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Fri, 29 May 2020 01:23:15 -0800 Received: from MTKMBS02N2.mediatek.inc (172.21.101.101) by MTKMBS62N2.mediatek.inc (172.29.193.42) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Fri, 29 May 2020 02:23:19 -0700 Received: from mtkcas08.mediatek.inc (172.21.101.126) by mtkmbs02n2.mediatek.inc (172.21.101.101) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Fri, 29 May 2020 17:23:11 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkcas08.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Fri, 29 May 2020 17:23:10 +0800 From: Stanley Chu To: , , , , Subject: [PATCH v2 4/5] scsi: ufs-mediatek: Fix unbalanced clock on/off Date: Fri, 29 May 2020 17:23:09 +0800 Message-ID: <20200529092310.1106-5-stanley.chu@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20200529092310.1106-1-stanley.chu@mediatek.com> References: <20200529092310.1106-1-stanley.chu@mediatek.com> MIME-Version: 1.0 X-TM-SNTS-SMTP: 83DAA400323415FEC60197EA0FAEFFA75DFAD431B49159932AD28C3CD9C819842000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200529_022327_462005_4CDEC515 X-CRM114-Status: GOOD ( 11.92 ) X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.4 on bombadil.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- 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 Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain 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: pengshun.zhao@mediatek.com, Stanley Chu , bvanassche@acm.org, andy.teng@mediatek.com, cc.chou@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, chaotian.jing@mediatek.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 MediaTek UFS clocks are separated to two parts and controlled by different modules: ufs-mediatek and phy-ufs-mediatek. If both Auto-Hibern8 and clk-gating feature are enabled, mphy power control is not balanced thus unbalanced control also happens to the clocks probed by phy-ufs-mediatek module. Fix this issue by - Promise usage of phy_power_on/off balanced - Remove phy_power_on/off control in suspend/resume vops since both can be handled in setup_clock vops only Signed-off-by: Stanley Chu Reviewed-by: Peter Wang --- drivers/scsi/ufs/ufs-mediatek.c | 56 +++++++++++++++++++-------------- 1 file changed, 32 insertions(+), 24 deletions(-) diff --git a/drivers/scsi/ufs/ufs-mediatek.c b/drivers/scsi/ufs/ufs-mediatek.c index 5f41b7b7db8f..de9e643fb8dd 100644 --- a/drivers/scsi/ufs/ufs-mediatek.c +++ b/drivers/scsi/ufs/ufs-mediatek.c @@ -205,6 +205,23 @@ int ufs_mtk_wait_link_state(struct ufs_hba *hba, u32 state, return -ETIMEDOUT; } +static void ufs_mtk_mphy_power_on(struct ufs_hba *hba, bool on) +{ + struct ufs_mtk_host *host = ufshcd_get_variant(hba); + struct phy *mphy = host->mphy; + + if (!mphy) + return; + + if (on && !host->mphy_powered_on) + phy_power_on(mphy); + else if (!on && host->mphy_powered_on) + phy_power_off(mphy); + else + return; + host->mphy_powered_on = on; +} + /** * ufs_mtk_setup_clocks - enables/disable clocks * @hba: host controller instance @@ -228,25 +245,24 @@ static int ufs_mtk_setup_clocks(struct ufs_hba *hba, bool on, return 0; if (!on && status == PRE_CHANGE) { - if (!ufshcd_is_link_active(hba)) { - ufs_mtk_setup_ref_clk(hba, on); - ret = phy_power_off(host->mphy); - } else { - /* - * Gate ref-clk if link state is in Hibern8 - * triggered by Auto-Hibern8. - */ - if (!ufshcd_can_hibern8_during_gating(hba) && - ufshcd_is_auto_hibern8_enabled(hba)) { - ret = ufs_mtk_wait_link_state(hba, - VS_LINK_HIBERN8, - 15); - if (!ret) - ufs_mtk_setup_ref_clk(hba, on); + /* + * Gate ref-clk and poweroff mphy if link state is in OFF + * or Hibern8 by either ufshcd_link_state_transition() or + * Auto-Hibern8. + */ + if (!ufshcd_is_link_active(hba) || + (!ufshcd_can_hibern8_during_gating(hba) && + ufshcd_is_auto_hibern8_enabled(hba))) { + ret = ufs_mtk_wait_link_state(hba, + VS_LINK_HIBERN8, + 15); + if (!ret) { + ufs_mtk_setup_ref_clk(hba, on); + ufs_mtk_mphy_power_on(hba, on); } } } else if (on && status == POST_CHANGE) { - ret = phy_power_on(host->mphy); + ufs_mtk_mphy_power_on(hba, on); ufs_mtk_setup_ref_clk(hba, on); } @@ -538,7 +554,6 @@ static void ufs_mtk_vreg_set_lpm(struct ufs_hba *hba, bool lpm) static int ufs_mtk_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) { int err; - struct ufs_mtk_host *host = ufshcd_get_variant(hba); if (ufshcd_is_link_hibern8(hba)) { err = ufs_mtk_link_set_lpm(hba); @@ -559,20 +574,13 @@ static int ufs_mtk_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) ufs_mtk_vreg_set_lpm(hba, true); } - if (!ufshcd_is_link_active(hba)) - phy_power_off(host->mphy); - return 0; } static int ufs_mtk_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op) { - struct ufs_mtk_host *host = ufshcd_get_variant(hba); int err; - if (!ufshcd_is_link_active(hba)) - phy_power_on(host->mphy); - if (ufshcd_is_link_hibern8(hba)) { ufs_mtk_vreg_set_lpm(hba, false); err = ufs_mtk_link_set_hpm(hba);