From: Erwan Le Ray <erwan.leray@st.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jslaby@suse.com>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
"Alexandre Torgue" <alexandre.torgue@st.com>
Cc: linux-kernel@vger.kernel.org, Erwan Le Ray <erwan.leray@st.com>,
linux-serial@vger.kernel.org,
Fabrice Gasnier <fabrice.gasnier@st.com>,
linux-stm32@st-md-mailman.stormreply.com,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH 3/7] serial: stm32: fix rx data length when parity enabled
Date: Tue, 21 May 2019 17:45:43 +0200 [thread overview]
Message-ID: <1558453547-22866-4-git-send-email-erwan.leray@st.com> (raw)
In-Reply-To: <1558453547-22866-1-git-send-email-erwan.leray@st.com>
- Fixes a rx data error when data length < 8 bits and parity is enabled.
RDR register MSB is used for parity bit reception.
- Adds a mask to ignore MSB when data is get from RDR.
Fixes: 3489187204eb ("serial: stm32: adding dma support")
Signed-off-by: Erwan Le Ray <erwan.leray@st.com>
diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index f6b7393..0a7953e 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -194,8 +194,8 @@ static int stm32_pending_rx(struct uart_port *port, u32 *sr, int *last_res,
return 0;
}
-static unsigned long
-stm32_get_char(struct uart_port *port, u32 *sr, int *last_res)
+static unsigned long stm32_get_char(struct uart_port *port, u32 *sr,
+ int *last_res)
{
struct stm32_port *stm32_port = to_stm32_port(port);
struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
@@ -205,10 +205,13 @@ static int stm32_pending_rx(struct uart_port *port, u32 *sr, int *last_res,
c = stm32_port->rx_buf[RX_BUF_L - (*last_res)--];
if ((*last_res) == 0)
*last_res = RX_BUF_L;
- return c;
} else {
- return readl_relaxed(port->membase + ofs->rdr);
+ c = readl_relaxed(port->membase + ofs->rdr);
+ /* apply RDR data mask */
+ c &= stm32_port->rdr_mask;
}
+
+ return c;
}
static void stm32_receive_chars(struct uart_port *port, bool threaded)
@@ -679,6 +682,7 @@ static void stm32_set_termios(struct uart_port *port, struct ktermios *termios,
cr2 |= USART_CR2_STOP_2B;
bits = stm32_get_databits(termios);
+ stm32_port->rdr_mask = (BIT(bits) - 1);
if (cflag & PARENB) {
bits++;
diff --git a/drivers/tty/serial/stm32-usart.h b/drivers/tty/serial/stm32-usart.h
index 8d34802..30d2433 100644
--- a/drivers/tty/serial/stm32-usart.h
+++ b/drivers/tty/serial/stm32-usart.h
@@ -254,6 +254,7 @@ struct stm32_port {
bool hw_flow_control;
bool fifoen;
int wakeirq;
+ int rdr_mask; /* receive data register mask */
};
static struct stm32_port stm32_ports[STM32_MAX_PORTS];
--
1.9.1
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-05-21 15:47 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-21 15:45 [PATCH 0/7] usart various fixes for STM32 Erwan Le Ray
2019-05-21 15:45 ` [PATCH 1/7] serial: stm32: fix word length configuration Erwan Le Ray
2019-05-21 15:45 ` [PATCH 2/7] serial: stm32: fix rx error handling Erwan Le Ray
2019-05-21 15:45 ` Erwan Le Ray [this message]
2019-05-21 15:45 ` [PATCH 4/7] serial: stm32: fix transmit_chars when tx is stopped Erwan Le Ray
2019-05-21 15:45 ` [PATCH 5/7] serial: stm32: Add support of TC bit status check Erwan Le Ray
2019-05-21 15:45 ` [PATCH 6/7] serial: stm32: fix wakeup source initialization Erwan Le Ray
2019-05-21 15:45 ` [PATCH 7/7] serial: stm32: fix the get_irq error case Erwan Le Ray
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1558453547-22866-4-git-send-email-erwan.leray@st.com \
--to=erwan.leray@st.com \
--cc=alexandre.torgue@st.com \
--cc=fabrice.gasnier@st.com \
--cc=gregkh@linuxfoundation.org \
--cc=jslaby@suse.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-serial@vger.kernel.org \
--cc=linux-stm32@st-md-mailman.stormreply.com \
--cc=mcoquelin.stm32@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).