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Bottomley" , "Martin K. Petersen" , Philipp Zabel Cc: linux-arm-msm@vger.kernel.org, linux-phy@lists.infradead.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, Nitin Rawat , Can Guo , Naveen Kumar Goud Arepalli Subject: [PATCH V1 2/2] phy: qcom: Refactor phy_power_on and phy_calibrate callbacks Date: Fri, 12 Jan 2024 21:03:48 +0530 Message-ID: <20240112153348.2778-3-quic_nitirawa@quicinc.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240112153348.2778-1-quic_nitirawa@quicinc.com> References: <20240112153348.2778-1-quic_nitirawa@quicinc.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-QCInternal: smtphost X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: W_m_O80bD-vsP4rYHoQoX6eCtor04T36 X-Proofpoint-GUID: W_m_O80bD-vsP4rYHoQoX6eCtor04T36 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.997,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-12-09_01,2023-12-07_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 bulkscore=0 lowpriorityscore=0 mlxlogscore=999 clxscore=1015 malwarescore=0 impostorscore=0 mlxscore=0 adultscore=0 spamscore=0 priorityscore=1501 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2311290000 definitions=main-2401120121 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1787899383223992648 X-GMAIL-MSGID: 1787899383223992648 Commit 052553af6a31 ("ufs/phy: qcom: Refactor to use phy_init call") puts enabling regulators & clks, calibrating UFS PHY, starting serdes and polling PCS ready status into phy_power_on. In Current code regulators enable, clks enable, calibrating UFS PHY, start_serdes and polling PCS_ready_status are part of phy_power_on. UFS PHY registers are retained after power collapse, meaning calibrating UFS PHY, start_serdes and polling PCS_ready_status can be done only when hba is powered_on, and not needed every time when phy_power_on is called during resume. Hence keep the code which enables PHY's regulators & clks in phy_power_on and move the rest steps into phy_calibrate function. Refactor the code to enable PHY regulators & clks in phy_power_on and move rest of the code to phy_calibrate function. Co-developed-by: Can Guo Signed-off-by: Can Guo Co-developed-by: Naveen Kumar Goud Arepalli Signed-off-by: Naveen Kumar Goud Arepalli Signed-off-by: Nitin Rawat --- drivers/phy/qualcomm/phy-qcom-qmp-ufs.c | 183 +++++++++--------------- 1 file changed, 67 insertions(+), 116 deletions(-) -- 2.43.0 diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c b/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c index 3c2e6255e26f..ae0218738b0b 100644 --- a/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c +++ b/drivers/phy/qualcomm/phy-qcom-qmp-ufs.c @@ -32,14 +32,15 @@ /* QPHY_SW_RESET bit */ #define SW_RESET BIT(0) /* QPHY_POWER_DOWN_CONTROL */ -#define SW_PWRDN BIT(0) +#define SW_PWRUP BIT(0) +#define SW_PWRDN 0 /* QPHY_START_CONTROL bits */ #define SERDES_START BIT(0) #define PCS_START BIT(1) /* QPHY_PCS_READY_STATUS bit */ #define PCS_READY BIT(0) -#define PHY_INIT_COMPLETE_TIMEOUT 10000 +#define PHY_INIT_COMPLETE_TIMEOUT 1000000 struct qmp_phy_init_tbl { unsigned int offset; @@ -1464,8 +1465,25 @@ static void qmp_ufs_init_registers(struct qmp_ufs *qmp, const struct qmp_phy_cfg qmp_ufs_pcs_init(qmp, &cfg->tbls_hs_g4); } -static int qmp_ufs_com_init(struct qmp_ufs *qmp) +static int qmp_ufs_power_off(struct phy *phy) +{ + struct qmp_ufs *qmp = phy_get_drvdata(phy); + const struct qmp_phy_cfg *cfg = qmp->cfg; + + /* Put PHY into POWER DOWN state: active low */ + qphy_clrbits(qmp->pcs, cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL], + SW_PWRDN); + + clk_bulk_disable_unprepare(cfg->num_clks, qmp->clks); + + regulator_bulk_disable(cfg->num_vregs, qmp->vregs); + + return 0; +} + +static int qmp_ufs_power_on(struct phy *phy) { + struct qmp_ufs *qmp = phy_get_drvdata(phy); const struct qmp_phy_cfg *cfg = qmp->cfg; void __iomem *pcs = qmp->pcs; int ret; @@ -1480,8 +1498,7 @@ static int qmp_ufs_com_init(struct qmp_ufs *qmp) if (ret) goto err_disable_regulators; - qphy_setbits(pcs, cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL], SW_PWRDN); - + qphy_setbits(pcs, cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL], SW_PWRUP); return 0; err_disable_regulators: @@ -1490,61 +1507,7 @@ static int qmp_ufs_com_init(struct qmp_ufs *qmp) return ret; } -static int qmp_ufs_com_exit(struct qmp_ufs *qmp) -{ - const struct qmp_phy_cfg *cfg = qmp->cfg; - - reset_control_assert(qmp->ufs_reset); - - clk_bulk_disable_unprepare(cfg->num_clks, qmp->clks); - - regulator_bulk_disable(cfg->num_vregs, qmp->vregs); - - return 0; -} - -static int qmp_ufs_init(struct phy *phy) -{ - struct qmp_ufs *qmp = phy_get_drvdata(phy); - const struct qmp_phy_cfg *cfg = qmp->cfg; - int ret; - dev_vdbg(qmp->dev, "Initializing QMP phy\n"); - - if (cfg->no_pcs_sw_reset) { - /* - * Get UFS reset, which is delayed until now to avoid a - * circular dependency where UFS needs its PHY, but the PHY - * needs this UFS reset. - */ - if (!qmp->ufs_reset) { - qmp->ufs_reset = - devm_reset_control_get_exclusive(qmp->dev, - "ufsphy"); - - if (IS_ERR(qmp->ufs_reset)) { - ret = PTR_ERR(qmp->ufs_reset); - dev_err(qmp->dev, - "failed to get UFS reset: %d\n", - ret); - - qmp->ufs_reset = NULL; - return ret; - } - } - - ret = reset_control_assert(qmp->ufs_reset); - if (ret) - return ret; - } - - ret = qmp_ufs_com_init(qmp); - if (ret) - return ret; - - return 0; -} - -static int qmp_ufs_power_on(struct phy *phy) +static int qmp_ufs_phy_calibrate(struct phy *phy) { struct qmp_ufs *qmp = phy_get_drvdata(phy); const struct qmp_phy_cfg *cfg = qmp->cfg; @@ -1553,11 +1516,21 @@ static int qmp_ufs_power_on(struct phy *phy) unsigned int val; int ret; + qphy_setbits(pcs, cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL], SW_PWRUP); + + ret = reset_control_assert(qmp->ufs_reset); + if (ret) { + dev_err(qmp->dev, "Failed to assert UFS PHY reset %d\n", ret); + return ret; + } + qmp_ufs_init_registers(qmp, cfg); ret = reset_control_deassert(qmp->ufs_reset); - if (ret) + if (ret) { + dev_err(qmp->dev, "Failed to deassert UFS PHY reset %d\n", ret); return ret; + } /* Pull PHY out of reset state */ if (!cfg->no_pcs_sw_reset) @@ -1577,59 +1550,6 @@ static int qmp_ufs_power_on(struct phy *phy) return 0; } -static int qmp_ufs_power_off(struct phy *phy) -{ - struct qmp_ufs *qmp = phy_get_drvdata(phy); - const struct qmp_phy_cfg *cfg = qmp->cfg; - - /* PHY reset */ - if (!cfg->no_pcs_sw_reset) - qphy_setbits(qmp->pcs, cfg->regs[QPHY_SW_RESET], SW_RESET); - - /* stop SerDes */ - qphy_clrbits(qmp->pcs, cfg->regs[QPHY_START_CTRL], SERDES_START); - - /* Put PHY into POWER DOWN state: active low */ - qphy_clrbits(qmp->pcs, cfg->regs[QPHY_PCS_POWER_DOWN_CONTROL], - SW_PWRDN); - - return 0; -} - -static int qmp_ufs_exit(struct phy *phy) -{ - struct qmp_ufs *qmp = phy_get_drvdata(phy); - - qmp_ufs_com_exit(qmp); - - return 0; -} - -static int qmp_ufs_enable(struct phy *phy) -{ - int ret; - - ret = qmp_ufs_init(phy); - if (ret) - return ret; - - ret = qmp_ufs_power_on(phy); - if (ret) - qmp_ufs_exit(phy); - - return ret; -} - -static int qmp_ufs_disable(struct phy *phy) -{ - int ret; - - ret = qmp_ufs_power_off(phy); - if (ret) - return ret; - return qmp_ufs_exit(phy); -} - static int qmp_ufs_set_mode(struct phy *phy, enum phy_mode mode, int submode) { struct qmp_ufs *qmp = phy_get_drvdata(phy); @@ -1641,9 +1561,10 @@ static int qmp_ufs_set_mode(struct phy *phy, enum phy_mode mode, int submode) } static const struct phy_ops qcom_qmp_ufs_phy_ops = { - .power_on = qmp_ufs_enable, - .power_off = qmp_ufs_disable, + .power_on = qmp_ufs_power_on, + .power_off = qmp_ufs_power_off, .set_mode = qmp_ufs_set_mode, + .calibrate = qmp_ufs_phy_calibrate, .owner = THIS_MODULE, }; @@ -1809,6 +1730,32 @@ static int qmp_ufs_parse_dt(struct qmp_ufs *qmp) return 0; } +static int qmp_ufs_get_phy_reset(struct qmp_ufs *qmp) +{ + const struct qmp_phy_cfg *cfg = qmp->cfg; + int ret; + + if (!cfg->no_pcs_sw_reset) + return 0; + + /* + * Get UFS reset, which is delayed until now to avoid a + * circular dependency where UFS needs its PHY, but the PHY + * needs this UFS reset. + */ + + qmp->ufs_reset = devm_reset_control_get_exclusive(qmp->dev, + "ufsphy"); + if (IS_ERR(qmp->ufs_reset)) { + ret = PTR_ERR(qmp->ufs_reset); + dev_err(qmp->dev, "failed to get UFS reset: %d\n", ret); + qmp->ufs_reset = NULL; + return ret; + } + + return 0; +} + static int qmp_ufs_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; @@ -1835,6 +1782,10 @@ static int qmp_ufs_probe(struct platform_device *pdev) if (ret) return ret; + ret = qmp_ufs_get_phy_reset(qmp); + if (ret) + return ret; + /* Check for legacy binding with child node. */ np = of_get_next_available_child(dev->of_node, NULL); if (np) {