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authorRuss Dill <Russ.Dill@gmail.com>2012-06-14 20:24:21 +0400
committerSamuel Ortiz <sameo@linux.intel.com>2012-07-09 02:16:25 +0400
commitc05995c3d7d0d8edda6ecd2855ac5fad15fa4723 (patch)
tree96aa46b3051ca487caba262c01c7084abba5dc09 /drivers/mfd/omap-usb-host.c
parent487bae3c3a4275952ab08fe70da3dae45b54f67a (diff)
downloadlinux-c05995c3d7d0d8edda6ecd2855ac5fad15fa4723.tar.xz
mfd: USB: Fix the omap-usb EHCI ULPI PHY reset fix issues.
'ARM: OMAP3: USB: Fix the EHCI ULPI PHY reset issue' (1fcb57d0) fixes an issue where the ULPI PHYs were not held in reset while initializing the EHCI controller. However, it also changes behavior in omap-usb-host.c omap_usbhs_init by releasing reset while the configuration in that function was done. This change caused a regression on BB-xM where USB would not function if 'usb start' had been run from u-boot before booting. A change was made to release reset a little bit earlier which fixed the issue on BB-xM and did not cause any regressions on 3430 sdp, the board for which the fix was originally made. This new fix, 'USB: EHCI: OMAP: Finish ehci omap phy reset cycle before adding hcd.', (3aa2ae74) caused a regression on OMAP5. The original fix to hold the EHCI controller in reset during initialization was correct, however it appears that changing omap_usbhs_init to not hold the PHYs in reset during it's configuration was incorrect. This patch first reverts both fixes, and then changes ehci_hcd_omap_probe in ehci-omap.c to hold the PHYs in reset as the original patch had done. It also is sure to incorporate the _cansleep change that has been made in the meantime. I've tested this on Beagleboard xM, I'd really like to get an ack from the 3430 sdp and OMAP5 guys before getting this merged. v3 - Brown paper bag its too early in the morning actually run git commit amend fix v2 - Put cansleep gpiolib call outside of spinlock Acked-by: Mantesh Sarashetti <mantesh@ti.com> Tested-by: Mantesh Sarashetti <mantesh@ti.com> Acked-by: Keshava Munegowda <keshava_mgowda@ti.com> Tested-by: Keshava Munegowda <keshava_mgowda@ti.com> Signed-off-by: Russ Dill <Russ.Dill@gmail.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/mfd/omap-usb-host.c')
-rw-r--r--drivers/mfd/omap-usb-host.c48
1 files changed, 47 insertions, 1 deletions
diff --git a/drivers/mfd/omap-usb-host.c b/drivers/mfd/omap-usb-host.c
index 7e96bb229724..41088ecbb2a9 100644
--- a/drivers/mfd/omap-usb-host.c
+++ b/drivers/mfd/omap-usb-host.c
@@ -25,6 +25,7 @@
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/spinlock.h>
+#include <linux/gpio.h>
#include <plat/cpu.h>
#include <plat/usb.h>
#include <linux/pm_runtime.h>
@@ -500,8 +501,21 @@ static void omap_usbhs_init(struct device *dev)
dev_dbg(dev, "starting TI HSUSB Controller\n");
pm_runtime_get_sync(dev);
- spin_lock_irqsave(&omap->lock, flags);
+ if (pdata->ehci_data->phy_reset) {
+ if (gpio_is_valid(pdata->ehci_data->reset_gpio_port[0]))
+ gpio_request_one(pdata->ehci_data->reset_gpio_port[0],
+ GPIOF_OUT_INIT_LOW, "USB1 PHY reset");
+
+ if (gpio_is_valid(pdata->ehci_data->reset_gpio_port[1]))
+ gpio_request_one(pdata->ehci_data->reset_gpio_port[1],
+ GPIOF_OUT_INIT_LOW, "USB2 PHY reset");
+
+ /* Hold the PHY in RESET for enough time till DIR is high */
+ udelay(10);
+ }
+
+ spin_lock_irqsave(&omap->lock, flags);
omap->usbhs_rev = usbhs_read(omap->uhh_base, OMAP_UHH_REVISION);
dev_dbg(dev, "OMAP UHH_REVISION 0x%x\n", omap->usbhs_rev);
@@ -581,9 +595,39 @@ static void omap_usbhs_init(struct device *dev)
}
spin_unlock_irqrestore(&omap->lock, flags);
+
+ if (pdata->ehci_data->phy_reset) {
+ /* Hold the PHY in RESET for enough time till
+ * PHY is settled and ready
+ */
+ udelay(10);
+
+ if (gpio_is_valid(pdata->ehci_data->reset_gpio_port[0]))
+ gpio_set_value_cansleep
+ (pdata->ehci_data->reset_gpio_port[0], 1);
+
+ if (gpio_is_valid(pdata->ehci_data->reset_gpio_port[1]))
+ gpio_set_value_cansleep
+ (pdata->ehci_data->reset_gpio_port[1], 1);
+ }
+
pm_runtime_put_sync(dev);
}
+static void omap_usbhs_deinit(struct device *dev)
+{
+ struct usbhs_hcd_omap *omap = dev_get_drvdata(dev);
+ struct usbhs_omap_platform_data *pdata = &omap->platdata;
+
+ if (pdata->ehci_data->phy_reset) {
+ if (gpio_is_valid(pdata->ehci_data->reset_gpio_port[0]))
+ gpio_free(pdata->ehci_data->reset_gpio_port[0]);
+
+ if (gpio_is_valid(pdata->ehci_data->reset_gpio_port[1]))
+ gpio_free(pdata->ehci_data->reset_gpio_port[1]);
+ }
+}
+
/**
* usbhs_omap_probe - initialize TI-based HCDs
@@ -767,6 +811,7 @@ static int __devinit usbhs_omap_probe(struct platform_device *pdev)
goto end_probe;
err_alloc:
+ omap_usbhs_deinit(&pdev->dev);
iounmap(omap->tll_base);
err_tll:
@@ -818,6 +863,7 @@ static int __devexit usbhs_omap_remove(struct platform_device *pdev)
{
struct usbhs_hcd_omap *omap = platform_get_drvdata(pdev);
+ omap_usbhs_deinit(&pdev->dev);
iounmap(omap->tll_base);
iounmap(omap->uhh_base);
clk_put(omap->init_60m_fclk);