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Commit 61d912b9 authored by Umesh Vats's avatar Umesh Vats Committed by Gerrit - the friendly Code Review server
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Bluetooth: Assert XO GPIO before asserting BT_EN 



Make change in sequence to assert XO GPIO before BT_EN
GPIO is asserted for valid  latch in HW.

Change-Id: Ibe3bd668adb284c861619d3b195006b7e9b106eb
Signed-off-by: default avatarUmesh Vats <uvats@codeaurora.org>
parent df578599

drivers/bluetooth/btpower.c

+44 −37
Original line number Diff line number Diff line
@@ -353,6 +353,45 @@ static int bt_clk_disable(struct bt_power_clk_data *clk) 
	return rc;

}



static void btpower_set_xo_reset_gpio_state(bool enable)

{

	int xo_reset_gpio =  bt_power_pdata->xo_gpio_sys_rst;

	int retry = 0;

	int rc = 0;



	if (xo_reset_gpio < 0)

		return;



retry_gpio_req:

	rc = gpio_request(xo_reset_gpio, "xo_reset_gpio_n");

	if (rc) {

		if (retry++ < XO_RESET_RETRY_COUNT_MAX) {

			/* wait for ~(10 - 20) ms */

			usleep_range(10000, 20000);

			goto retry_gpio_req;

		}

	}



	if (rc) {

		pr_err("%s: unable to request XO reset gpio %d (%d)\n",

			__func__, xo_reset_gpio, rc);

		return;

	}



	if (enable) {

		gpio_direction_output(xo_reset_gpio, 1);

		/*XO CLK must be asserted for some time before BT_EN */

		usleep_range(100, 200);

	} else {

		/* Assert XO CLK ~(2-5)ms before off for valid latch in HW */

		usleep_range(2000, 5000);

		gpio_direction_output(xo_reset_gpio, 0);

	}



	gpio_free(xo_reset_gpio);

}





static int bt_configure_gpios(int on)

{

	int rc = 0;
@@ -360,9 +399,7 @@ static int bt_configure_gpios(int on) 
	int wl_reset_gpio = bt_power_pdata->wl_gpio_sys_rst;

	int bt_sw_ctrl_gpio  =  bt_power_pdata->bt_gpio_sw_ctrl;

	int bt_debug_gpio  =  bt_power_pdata->bt_gpio_debug;

	int xo_reset_gpio =  bt_power_pdata->xo_gpio_sys_rst;

	int assert_dbg_gpio = 0;

	int retry = 0;



	if (on) {

		rc = gpio_request(bt_reset_gpio, "bt_sys_rst_n");
@@ -396,6 +433,8 @@ static int bt_configure_gpios(int on) 


		if ((wl_reset_gpio < 0) ||

			((wl_reset_gpio >= 0) && gpio_get_value(wl_reset_gpio))) {



			btpower_set_xo_reset_gpio_state(true);

			pr_info("%s: BTON: Asserting BT_EN\n", __func__);

			rc = gpio_direction_output(bt_reset_gpio, 1);

			if (rc) {
@@ -404,6 +443,7 @@ static int bt_configure_gpios(int on) 
			}

			PWR_SRC_STATUS_SET(BT_RESET_GPIO,

				gpio_get_value(bt_reset_gpio));

			btpower_set_xo_reset_gpio_state(false);

		}

		if ((wl_reset_gpio >= 0) && (gpio_get_value(wl_reset_gpio) == 0)) {

			if (gpio_get_value(bt_reset_gpio)) {
@@ -420,6 +460,7 @@ static int bt_configure_gpios(int on) 
			pr_info("%s:add 100ms delay for AON output to fully discharge\n",

				 __func__);

			msleep(100);

			btpower_set_xo_reset_gpio_state(true);

			rc = gpio_direction_output(bt_reset_gpio, 1);

			if (rc) {

				pr_err("%s: Unable to set direction\n", __func__);
@@ -427,43 +468,9 @@ static int bt_configure_gpios(int on) 
			}

			bt_power_src_status[BT_RESET_GPIO] =

				gpio_get_value(bt_reset_gpio);

			btpower_set_xo_reset_gpio_state(false);

		}



		pr_info("xo_reset_gpio(%d)\n", xo_reset_gpio);



		if (xo_reset_gpio > 0) {

retry_gpio_req:

			rc = gpio_request(xo_reset_gpio, "xo_reset_gpio_n");

			if (rc) {

				if (retry++ < XO_RESET_RETRY_COUNT_MAX) {

					/* wait for ~(10 - 20) ms */

					usleep_range(10000, 20000);

					goto retry_gpio_req;

				}

			}



			if (rc) {

				pr_err("%s: unable to request XO reset gpio %d (%d)\n",

					__func__, xo_reset_gpio, rc);

			} else {

				pr_info("%s: gpio_request for xo_reset_gpio succeed\n",

					__func__);

				// XO clk GPIO must be asserted for some time

				rc = gpio_direction_output(xo_reset_gpio, 1);

				if (rc) {

					pr_err("%s: Unable to set direction of xo_reset_gpio\n",

						__func__);

				}

				usleep_range(2000, 5000);

				// pull XO clk GPIO low after 2 ms delay

				rc = gpio_direction_output(xo_reset_gpio, 0);

				if (rc) {

					pr_err("%s: Unable to set direction of xo_reset_gpio\n",

						__func__);

				}

				gpio_free(xo_reset_gpio);

			}

		}

		msleep(50);

		/*  Check  if  SW_CTRL  is  asserted  */

		if  (bt_sw_ctrl_gpio  >=  0)  {