Commit Message
Greg KH
Oct. 19, 2022, 8:30 a.m. UTC
From: Johan Hovold <johan+linaro@kernel.org> [ Upstream commit a5d6b1ac56cbd6b5850a3a54e35f1cb71e8e8cdd ] Switch to using the device-managed of_iomap helper to avoid leaking memory on probe deferral and driver unbind. Note that this helper checks for already reserved regions and may fail if there are multiple devices claiming the same memory. Two bindings currently rely on overlapping mappings for the PCS region so fallback to non-exclusive mappings for those for now. Fixes: e78f3d15e115 ("phy: qcom-qmp: new qmp phy driver for qcom-chipsets") Signed-off-by: Johan Hovold <johan+linaro@kernel.org> Link: https://lore.kernel.org/r/20220916102340.11520-7-johan+linaro@kernel.org Signed-off-by: Vinod Koul <vkoul@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/phy/qualcomm/phy-qcom-qmp-usb.c | 61 +++++++++++++++++++++++--------- 1 file changed, 44 insertions(+), 17 deletions(-)
Comments
On Wed, Oct 19, 2022 at 10:30:15AM +0200, Greg Kroah-Hartman wrote: > From: Johan Hovold <johan+linaro@kernel.org> > > [ Upstream commit a5d6b1ac56cbd6b5850a3a54e35f1cb71e8e8cdd ] > > Switch to using the device-managed of_iomap helper to avoid leaking > memory on probe deferral and driver unbind. > > Note that this helper checks for already reserved regions and may fail > if there are multiple devices claiming the same memory. Again, because of the above, this should not be backported. Please drop. > Two bindings currently rely on overlapping mappings for the PCS region > so fallback to non-exclusive mappings for those for now. > > Fixes: e78f3d15e115 ("phy: qcom-qmp: new qmp phy driver for qcom-chipsets") > Signed-off-by: Johan Hovold <johan+linaro@kernel.org> > Link: https://lore.kernel.org/r/20220916102340.11520-7-johan+linaro@kernel.org > Signed-off-by: Vinod Koul <vkoul@kernel.org> > Signed-off-by: Sasha Levin <sashal@kernel.org> Johan
--- a/drivers/phy/qualcomm/phy-qcom-qmp-usb.c +++ b/drivers/phy/qualcomm/phy-qcom-qmp-usb.c @@ -2489,6 +2489,21 @@ static const struct phy_ops qcom_qmp_phy .owner = THIS_MODULE, }; +static void __iomem *qmp_usb_iomap(struct device *dev, struct device_node *np, + int index, bool exclusive) +{ + struct resource res; + + if (!exclusive) { + if (of_address_to_resource(np, index, &res)) + return IOMEM_ERR_PTR(-EINVAL); + + return devm_ioremap(dev, res.start, resource_size(&res)); + } + + return devm_of_iomap(dev, np, index, NULL); +} + static int qcom_qmp_phy_usb_create(struct device *dev, struct device_node *np, int id, void __iomem *serdes, const struct qmp_phy_cfg *cfg) @@ -2497,8 +2512,18 @@ int qcom_qmp_phy_usb_create(struct devic struct phy *generic_phy; struct qmp_phy *qphy; char prop_name[MAX_PROP_NAME]; + bool exclusive = true; int ret; + /* + * FIXME: These bindings should be fixed to not rely on overlapping + * mappings for PCS. + */ + if (of_device_is_compatible(dev->of_node, "qcom,sdx65-qmp-usb3-uni-phy")) + exclusive = false; + if (of_device_is_compatible(dev->of_node, "qcom,sm8350-qmp-usb3-uni-phy")) + exclusive = false; + qphy = devm_kzalloc(dev, sizeof(*qphy), GFP_KERNEL); if (!qphy) return -ENOMEM; @@ -2511,17 +2536,17 @@ int qcom_qmp_phy_usb_create(struct devic * For dual lane PHYs: tx2 -> 3, rx2 -> 4, pcs_misc (optional) -> 5 * For single lane PHYs: pcs_misc (optional) -> 3. */ - qphy->tx = of_iomap(np, 0); - if (!qphy->tx) - return -ENOMEM; - - qphy->rx = of_iomap(np, 1); - if (!qphy->rx) - return -ENOMEM; - - qphy->pcs = of_iomap(np, 2); - if (!qphy->pcs) - return -ENOMEM; + qphy->tx = devm_of_iomap(dev, np, 0, NULL); + if (IS_ERR(qphy->tx)) + return PTR_ERR(qphy->tx); + + qphy->rx = devm_of_iomap(dev, np, 1, NULL); + if (IS_ERR(qphy->rx)) + return PTR_ERR(qphy->rx); + + qphy->pcs = qmp_usb_iomap(dev, np, 2, exclusive); + if (IS_ERR(qphy->pcs)) + return PTR_ERR(qphy->pcs); if (cfg->pcs_usb_offset) qphy->pcs_usb = qphy->pcs + cfg->pcs_usb_offset; @@ -2533,9 +2558,9 @@ int qcom_qmp_phy_usb_create(struct devic * offset from the first lane. */ if (cfg->is_dual_lane_phy) { - qphy->tx2 = of_iomap(np, 3); - qphy->rx2 = of_iomap(np, 4); - if (!qphy->tx2 || !qphy->rx2) { + qphy->tx2 = devm_of_iomap(dev, np, 3, NULL); + qphy->rx2 = devm_of_iomap(dev, np, 4, NULL); + if (IS_ERR(qphy->tx2) || IS_ERR(qphy->rx2)) { dev_warn(dev, "Underspecified device tree, falling back to legacy register regions\n"); @@ -2545,15 +2570,17 @@ int qcom_qmp_phy_usb_create(struct devic qphy->rx2 = qphy->rx + QMP_PHY_LEGACY_LANE_STRIDE; } else { - qphy->pcs_misc = of_iomap(np, 5); + qphy->pcs_misc = devm_of_iomap(dev, np, 5, NULL); } } else { - qphy->pcs_misc = of_iomap(np, 3); + qphy->pcs_misc = devm_of_iomap(dev, np, 3, NULL); } - if (!qphy->pcs_misc) + if (IS_ERR(qphy->pcs_misc)) { dev_vdbg(dev, "PHY pcs_misc-reg not used\n"); + qphy->pcs_misc = NULL; + } snprintf(prop_name, sizeof(prop_name), "pipe%d", id); qphy->pipe_clk = devm_get_clk_from_child(dev, np, prop_name);