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Fri, 13 Mar 2020 01:11:24 -0800 Received: from MTKMBS02N1.mediatek.inc (172.21.101.77) by MTKMBS62N1.mediatek.inc (172.29.193.41) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Fri, 13 Mar 2020 02:01:33 -0700 Received: from mtkcas09.mediatek.inc (172.21.101.178) by mtkmbs02n1.mediatek.inc (172.21.101.77) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Fri, 13 Mar 2020 16:59:09 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkcas09.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1395.4 via Frontend Transport; Fri, 13 Mar 2020 17:00:33 +0800 From: Stanley Chu To: , , , , Subject: [PATCH v4 4/8] scsi: ufs: introduce common delay function Date: Fri, 13 Mar 2020 17:00:59 +0800 Message-ID: <20200313090103.15390-5-stanley.chu@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20200313090103.15390-1-stanley.chu@mediatek.com> References: <20200313090103.15390-1-stanley.chu@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200313_021132_778284_DD09C4F6 X-CRM114-Status: GOOD ( 12.20 ) X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.3 on bombadil.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [216.200.240.184 listed in list.dnswl.org] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record 0.0 MIME_BASE64_TEXT RAW: Message text disguised using base64 encoding -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid 0.0 UNPARSEABLE_RELAY Informational: message has unparseable relay lines X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Stanley Chu , bvanassche@acm.org, andy.teng@mediatek.com, chun-hung.wu@mediatek.com, kuohong.wang@mediatek.com, linux-kernel@vger.kernel.org, cang@codeaurora.org, linux-mediatek@lists.infradead.org, peter.wang@mediatek.com, matthias.bgg@gmail.com, beanhuo@micron.com, linux-arm-kernel@lists.infradead.org, asutoshd@codeaurora.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Introduce common delay function to collect all delay requirements to simplify driver and take choices of udelay and usleep_range into consideration. Signed-off-by: Stanley Chu --- drivers/scsi/ufs/ufshcd.c | 27 ++++++++++++++++++--------- drivers/scsi/ufs/ufshcd.h | 1 + 2 files changed, 19 insertions(+), 9 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index b4988b9ee36c..ce65d321a73f 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -597,6 +597,18 @@ static void ufshcd_print_pwr_info(struct ufs_hba *hba) hba->pwr_info.hs_rate); } +void ufshcd_wait_us(unsigned long us, unsigned long tolerance, bool can_sleep) +{ + if (!us) + return; + + if (us < 10 || !can_sleep) + udelay(us); + else + usleep_range(us, us + tolerance); +} +EXPORT_SYMBOL_GPL(ufshcd_wait_us); + /* * ufshcd_wait_for_register - wait for register value to change * @hba - per-adapter interface @@ -620,10 +632,7 @@ int ufshcd_wait_for_register(struct ufs_hba *hba, u32 reg, u32 mask, val = val & mask; while ((ufshcd_readl(hba, reg) & mask) != val) { - if (can_sleep) - usleep_range(interval_us, interval_us + 50); - else - udelay(interval_us); + ufshcd_wait_us(interval_us, 50, can_sleep); if (time_after(jiffies, timeout)) { if ((ufshcd_readl(hba, reg) & mask) != val) err = -ETIMEDOUT; @@ -3565,7 +3574,7 @@ static inline void ufshcd_add_delay_before_dme_cmd(struct ufs_hba *hba) } /* allow sleep for extra 50us if needed */ - usleep_range(min_sleep_time_us, min_sleep_time_us + 50); + ufshcd_wait_us(min_sleep_time_us, 50, true); } /** @@ -4289,7 +4298,7 @@ int ufshcd_hba_enable(struct ufs_hba *hba) * instruction might be read back. * This delay can be changed based on the controller. */ - usleep_range(1000, 1100); + ufshcd_wait_us(1000, 100, true); /* wait for the host controller to complete initialization */ retry = 10; @@ -4301,7 +4310,7 @@ int ufshcd_hba_enable(struct ufs_hba *hba) "Controller enable failed\n"); return -EIO; } - usleep_range(5000, 5100); + ufshcd_wait_us(5000, 100, true); } /* enable UIC related interrupts */ @@ -6224,7 +6233,7 @@ static int ufshcd_abort(struct scsi_cmnd *cmd) reg = ufshcd_readl(hba, REG_UTP_TRANSFER_REQ_DOOR_BELL); if (reg & (1 << tag)) { /* sleep for max. 200us to stabilize */ - usleep_range(100, 200); + ufshcd_wait_us(100, 100, true); continue; } /* command completed already */ @@ -7783,7 +7792,7 @@ static void ufshcd_vreg_set_lpm(struct ufs_hba *hba) */ if (!ufshcd_is_link_active(hba) && hba->dev_quirks & UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM) - usleep_range(2000, 2100); + ufshcd_wait_us(2000, 100, true); /* * If UFS device is either in UFS_Sleep turn off VCC rail to save some diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index fec004cd8054..4683e7bf6640 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -781,6 +781,7 @@ int ufshcd_init(struct ufs_hba * , void __iomem * , unsigned int); int ufshcd_make_hba_operational(struct ufs_hba *hba); void ufshcd_remove(struct ufs_hba *); int ufshcd_uic_hibern8_exit(struct ufs_hba *hba); +void ufshcd_wait_us(unsigned long us, unsigned long tolerance, bool can_sleep); int ufshcd_wait_for_register(struct ufs_hba *hba, u32 reg, u32 mask, u32 val, unsigned long interval_us, unsigned long timeout_ms, bool can_sleep);