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| author | Bjorn Andersson <quic_bjorande@quicinc.com> | 2023-05-14 20:27:38 -0700 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2023-05-19 23:17:19 +0530 |
| commit | 77cbca3a12d3b9501973bdecd28f28b5c2184bf2 (patch) | |
| tree | 85cab4aa5947be54b16cf7b69d1a12bbb370ec60 /drivers/phy | |
| parent | 02545aa31008e1f4fb6875cdd13c415ddf95a24c (diff) | |
| download | linux-77cbca3a12d3b9501973bdecd28f28b5c2184bf2.tar.gz linux-77cbca3a12d3b9501973bdecd28f28b5c2184bf2.tar.bz2 linux-77cbca3a12d3b9501973bdecd28f28b5c2184bf2.zip | |
phy: qcom-qmp-combo: Extend phy_mutex to all phy_ops
The phy core ensures mutual exclusion across the ops for a given phy,
but the upcoming introduction of USB Type-C orientation switching might
race with the DisplayPort phy operations. So extend the mutual exclusion
to cover the remaining ops as well, to avoid concurrent reconfiguration
of the hardware.
Reported-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Johan Hovold <johan+linaro@kernel.org>
Signed-off-by: Bjorn Andersson <quic_bjorande@quicinc.com>
Link: https://lore.kernel.org/r/20230515032743.400170-4-quic_bjorande@quicinc.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/phy')
| -rw-r--r-- | drivers/phy/qualcomm/phy-qcom-qmp-combo.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c index 8918ba2b18a4..6baacdf3a4cb 100644 --- a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c +++ b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c @@ -2437,12 +2437,16 @@ static int qmp_combo_dp_configure(struct phy *phy, union phy_configure_opts *opt struct qmp_combo *qmp = phy_get_drvdata(phy); const struct qmp_phy_cfg *cfg = qmp->cfg; + mutex_lock(&qmp->phy_mutex); + memcpy(&qmp->dp_opts, dp_opts, sizeof(*dp_opts)); if (qmp->dp_opts.set_voltages) { cfg->configure_dp_tx(qmp); qmp->dp_opts.set_voltages = 0; } + mutex_unlock(&qmp->phy_mutex); + return 0; } @@ -2450,11 +2454,16 @@ static int qmp_combo_dp_calibrate(struct phy *phy) { struct qmp_combo *qmp = phy_get_drvdata(phy); const struct qmp_phy_cfg *cfg = qmp->cfg; + int ret = 0; + + mutex_lock(&qmp->phy_mutex); if (cfg->calibrate_dp_phy) - return cfg->calibrate_dp_phy(qmp); + ret = cfg->calibrate_dp_phy(qmp); - return 0; + mutex_unlock(&qmp->phy_mutex); + + return ret; } static int qmp_combo_com_init(struct qmp_combo *qmp) @@ -2578,6 +2587,8 @@ static int qmp_combo_dp_power_on(struct phy *phy) void __iomem *tx = qmp->dp_tx; void __iomem *tx2 = qmp->dp_tx2; + mutex_lock(&qmp->phy_mutex); + qmp_combo_dp_serdes_init(qmp); qmp_combo_configure_lane(tx, cfg->dp_tx_tbl, cfg->dp_tx_tbl_num, 1); @@ -2589,6 +2600,8 @@ static int qmp_combo_dp_power_on(struct phy *phy) /* Configure link rate, swing, etc. */ cfg->configure_dp_phy(qmp); + mutex_unlock(&qmp->phy_mutex); + return 0; } @@ -2596,9 +2609,13 @@ static int qmp_combo_dp_power_off(struct phy *phy) { struct qmp_combo *qmp = phy_get_drvdata(phy); + mutex_lock(&qmp->phy_mutex); + /* Assert DP PHY power down */ writel(DP_PHY_PD_CTL_PSR_PWRDN, qmp->dp_dp_phy + QSERDES_DP_PHY_PD_CTL); + mutex_unlock(&qmp->phy_mutex); + return 0; } |