| Message ID | 20201026083401.13231-8-mark.cave-ayland@ilande.co.uk |
|---|---|
| State | New |
| Headers | show |
| Series | dev-serial: minor fixes and improvements | expand |
Mark Cave-Ayland, le lun. 26 oct. 2020 08:33:59 +0000, a ecrit: > Also implement the behaviour reported in Linux's ftdi_sio.c whereby if an invalid > data_bits value is provided then the hardware defaults to using 8. > > Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org> > --- > hw/usb/dev-serial.c | 17 +++++++++++++++++ > hw/usb/trace-events | 1 + > 2 files changed, 18 insertions(+) > > diff --git a/hw/usb/dev-serial.c b/hw/usb/dev-serial.c > index 919e25e1d9..4c374d0790 100644 > --- a/hw/usb/dev-serial.c > +++ b/hw/usb/dev-serial.c > @@ -308,6 +308,23 @@ static void usb_serial_handle_control(USBDevice *dev, USBPacket *p, > break; > } > case VendorDeviceOutRequest | FTDI_SET_DATA: > + switch (value & 0xff) { > + case 7: > + s->params.data_bits = 7; > + break; > + case 8: > + s->params.data_bits = 8; > + break; > + default: > + /* > + * According to a comment in Linux's ftdi_sio.c original FTDI > + * chips fall back to 8 data bits for unsupported data_bits > + */ > + trace_usb_serial_unsupported_data_bits(bus->busnr, dev->addr, > + value & 0xff); > + s->params.data_bits = 8; > + } > + > switch (value & FTDI_PARITY) { > case 0: > s->params.parity = 'N'; > diff --git a/hw/usb/trace-events b/hw/usb/trace-events > index 9e984b2e0c..0d0a3e5f2a 100644 > --- a/hw/usb/trace-events > +++ b/hw/usb/trace-events > @@ -327,6 +327,7 @@ usb_serial_handle_control(int bus, int addr, int request, int value) "dev %d:%d > usb_serial_unsupported_parity(int bus, int addr, int value) "dev %d:%d unsupported parity %d" > usb_serial_unsupported_stopbits(int bus, int addr, int value) "dev %d:%d unsupported stop bits %d" > usb_serial_unsupported_control(int bus, int addr, int request, int value) "dev %d:%d got unsupported/bogus control 0x%x, value 0x%x" > +usb_serial_unsupported_data_bits(int bus, int addr, int value) "dev %d:%d unsupported data bits %d, falling back to 8" > usb_serial_bad_token(int bus, int addr) "dev %d:%d bad token" > usb_serial_set_baud(int bus, int addr, int baud) "dev %d:%d baud rate %d" > usb_serial_set_data(int bus, int addr, int parity, int data, int stop) "dev %d:%d parity %c, data bits %d, stop bits %d" > -- > 2.20.1 >
diff --git a/hw/usb/dev-serial.c b/hw/usb/dev-serial.c index 919e25e1d9..4c374d0790 100644 --- a/hw/usb/dev-serial.c +++ b/hw/usb/dev-serial.c @@ -308,6 +308,23 @@ static void usb_serial_handle_control(USBDevice *dev, USBPacket *p, break; } case VendorDeviceOutRequest | FTDI_SET_DATA: + switch (value & 0xff) { + case 7: + s->params.data_bits = 7; + break; + case 8: + s->params.data_bits = 8; + break; + default: + /* + * According to a comment in Linux's ftdi_sio.c original FTDI + * chips fall back to 8 data bits for unsupported data_bits + */ + trace_usb_serial_unsupported_data_bits(bus->busnr, dev->addr, + value & 0xff); + s->params.data_bits = 8; + } + switch (value & FTDI_PARITY) { case 0: s->params.parity = 'N'; diff --git a/hw/usb/trace-events b/hw/usb/trace-events index 9e984b2e0c..0d0a3e5f2a 100644 --- a/hw/usb/trace-events +++ b/hw/usb/trace-events @@ -327,6 +327,7 @@ usb_serial_handle_control(int bus, int addr, int request, int value) "dev %d:%d usb_serial_unsupported_parity(int bus, int addr, int value) "dev %d:%d unsupported parity %d" usb_serial_unsupported_stopbits(int bus, int addr, int value) "dev %d:%d unsupported stop bits %d" usb_serial_unsupported_control(int bus, int addr, int request, int value) "dev %d:%d got unsupported/bogus control 0x%x, value 0x%x" +usb_serial_unsupported_data_bits(int bus, int addr, int value) "dev %d:%d unsupported data bits %d, falling back to 8" usb_serial_bad_token(int bus, int addr) "dev %d:%d bad token" usb_serial_set_baud(int bus, int addr, int baud) "dev %d:%d baud rate %d" usb_serial_set_data(int bus, int addr, int parity, int data, int stop) "dev %d:%d parity %c, data bits %d, stop bits %d"
Also implement the behaviour reported in Linux's ftdi_sio.c whereby if an invalid data_bits value is provided then the hardware defaults to using 8. Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> --- hw/usb/dev-serial.c | 17 +++++++++++++++++ hw/usb/trace-events | 1 + 2 files changed, 18 insertions(+)