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authorYauhen Kharuzhy <jekhor@gmail.com>2019-09-17 00:15:36 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-02-01 12:34:46 +0300
commit48617aa63951879d9f144c041b67b8c0bf78265a (patch)
treeac2967f9b286f42e95c2dca57828ea080632e5f0 /drivers/extcon
parentde850e86d2e1a7702d9561f6fdaf317af82a3bd4 (diff)
downloadlinux-48617aa63951879d9f144c041b67b8c0bf78265a.tar.xz
extcon-intel-cht-wc: Don't reset USB data connection at probe
[ Upstream commit e81b88932985c9134d410f4eaaaa9b81a3b4bd0c ] Intel Cherry Trail Whiskey Cove extcon driver connect USB data lines to PMIC at driver probing for further charger detection. This causes reset of USB data sessions and removing all devices from bus. If system was booted from Live CD or USB dongle, this makes system unusable. Check if USB ID pin is floating and re-route data lines in this case only, don't touch otherwise. Reviewed-by: Hans de Goede <hdegoede@redhat.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Yauhen Kharuzhy <jekhor@gmail.com> [cw00.choi: Clean-up the minor coding style] Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/extcon')
-rw-r--r--drivers/extcon/extcon-intel-cht-wc.c16
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/extcon/extcon-intel-cht-wc.c b/drivers/extcon/extcon-intel-cht-wc.c
index 9d32150e68db..771f6f4cf92e 100644
--- a/drivers/extcon/extcon-intel-cht-wc.c
+++ b/drivers/extcon/extcon-intel-cht-wc.c
@@ -338,6 +338,7 @@ static int cht_wc_extcon_probe(struct platform_device *pdev)
struct intel_soc_pmic *pmic = dev_get_drvdata(pdev->dev.parent);
struct cht_wc_extcon_data *ext;
unsigned long mask = ~(CHT_WC_PWRSRC_VBUS | CHT_WC_PWRSRC_USBID_MASK);
+ int pwrsrc_sts, id;
int irq, ret;
irq = platform_get_irq(pdev, 0);
@@ -387,8 +388,19 @@ static int cht_wc_extcon_probe(struct platform_device *pdev)
goto disable_sw_control;
}
- /* Route D+ and D- to PMIC for initial charger detection */
- cht_wc_extcon_set_phymux(ext, MUX_SEL_PMIC);
+ ret = regmap_read(ext->regmap, CHT_WC_PWRSRC_STS, &pwrsrc_sts);
+ if (ret) {
+ dev_err(ext->dev, "Error reading pwrsrc status: %d\n", ret);
+ goto disable_sw_control;
+ }
+
+ /*
+ * If no USB host or device connected, route D+ and D- to PMIC for
+ * initial charger detection
+ */
+ id = cht_wc_extcon_get_id(ext, pwrsrc_sts);
+ if (id != INTEL_USB_ID_GND)
+ cht_wc_extcon_set_phymux(ext, MUX_SEL_PMIC);
/* Get initial state */
cht_wc_extcon_pwrsrc_event(ext);