| Message ID | 20220712115306.26471-3-kabel@kernel.org |
|---|---|
| State | New |
| Headers | show |
| Series | ftdi_sio driver improvements | expand |
On Tue, 12 Jul 2022 18:27:28 +0100 Rob Pearce <rob@flitspace.org.uk> wrote: > On 12/07/2022 12:53, Marek Behún wrote: > > From: Pali Rohár <pali@kernel.org> > > > > Add lower checks for requested baud rate for FT8U232AM, FT232BM, FT2232C, > > FT232RL, FTX, FT2232H, FT4232H and FT232H. For all of these the minimum > > baud rate they can generate is 183 Baud. > > > > Signed-off-by: Pali Rohár <pali@kernel.org> > > Tested-by: Marek Behún <kabel@kernel.org> > > Signed-off-by: Marek Behún <kabel@kernel.org> > > --- > > drivers/usb/serial/ftdi_sio.c | 6 +++--- > > 1 file changed, 3 insertions(+), 3 deletions(-) > > > > diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c > > index ea40f367e70c..717b97f4e094 100644 > > --- a/drivers/usb/serial/ftdi_sio.c > > +++ b/drivers/usb/serial/ftdi_sio.c > > @@ -1330,7 +1330,7 @@ static u32 get_ftdi_divisor(struct tty_struct *tty, > > } > > break; > > case FT8U232AM: /* 8U232AM chip */ > > - if (baud <= 3000000) { > > + if (baud >= 183 && baud <= 3000000) { > > div_value = ftdi_232am_baud_to_divisor(baud); > > } else { > > dev_dbg(dev, "%s - Baud rate too high!\n", __func__); > Due to the above change, this debug message is now incorrect. Thx for noticing that. I will update. Also I will probably do some more refactors, I am not yet sure. Marek > > @@ -1343,7 +1343,7 @@ static u32 get_ftdi_divisor(struct tty_struct *tty, > > case FT2232C: /* FT2232C chip */ > > case FT232RL: /* FT232RL chip */ > > case FTX: /* FT-X series */ > > - if (baud <= 3000000) { > > + if (baud >= 183 && baud <= 3000000) { > > u16 product_id = le16_to_cpu( > > port->serial->dev->descriptor.idProduct); > > if (((product_id == FTDI_NDI_HUC_PID) || > > @@ -1367,7 +1367,7 @@ static u32 get_ftdi_divisor(struct tty_struct *tty, > > case FT232H: /* FT232H chip */ > > if ((baud <= 12000000) && (baud >= 1200)) { > > div_value = ftdi_2232h_baud_to_divisor(baud); > > - } else if (baud < 1200) { > > + } else if (baud >= 183 && baud < 1200) { > > div_value = ftdi_232bm_baud_to_divisor(baud); > > } else { > > dev_dbg(dev, "%s - Baud rate too high!\n", __func__); > As above > >
diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c index ea40f367e70c..717b97f4e094 100644 --- a/drivers/usb/serial/ftdi_sio.c +++ b/drivers/usb/serial/ftdi_sio.c @@ -1330,7 +1330,7 @@ static u32 get_ftdi_divisor(struct tty_struct *tty, } break; case FT8U232AM: /* 8U232AM chip */ - if (baud <= 3000000) { + if (baud >= 183 && baud <= 3000000) { div_value = ftdi_232am_baud_to_divisor(baud); } else { dev_dbg(dev, "%s - Baud rate too high!\n", __func__); @@ -1343,7 +1343,7 @@ static u32 get_ftdi_divisor(struct tty_struct *tty, case FT2232C: /* FT2232C chip */ case FT232RL: /* FT232RL chip */ case FTX: /* FT-X series */ - if (baud <= 3000000) { + if (baud >= 183 && baud <= 3000000) { u16 product_id = le16_to_cpu( port->serial->dev->descriptor.idProduct); if (((product_id == FTDI_NDI_HUC_PID) || @@ -1367,7 +1367,7 @@ static u32 get_ftdi_divisor(struct tty_struct *tty, case FT232H: /* FT232H chip */ if ((baud <= 12000000) && (baud >= 1200)) { div_value = ftdi_2232h_baud_to_divisor(baud); - } else if (baud < 1200) { + } else if (baud >= 183 && baud < 1200) { div_value = ftdi_232bm_baud_to_divisor(baud); } else { dev_dbg(dev, "%s - Baud rate too high!\n", __func__);