From: Johan Hovold Date: Wed, 31 Aug 2022 08:15:25 +0000 (+0200) Subject: USB: serial: ch341: fix disabled rx timer on older devices X-Git-Tag: v6.6.17~6685^2~2^2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=41ca302a697b64a3dab4676e01d0d11bb184737d;p=platform%2Fkernel%2Flinux-rpi.git USB: serial: ch341: fix disabled rx timer on older devices At least one older CH341 appears to have the RX timer enable bit inverted so that setting it disables the RX timer and prevents the FIFO from emptying until it is full. Only set the RX timer enable bit for devices with version newer than 0x27 (even though this probably affects all pre-0x30 devices). Reported-by: Jonathan Woithe Tested-by: Jonathan Woithe Link: https://lore.kernel.org/r/Ys1iPTfiZRWj2gXs@marvin.atrad.com.au Fixes: 4e46c410e050 ("USB: serial: ch341: reinitialize chip on reconfiguration") Cc: stable@vger.kernel.org # 4.10 Signed-off-by: Johan Hovold --- diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c index 2bcce17..af01a46 100644 --- a/drivers/usb/serial/ch341.c +++ b/drivers/usb/serial/ch341.c @@ -253,8 +253,12 @@ static int ch341_set_baudrate_lcr(struct usb_device *dev, /* * CH341A buffers data until a full endpoint-size packet (32 bytes) * has been received unless bit 7 is set. + * + * At least one device with version 0x27 appears to have this bit + * inverted. */ - val |= BIT(7); + if (priv->version > 0x27) + val |= BIT(7); r = ch341_control_out(dev, CH341_REQ_WRITE_REG, CH341_REG_DIVISOR << 8 | CH341_REG_PRESCALER,