linux-kernel - [PATCH v2 06/17] phy: qcom-qmp: Move SERDES/PCS START after PHY reset

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Date:   Wed, 27 Sep 2017 14:29:02 +0530
From:   Manu Gautam <mgautam@...eaurora.org>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     Felipe Balbi <balbi@...nel.org>, linux-arm-msm@...r.kernel.org,
        linux-usb@...r.kernel.org, Manu Gautam <mgautam@...eaurora.org>,
        Vivek Gautam <vivek.gautam@...eaurora.org>,
        Varadarajan Narayanan <varada@...eaurora.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Wei Yongjun <weiyongjun1@...wei.com>,
        Fengguang Wu <fengguang.wu@...el.com>,
        linux-kernel@...r.kernel.org (open list:GENERIC PHY FRAMEWORK)
Subject: [PATCH v2 06/17] phy: qcom-qmp: Move SERDES/PCS START after PHY reset

Driver is currently performing PHY reset after starting
SERDES/PCS. As per hardware datasheet reset must be done
before starting PHY. Hence, update the sequence.

Signed-off-by: Manu Gautam <mgautam@...eaurora.org>
---
 drivers/phy/qualcomm/phy-qcom-qmp.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c
index aa27757..263cf50 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
@@ -882,12 +882,12 @@ static int qcom_qmp_phy_init(struct phy *phy)
 	if (cfg->has_pwrdn_delay)
 		usleep_range(cfg->pwrdn_delay_min, cfg->pwrdn_delay_max);
 
-	/* start SerDes and Phy-Coding-Sublayer */
-	qphy_setbits(pcs, cfg->regs[QPHY_START_CTRL], cfg->start_ctrl);
-
 	/* Pull PHY out of reset state */
 	qphy_clrbits(pcs, cfg->regs[QPHY_SW_RESET], SW_RESET);
 
+	/* start SerDes and Phy-Coding-Sublayer */
+	qphy_setbits(pcs, cfg->regs[QPHY_START_CTRL], cfg->start_ctrl);
+
 	status = pcs + cfg->regs[QPHY_PCS_READY_STATUS];
 	mask = cfg->mask_pcs_ready;
 
-- 
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