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Merge "Bluetooth: Assert XO GPIO before asserting BT_EN"

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This commit is contained in:
qctecmdr 2021-03-21 00:09:17 -07:00 • committed by Gerrit - the friendly Code Review server
commit 50deea12d0
1 changed files with 44 additions and 37 deletions
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81
drivers/bluetooth/btpower.c
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@ -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) {