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drivers: bluetooth: silabs: Set maximum TX power

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Honor Kconfig option `BT_CTLR_TX_PWR_ANTENNA` for limiting the maximum TX
power. The default value for this option is 0 dBm, which means that after
this change the actual TX power is likely lower than before, unless
increased by this option.

Signed-off-by: Kalle Kietäväinen <kalle.kietavainen@silabs.com>
This commit is contained in:
Kalle Kietäväinen 2025-02-11 14:48:37 +02:00 • committed by Benjamin Cabé
commit c8e93401d0
2 changed files with 20 additions and 0 deletions
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15
drivers/bluetooth/hci/hci_silabs_efr32.c
View file

@ -52,6 +52,7 @@ static struct k_fifo slz_rx_fifo;
/* FIXME: these functions should come from the SiSDK headers! */ /* FIXME: these functions should come from the SiSDK headers! */
void BTLE_LL_EventRaise(uint32_t events); void BTLE_LL_EventRaise(uint32_t events);
void BTLE_LL_Process(uint32_t events); void BTLE_LL_Process(uint32_t events);
int16_t BTLE_LL_SetMaxPower(int16_t power);
bool sli_pending_btctrl_events(void); bool sli_pending_btctrl_events(void);
RAIL_Handle_t BTLE_LL_GetRadioHandle(void); RAIL_Handle_t BTLE_LL_GetRadioHandle(void);
@ -256,6 +257,18 @@ static void slz_rx_thread_func(void *p1, void *p2, void *p3)
} }
} }
static void slz_set_tx_power(int16_t max_power_dbm)
{
const int16_t max_power_cbm = max_power_dbm * 10;
const int16_t actual_max_power_cbm = BTLE_LL_SetMaxPower(max_power_cbm);
const int16_t actual_max_power_dbm = DIV_ROUND_CLOSEST(actual_max_power_cbm, 10);
if (actual_max_power_dbm != max_power_dbm) {
LOG_WRN("Unable to set max TX power to %d dBm, actual max is %d dBm", max_power_dbm,
actual_max_power_dbm);
}
}
static int slz_bt_open(const struct device *dev, bt_hci_recv_t recv) static int slz_bt_open(const struct device *dev, bt_hci_recv_t recv)
{ {
struct hci_data *hci = dev->data; struct hci_data *hci = dev->data;
@ -303,6 +316,8 @@ static int slz_bt_open(const struct device *dev, bt_hci_recv_t recv)
goto deinit; goto deinit;
} }
slz_set_tx_power(CONFIG_BT_CTLR_TX_PWR_ANTENNA);
sl_btctrl_init_adv(); sl_btctrl_init_adv();
sl_btctrl_init_scan(); sl_btctrl_init_scan();
sl_btctrl_init_conn(); sl_btctrl_init_conn();

5
modules/hal_silabs/simplicity_sdk/src/blob_stubs.c
View file

@ -31,6 +31,11 @@ void BTLE_LL_Process(uint32_t events)
{ {
} }
int16_t BTLE_LL_SetMaxPower(int16_t power)
{
return 0;
}
void sl_btctrl_disable_2m_phy(void) void sl_btctrl_disable_2m_phy(void)
{ {
} }