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| author | Peter Chen <peter.chen@freescale.com> | 2014-11-26 13:44:28 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-11-26 09:28:12 -0800 |
| commit | b82613cf09455d9a50fbb144ef07b68225f2b452 (patch) | |
| tree | 2b6a1d400d3bbf93244bf85d503fd66c303ae4da /drivers/usb | |
| parent | 6d037db6409c33738c7153e87ae1cf682ca2851b (diff) | |
| download | linux-b82613cf09455d9a50fbb144ef07b68225f2b452.tar.gz linux-b82613cf09455d9a50fbb144ef07b68225f2b452.tar.bz2 linux-b82613cf09455d9a50fbb144ef07b68225f2b452.zip | |
usb: chipidea: add hw_wait_phy_stable for getting stable status
The phy needs some delay to output the stable status from low
power mode. And for OTGSC, the status inputs are debounced
using a 1 ms time constant, so, delay 2ms for controller to get
the stable status(like vbus and id) when the phy leaves low power.
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/chipidea/core.c | 24 |
1 files changed, 16 insertions, 8 deletions
diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c index d87caea261d9..fe3880541efd 100644 --- a/drivers/usb/chipidea/core.c +++ b/drivers/usb/chipidea/core.c @@ -190,6 +190,17 @@ u8 hw_port_test_get(struct ci_hdrc *ci) return hw_read(ci, OP_PORTSC, PORTSC_PTC) >> __ffs(PORTSC_PTC); } +static void hw_wait_phy_stable(void) +{ + /* + * The phy needs some delay to output the stable status from low + * power mode. And for OTGSC, the status inputs are debounced + * using a 1 ms time constant, so, delay 2ms for controller to get + * the stable status, like vbus and id when the phy leaves low power. + */ + usleep_range(2000, 2500); +} + /* The PHY enters/leaves low power mode */ static void ci_hdrc_enter_lpm(struct ci_hdrc *ci, bool enable) { @@ -351,7 +362,9 @@ static int ci_usb_phy_init(struct ci_hdrc *ci) case USBPHY_INTERFACE_MODE_UTMIW: case USBPHY_INTERFACE_MODE_HSIC: ret = _ci_usb_phy_init(ci); - if (ret) + if (!ret) + hw_wait_phy_stable(); + else return ret; hw_phymode_configure(ci); break; @@ -364,6 +377,8 @@ static int ci_usb_phy_init(struct ci_hdrc *ci) break; default: ret = _ci_usb_phy_init(ci); + if (!ret) + hw_wait_phy_stable(); } return ret; @@ -667,13 +682,6 @@ static int ci_hdrc_probe(struct platform_device *pdev) if (ret) { dev_err(dev, "unable to init phy: %d\n", ret); return ret; - } else { - /* - * The delay to sync PHY's status, the maximum delay is - * 2ms since the otgsc uses 1ms timer to debounce the - * PHY's input - */ - usleep_range(2000, 2500); } ci->hw_bank.phys = res->start; |