| Message ID | 20191222181704.61511-1-tony@atomide.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [1/3] phy: cpcap-usb: Prevent USB line glitches from waking up modem | expand |
On Sun 2019-12-22 10:17:02, Tony Lindgren wrote: > The micro-USB connector on Motorola Mapphone devices can be muxed between > the SoC and the mdm6600 modem. But even when used for the SoC, configuring > the PHY with ID pin grounded will wake up the modem from idle state. Looks > like the issue is probably caused by line glitches. > > We can prevent the glitches by using a previously unknown mode of the > GPIO mux to prevent the USB lines from being connected to the moden while > configuring the USB PHY, and enable the USB lines after configuring the > PHY. > > Note that this only prevents waking up mdm6600 as regular USB A-host mode, > and does not help when connected to a lapdock. The lapdock specific issue > still needs to be debugged separately. > > Cc: Merlijn Wajer <merlijn@wizzup.org> > Cc: Pavel Machek <pavel@ucw.cz> > Cc: Sebastian Reichel <sre@kernel.org> > Signed-off-by: Tony Lindgren <tony@atomide.com> Nothing obviously wrong in the series. Acked-by: Pavel Machek <pavel@ucw.cz> Patch 2/ does not apply on top of 5.5-rc3 AFAICT. Best regards, Pavel
diff --git a/drivers/phy/motorola/phy-cpcap-usb.c b/drivers/phy/motorola/phy-cpcap-usb.c --- a/drivers/phy/motorola/phy-cpcap-usb.c +++ b/drivers/phy/motorola/phy-cpcap-usb.c @@ -115,7 +115,7 @@ struct cpcap_usb_ints_state { enum cpcap_gpio_mode { CPCAP_DM_DP, CPCAP_MDM_RX_TX, - CPCAP_UNKNOWN, + CPCAP_UNKNOWN_DISABLED, /* Seems to disable USB lines */ CPCAP_OTG_DM_DP, }; @@ -381,7 +381,8 @@ static int cpcap_usb_set_uart_mode(struct cpcap_phy_ddata *ddata) { int error; - error = cpcap_usb_gpio_set_mode(ddata, CPCAP_DM_DP); + /* Disable lines to prevent glitches from waking up mdm6600 */ + error = cpcap_usb_gpio_set_mode(ddata, CPCAP_UNKNOWN_DISABLED); if (error) goto out_err; @@ -408,6 +409,11 @@ static int cpcap_usb_set_uart_mode(struct cpcap_phy_ddata *ddata) if (error) goto out_err; + /* Enable UART mode */ + error = cpcap_usb_gpio_set_mode(ddata, CPCAP_DM_DP); + if (error) + goto out_err; + return 0; out_err: @@ -420,7 +426,8 @@ static int cpcap_usb_set_usb_mode(struct cpcap_phy_ddata *ddata) { int error; - error = cpcap_usb_gpio_set_mode(ddata, CPCAP_OTG_DM_DP); + /* Disable lines to prevent glitches from waking up mdm6600 */ + error = cpcap_usb_gpio_set_mode(ddata, CPCAP_UNKNOWN_DISABLED); if (error) return error; @@ -460,6 +467,11 @@ static int cpcap_usb_set_usb_mode(struct cpcap_phy_ddata *ddata) if (error) goto out_err; + /* Enable USB mode */ + error = cpcap_usb_gpio_set_mode(ddata, CPCAP_OTG_DM_DP); + if (error) + goto out_err; + return 0; out_err:
The micro-USB connector on Motorola Mapphone devices can be muxed between the SoC and the mdm6600 modem. But even when used for the SoC, configuring the PHY with ID pin grounded will wake up the modem from idle state. Looks like the issue is probably caused by line glitches. We can prevent the glitches by using a previously unknown mode of the GPIO mux to prevent the USB lines from being connected to the moden while configuring the USB PHY, and enable the USB lines after configuring the PHY. Note that this only prevents waking up mdm6600 as regular USB A-host mode, and does not help when connected to a lapdock. The lapdock specific issue still needs to be debugged separately. Cc: Merlijn Wajer <merlijn@wizzup.org> Cc: Pavel Machek <pavel@ucw.cz> Cc: Sebastian Reichel <sre@kernel.org> Signed-off-by: Tony Lindgren <tony@atomide.com> --- drivers/phy/motorola/phy-cpcap-usb.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-)