Author: avg
Date: Mon Jun 25 08:50:46 2018
New Revision: 335621
URL: https://svnweb.freebsd.org/changeset/base/335621
Log:
MFC r333999: uchcom: add a hardware configuration tweak seen in Linux code
Modified:
stable/10/sys/dev/usb/serial/uchcom.c
Directory Properties:
stable/10/ (props changed)
Modified: stable/10/sys/dev/usb/serial/uchcom.c
==============================================================================
--- stable/10/sys/dev/usb/serial/uchcom.c Mon Jun 25 08:50:06 2018
(r335620)
+++ stable/10/sys/dev/usb/serial/uchcom.c Mon Jun 25 08:50:46 2018
(r335621)
@@ -616,8 +616,12 @@ uchcom_set_baudrate(struct uchcom_softc *sc, uint32_t
if (uchcom_calc_divider_settings(&dv, rate))
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_REG_BPS_PRE, dv.dv_prescaler,
+ UCHCOM_REG_BPS_PRE, dv.dv_prescaler | 0x80,
UCHCOM_REG_BPS_DIV, dv.dv_div);
uchcom_write_reg(sc,
UCHCOM_REG_BPS_MOD, dv.dv_mod,
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