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Commit 91df0bf5 authored by Hanumant Singh's avatar Hanumant Singh Committed by Gerrit - the friendly Code Review server
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msm: mdm: Use channel ready gpio to indicate link status 



Channel ready is used by external modem to perform link
enumeration.

Change-Id: I32259796b3fc58296b9d0cea3766c7bee6d4800f
Signed-off-by: default avatarHanumant Singh <hanumant@codeaurora.org>
parent f5c5e9d8

Documentation/devicetree/bindings/arm/msm/mdm-modem.txt

+2 −0
Original line number Diff line number Diff line
@@ -36,6 +36,8 @@ Optional named gpio properties: 
		booted into the PBL bootloader.

- qcom,ap2mdm-wakeup-gpio: gpio used by the apps processor to wake the external modem

		out of a low power state.

- qcom,ap2mdm-chnl-rdy-gpio: gpio used by the apps processor to inform the external modem

		that data link is ready.

- qcom,mdm2ap-wakeup-gpio: gpio from the external modem to the apps processor to wake it

		out of a low power state.

- qcom,ap2mdm-vddmin-gpio: gpio to indicate to the external modem when the apps processor

arch/arm/mach-msm/mdm2.c

+4 −4
Original line number Diff line number Diff line
@@ -225,8 +225,8 @@ static void mdm_power_on_common(struct mdm_modem_drv *mdm_drv) 
	 * de-assert it now so that it can be asserted later.

	 * May not be used.

	 */

	if (GPIO_IS_VALID(MDM_GPIO(AP2MDM_WAKEUP)))

		gpio_direction_output(MDM_GPIO(AP2MDM_WAKEUP), 0);

	if (GPIO_IS_VALID(MDM_GPIO(AP2MDM_CHNLRDY)))

		gpio_direction_output(MDM_GPIO(AP2MDM_CHNLRDY), 0);



	/*

	 * If we did an "early power on" then ignore the very next
@@ -260,8 +260,8 @@ static void mdm_status_changed(struct mdm_modem_drv *mdm_drv, int value) 
		mdm_peripheral_disconnect(mdm_drv);

		msleep(100);

		mdm_peripheral_connect(mdm_drv);

		if (GPIO_IS_VALID(MDM_GPIO(AP2MDM_WAKEUP)))

			gpio_direction_output(MDM_GPIO(AP2MDM_WAKEUP), 1);

		if (GPIO_IS_VALID(MDM_GPIO(AP2MDM_CHNLRDY)))

			gpio_direction_output(MDM_GPIO(AP2MDM_CHNLRDY), 1);

	}

}

arch/arm/mach-msm/mdm_common.c

+12 −4
Original line number Diff line number Diff line
@@ -140,6 +140,7 @@ static struct gpio_map { 
	{"qcom,ap2mdm-status-gpio",     AP2MDM_STATUS},

	{"qcom,mdm2ap-pblrdy-gpio",     MDM2AP_PBLRDY},

	{"qcom,ap2mdm-wakeup-gpio",     AP2MDM_WAKEUP},

	{"qcom,ap2mdm-chnlrdy-gpio",     AP2MDM_CHNLRDY},

	{"qcom,mdm2ap-wakeup-gpio",     MDM2AP_WAKEUP},

	{"qcom,ap2mdm-vddmin-gpio",     AP2MDM_VDDMIN},

	{"qcom,mdm2ap-vddmin-gpio",     MDM2AP_VDDMIN},
@@ -476,9 +477,9 @@ static long mdm_modem_ioctl(struct file *filp, unsigned int cmd, 
		/* If userspace has reset the peripheral device then

		 * inform the modem here.

		 */

		if (GPIO_IS_VALID(MDM_GPIO(AP2MDM_WAKEUP)))

		if (GPIO_IS_VALID(MDM_GPIO(AP2MDM_CHNLRDY)))

				gpio_direction_output(

				   MDM_GPIO(AP2MDM_WAKEUP), 1);

				   MDM_GPIO(AP2MDM_CHNLRDY), 1);



		/* If successful, start a timer to check that the mdm2ap_status

		 * gpio goes high.
@@ -1176,6 +1177,13 @@ static int mdm_configure_ipc(struct mdm_device *mdev) 
			goto fatal_err;

		}

	}

	if (GPIO_IS_VALID(MDM_GPIO(AP2MDM_CHNLRDY))) {

		if (gpio_request(MDM_GPIO(AP2MDM_CHNLRDY), "AP2MDM_CHNLRDY")) {

			pr_err("%s Failed to configure AP2MDM_CHNLRDY gpio\n",

				   __func__);

			goto fatal_err;

		}

	}

	if (GPIO_IS_VALID(MDM_GPIO(USB_SW))) {

		if (gpio_request(MDM_GPIO(USB_SW), "USB_SW"))

			pr_err("%s Failed to configure usb switch gpio\n",
@@ -1185,8 +1193,8 @@ static int mdm_configure_ipc(struct mdm_device *mdev) 
	gpio_direction_output(MDM_GPIO(AP2MDM_STATUS), 0);

	gpio_direction_output(MDM_GPIO(AP2MDM_ERRFATAL), 0);



	if (GPIO_IS_VALID(MDM_GPIO(AP2MDM_WAKEUP)))

		gpio_direction_output(MDM_GPIO(AP2MDM_WAKEUP), 0);

	if (GPIO_IS_VALID(MDM_GPIO(AP2MDM_CHNLRDY)))

		gpio_direction_output(MDM_GPIO(AP2MDM_CHNLRDY), 0);



	gpio_direction_input(MDM_GPIO(MDM2AP_STATUS));

	gpio_direction_input(MDM_GPIO(MDM2AP_ERRFATAL));

arch/arm/mach-msm/mdm_private.h

+1 −0
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ enum { 
	AP2MDM_SOFT_RESET,

	MDM2AP_WAKEUP,

	AP2MDM_WAKEUP,

	AP2MDM_CHNLRDY,

	AP2MDM_KPDPWR,

	AP2MDM_PMIC_PWR_EN,

	MDM2AP_PBLRDY,