Since we want to keep support for both older usb-phys as well as the
newer generic phys, lets first get the generic PHYs and fallback to
older USB-PHYs only when we fail to get the former.
This should fix the issue with ehci-exynos and ohci-exynos, wherein
in the absence of SAMSUNG_USB2PHY config symbol, we end up getting
the NOP_USB_XCEIV phy when the same is enabled. And thus the PHYs
are not configured properly.
Reported-by: Sachin Kamat <sachin.kamat@xxxxxxxxxxx>
Signed-off-by: Vivek Gautam <gautam.vivek@xxxxxxxxxxx>
Cc: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Cc: Jingoo Han <jg1.han@xxxxxxxxxxx>
---
Based on 'usb-next' branch.
Resending it after adding 'Reported-by' tag.
drivers/usb/host/ehci-exynos.c | 40 +++++++++++++++++-----------------
drivers/usb/host/ohci-exynos.c | 47 +++++++++++++++++++---------------------
2 files changed, 42 insertions(+), 45 deletions(-)
diff --git a/drivers/usb/host/ehci-exynos.c b/drivers/usb/host/ehci-exynos.c
index cda0a2f..2eed9a4 100644
--- a/drivers/usb/host/ehci-exynos.c
+++ b/drivers/usb/host/ehci-exynos.c
@@ -62,18 +62,6 @@ static int exynos_ehci_get_phy(struct device *dev,
int phy_number;
int ret = 0;
- exynos_ehci->phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
- if (IS_ERR(exynos_ehci->phy)) {
- ret = PTR_ERR(exynos_ehci->phy);
- if (ret != -ENXIO && ret != -ENODEV) {
- dev_err(dev, "no usb2 phy configured\n");
- return ret;
- }
- dev_dbg(dev, "Failed to get usb2 phy\n");
- } else {
- exynos_ehci->otg = exynos_ehci->phy->otg;
- }
-
for_each_available_child_of_node(dev->of_node, child) {
ret = of_property_read_u32(child, "reg", &phy_number);
if (ret) {
@@ -90,15 +78,27 @@ static int exynos_ehci_get_phy(struct device *dev,
phy = devm_of_phy_get(dev, child, NULL);
of_node_put(child);
- if (IS_ERR(phy)) {
- ret = PTR_ERR(phy);
- if (ret != -ENOSYS && ret != -ENODEV) {
- dev_err(dev, "no usb2 phy configured\n");
- return ret;
- }
- dev_dbg(dev, "Failed to get usb2 phy\n");
- }
+ if (IS_ERR(phy))
+ /* Lets fallback to older USB-PHYs */
+ goto usb_phy_old;
exynos_ehci->phy_g[phy_number] = phy;
+ /* Make the older PHYs unavailable */
+ exynos_ehci->phy = ERR_PTR(-ENXIO);
+ }
+
+ return 0;
+
+usb_phy_old:
+ exynos_ehci->phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
+ if (IS_ERR(exynos_ehci->phy)) {
+ ret = PTR_ERR(exynos_ehci->phy);
+ if (ret != -ENXIO && ret != -ENODEV) {
+ dev_err(dev, "no usb2 phy configured\n");
+ return ret;
+ }
+ dev_dbg(dev, "Failed to get usb2 phy\n");
+ } else {
+ exynos_ehci->otg = exynos_ehci->phy->otg;
}
return ret;
diff --git a/drivers/usb/host/ohci-exynos.c b/drivers/usb/host/ohci-exynos.c
index a72ab8f..7c48e3f 100644
--- a/drivers/usb/host/ohci-exynos.c
+++ b/drivers/usb/host/ohci-exynos.c
@@ -51,27 +51,12 @@ static int exynos_ohci_get_phy(struct device *dev,
int phy_number;
int ret = 0;
- exynos_ohci->phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
- if (IS_ERR(exynos_ohci->phy)) {
- ret = PTR_ERR(exynos_ohci->phy);
- if (ret != -ENXIO && ret != -ENODEV) {
- dev_err(dev, "no usb2 phy configured\n");
- return ret;
- }
- dev_dbg(dev, "Failed to get usb2 phy\n");
- } else {
- exynos_ohci->otg = exynos_ohci->phy->otg;
- }
-
/*
* Getting generic phy:
* We are keeping both types of phys as a part of transiting OHCI
* to generic phy framework, so as to maintain backward compatibilty
- * with old DTB.
- * If there are existing devices using DTB files built from them,
- * to remove the support for old bindings in this driver,
- * we need to make sure that such devices have their DTBs
- * updated to ones built from new DTS.
+ * with old DTB too.
+ * We fallback to older USB-PHYs when we fail to get generic PHYs.
*/
for_each_available_child_of_node(dev->of_node, child) {
ret = of_property_read_u32(child, "reg", &phy_number);
@@ -89,15 +74,27 @@ static int exynos_ohci_get_phy(struct device *dev,
phy = devm_of_phy_get(dev, child, NULL);
of_node_put(child);
- if (IS_ERR(phy)) {
- ret = PTR_ERR(phy);
- if (ret != -ENOSYS && ret != -ENODEV) {
- dev_err(dev, "no usb2 phy configured\n");
- return ret;
- }
- dev_dbg(dev, "Failed to get usb2 phy\n");
- }
+ if (IS_ERR(phy))
+ /* Lets fallback to older USB-PHYs */
+ goto usb_phy_old;
exynos_ohci->phy_g[phy_number] = phy;
+ /* Make the older PHYs unavailable */
+ exynos_ohci->phy = ERR_PTR(-ENXIO);
+ }
+
+ return 0;
+
+usb_phy_old:
+ exynos_ohci->phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
+ if (IS_ERR(exynos_ohci->phy)) {
+ ret = PTR_ERR(exynos_ohci->phy);
+ if (ret != -ENXIO && ret != -ENODEV) {
+ dev_err(dev, "no usb2 phy configured\n");
+ return ret;
+ }
+ dev_dbg(dev, "Failed to get usb2 phy\n");
+ } else {
+ exynos_ohci->otg = exynos_ohci->phy->otg;
}
return ret;
--
1.7.10.4
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