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Subject[PATCH 4/7] phy: qcom-qmp: Handle unavailable registers
Date
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@codeaurora.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;
+ }
}
}

--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
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