant_ops { const char *name; @@ -326,6 +327,7 @@ struct ufs_hba_variant_ops { int (*resume)(struct ufs_hba *, enum ufs_pm_op); void (*dbg_register_dump)(struct ufs_hba *hba); int (*phy_initialization)(struct ufs_hba *); + void (*device_reset)(struct ufs_hba *hba); }; /* clock gating state */ @@ -1070,6 +1072,12 @@ static inline void ufshcd_vops_dbg_register_dump(struct ufs_hba *hba) hba->vops->dbg_register_dump(hba); } +static inline void ufshcd_vops_device_reset(struct ufs_hba *hba) +{ + if (hba->vops && hba->vops->device_reset) + hba->vops->device_reset(hba); +} + extern struct ufs_pm_lvl_states ufs_pm_lvl_states[]; /*