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uchcom: add a hardware configuration tweak seen in Linux code

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Reviewed by:	hselasky
MFC after:	2 weeks
This commit is contained in:
avg 2018-05-21 20:59:15 +00:00
parent e18220fac4
commit d1650aa51e
1 changed files with 5 additions and 1 deletions
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6
sys/dev/usb/serial/uchcom.c
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@ -618,8 +618,12 @@ uchcom_set_baudrate(struct uchcom_softc *sc, uint32_t rate)
if (uchcom_calc_divider_settings(&dv, rate)) if (uchcom_calc_divider_settings(&dv, rate))
return; return;
/*
* According to linux code we need to set bit 7 of UCHCOM_REG_BPS_PRE,
* otherwise the chip will buffer data.
*/
uchcom_write_reg(sc, uchcom_write_reg(sc,
UCHCOM_REG_BPS_PRE, dv.dv_prescaler, UCHCOM_REG_BPS_PRE, dv.dv_prescaler | 0x80,
UCHCOM_REG_BPS_DIV, dv.dv_div); UCHCOM_REG_BPS_DIV, dv.dv_div);
uchcom_write_reg(sc, uchcom_write_reg(sc,
UCHCOM_REG_BPS_MOD, dv.dv_mod, UCHCOM_REG_BPS_MOD, dv.dv_mod,