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Message-Id: <1500453819-5223-5-git-send-email-varada@codeaurora.org>
Date: Wed, 19 Jul 2017 14:13:35 +0530
From: Varadarajan Narayanan <varada@...eaurora.org>
To: bhelgaas@...gle.com, robh+dt@...nel.org, mark.rutland@....com,
svarbanov@...sol.com, kishon@...com, sboyd@...eaurora.org,
vivek.gautam@...eaurora.org, fengguang.wu@...el.com,
weiyongjun1@...wei.com, linux-pci@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-msm@...r.kernel.org
Cc: Varadarajan Narayanan <varada@...eaurora.org>
Subject: [PATCH v2 4/8] phy: qcom-qmp: Handle unavailable registers
In some implementations of the QMP phy, some registers might not
be present. Provide a way identify such registers and not access
those registers.
Signed-off-by: Varadarajan Narayanan <varada@...eaurora.org>
---
drivers/phy/qualcomm/phy-qcom-qmp.c | 23 ++++++++++++++---------
1 file changed, 14 insertions(+), 9 deletions(-)
diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c
index 97020ec..000ad1c 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
@@ -187,6 +187,8 @@ struct qmp_phy_init_tbl {
.in_layout = 1, \
}
+#define QPHY_REG_INVAL 0xffffffffu
+
/* set of registers with offsets different per-PHY */
enum qphy_reg_layout {
/* Common block control registers */
@@ -676,15 +678,18 @@ static int qcom_qmp_phy_com_init(struct qcom_qmp *qmp)
qphy_setbits(serdes, cfg->regs[QPHY_COM_START_CONTROL],
SERDES_START | PCS_START);
- status = serdes + cfg->regs[QPHY_COM_PCS_READY_STATUS];
- mask = cfg->mask_com_pcs_ready;
-
- ret = readl_poll_timeout(status, val, (val & mask), 10,
- PHY_INIT_COMPLETE_TIMEOUT);
- if (ret) {
- dev_err(qmp->dev,
- "phy common block init timed-out\n");
- goto err_com_init;
+ if (cfg->regs[QPHY_COM_PCS_READY_STATUS] != QPHY_REG_INVAL) {
+ status = serdes + cfg->regs[QPHY_COM_PCS_READY_STATUS];
+ mask = cfg->mask_com_pcs_ready;
+
+ ret = readl_poll_timeout(status, val, (val & mask), 10,
+ PHY_INIT_COMPLETE_TIMEOUT);
+ if (ret) {
+ dev_err(qmp->dev,
+ "%s: phy common block init timed-out\n",
+ __func__);
+ goto err_com_init;
+ }
}
}
--
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