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[111.249.6.6]) by smtp.gmail.com with ESMTPSA id i2sm28904451pgi.94.2019.12.25.05.30.29 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 25 Dec 2019 05:30:30 -0800 (PST) From: Charles Yeh To: gregkh@linuxfoundation.org, johan@kernel.org, linux-usb@vger.kernel.org Cc: charles-yeh@prolific.com.tw, Charles Yeh Subject: [PATCH] USB: serial: pl2303: PL2303HXN can support baud rate are set directly Date: Wed, 25 Dec 2019 21:30:05 +0800 Message-Id: <20191225133005.1617-1-charlesyeh522@gmail.com> X-Mailer: git-send-email 2.24.1.windows.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org PL2303HXN (TYPE_HXN) can program form 1 bps to 12000000 bps and support standard & non-standard baud rates (Note 1) are set directly It doesn't need complicated baud rate division calculation. Note 1: Standard baud rate: 75, 150, 300, 600, 1200, 1800, 2400, 3600, 4800, 7200, 9600,14400, 19200, 28800, 38400, 57600, 115200, 230400, 460800,614400, 921600, 1228800, 2457600, 3000000, 6000000 Non-standard baud rate (1 ~ 12000000): 1, 2, 5, 22, 55, 60, 75, 80, 123, 130, 150, 180, 187, 200, 300, 340, 400,..... 115200, 230400, 460800, 474747, 515151, 614400, 921600, .. 1000000,.. 7000000,.. 12000000 Signed-off-by: Charles Yeh --- --- drivers/usb/serial/pl2303.c | 24 ++++++++++++++---------- 1 file changed, 14 insertions(+), 10 deletions(-) diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c index aab737e1e7b6..63d354a92db9 100644 --- a/drivers/usb/serial/pl2303.c +++ b/drivers/usb/serial/pl2303.c @@ -565,17 +565,21 @@ static void pl2303_encode_baud_rate(struct tty_struct *tty, if (!baud) return; - if (spriv->type->max_baud_rate) - baud = min_t(speed_t, baud, spriv->type->max_baud_rate); - /* - * Use direct method for supported baud rates, otherwise use divisors. - */ - baud_sup = pl2303_get_supported_baud_rate(baud); - - if (baud == baud_sup) + if (spriv->type == &pl2303_type_data[TYPE_HXN]) { baud = pl2303_encode_baud_rate_direct(buf, baud); - else - baud = pl2303_encode_baud_rate_divisor(buf, baud); + } else { + if (spriv->type->max_baud_rate) + baud = min_t(speed_t, baud, spriv->type->max_baud_rate); + /* + * Use direct method for supported baud rates, otherwise use divisors. + */ + baud_sup = pl2303_get_supported_baud_rate(baud); + + if (baud == baud_sup) + baud = pl2303_encode_baud_rate_direct(buf, baud); + else + baud = pl2303_encode_baud_rate_divisor(buf, baud); + } /* Save resulting baud rate */ tty_encode_baud_rate(tty, baud, baud); -- 2.20.1