From: Erwan Le Ray <erwan.leray@foss.st.com> To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Jiri Slaby <jslaby@suse.com>, Maxime Coquelin <mcoquelin.stm32@gmail.com>, Alexandre Torgue <alexandre.torgue@foss.st.com> Cc: <linux-serial@vger.kernel.org>, <linux-stm32@st-md-mailman.stormreply.com>, <linux-arm-kernel@lists.infradead.org>, <linux-kernel@vger.kernel.org>, Erwan Le Ray <erwan.leray@foss.st.com>, Fabrice Gasnier <fabrice.gasnier@foss.st.com>, Valentin Caron <valentin.caron@foss.st.com> Subject: [PATCH 12/13] serial: stm32: fix tx_empty condition Date: Fri, 19 Feb 2021 18:47:35 +0100 [thread overview] Message-ID: <20210219174736.1022-13-erwan.leray@foss.st.com> (raw) In-Reply-To: <20210219174736.1022-1-erwan.leray@foss.st.com> In "tx_empty", we should poll TC bit in both DMA and PIO modes (instead of TXE) to check transmission data register has been transmitted independently of the FIFO mode. TC indicates that both transmit register and shift register are empty. When shift register is empty, tx_empty should return TIOCSER_TEMT instead of TC value. Cleans the USART_CR_TC TCCF register define (transmission complete clear flag) as it is duplicate of USART_ICR_TCCF. Fixes: 48a6092fb41f ("serial: stm32-usart: Add STM32 USART Driver") Signed-off-by: Erwan Le Ray <erwan.leray@foss.st.com> diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c index dcc309fd5d2f..114408f3892a 100644 --- a/drivers/tty/serial/stm32-usart.c +++ b/drivers/tty/serial/stm32-usart.c @@ -515,7 +515,10 @@ static unsigned int stm32_usart_tx_empty(struct uart_port *port) struct stm32_port *stm32_port = to_stm32_port(port); struct stm32_usart_offsets *ofs = &stm32_port->info->ofs; - return readl_relaxed(port->membase + ofs->isr) & USART_SR_TXE; + if (readl_relaxed(port->membase + ofs->isr) & USART_SR_TC) + return TIOCSER_TEMT; + + return 0; } static void stm32_usart_set_mctrl(struct uart_port *port, unsigned int mctrl) diff --git a/drivers/tty/serial/stm32-usart.h b/drivers/tty/serial/stm32-usart.h index d4c916e78d40..e305462d0de6 100644 --- a/drivers/tty/serial/stm32-usart.h +++ b/drivers/tty/serial/stm32-usart.h @@ -127,9 +127,6 @@ struct stm32_usart_info stm32h7_info = { /* Dummy bits */ #define USART_SR_DUMMY_RX BIT(16) -/* USART_ICR (F7) */ -#define USART_CR_TC BIT(6) - /* USART_DR */ #define USART_DR_MASK GENMASK(8, 0) -- 2.17.1
WARNING: multiple messages have this Message-ID (diff)
From: Erwan Le Ray <erwan.leray@foss.st.com> To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Jiri Slaby <jslaby@suse.com>, Maxime Coquelin <mcoquelin.stm32@gmail.com>, Alexandre Torgue <alexandre.torgue@foss.st.com> Cc: Valentin Caron <valentin.caron@foss.st.com>, Erwan Le Ray <erwan.leray@foss.st.com>, linux-kernel@vger.kernel.org, Fabrice Gasnier <fabrice.gasnier@foss.st.com>, linux-serial@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org Subject: [PATCH 12/13] serial: stm32: fix tx_empty condition Date: Fri, 19 Feb 2021 18:47:35 +0100 [thread overview] Message-ID: <20210219174736.1022-13-erwan.leray@foss.st.com> (raw) In-Reply-To: <20210219174736.1022-1-erwan.leray@foss.st.com> In "tx_empty", we should poll TC bit in both DMA and PIO modes (instead of TXE) to check transmission data register has been transmitted independently of the FIFO mode. TC indicates that both transmit register and shift register are empty. When shift register is empty, tx_empty should return TIOCSER_TEMT instead of TC value. Cleans the USART_CR_TC TCCF register define (transmission complete clear flag) as it is duplicate of USART_ICR_TCCF. Fixes: 48a6092fb41f ("serial: stm32-usart: Add STM32 USART Driver") Signed-off-by: Erwan Le Ray <erwan.leray@foss.st.com> diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c index dcc309fd5d2f..114408f3892a 100644 --- a/drivers/tty/serial/stm32-usart.c +++ b/drivers/tty/serial/stm32-usart.c @@ -515,7 +515,10 @@ static unsigned int stm32_usart_tx_empty(struct uart_port *port) struct stm32_port *stm32_port = to_stm32_port(port); struct stm32_usart_offsets *ofs = &stm32_port->info->ofs; - return readl_relaxed(port->membase + ofs->isr) & USART_SR_TXE; + if (readl_relaxed(port->membase + ofs->isr) & USART_SR_TC) + return TIOCSER_TEMT; + + return 0; } static void stm32_usart_set_mctrl(struct uart_port *port, unsigned int mctrl) diff --git a/drivers/tty/serial/stm32-usart.h b/drivers/tty/serial/stm32-usart.h index d4c916e78d40..e305462d0de6 100644 --- a/drivers/tty/serial/stm32-usart.h +++ b/drivers/tty/serial/stm32-usart.h @@ -127,9 +127,6 @@ struct stm32_usart_info stm32h7_info = { /* Dummy bits */ #define USART_SR_DUMMY_RX BIT(16) -/* USART_ICR (F7) */ -#define USART_CR_TC BIT(6) - /* USART_DR */ #define USART_DR_MASK GENMASK(8, 0) -- 2.17.1 _______________________________________________ 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:[~2021-02-19 17:52 UTC|newest] Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-02-19 17:47 [PATCH 00/13] stm32 usart various fixes Erwan Le Ray 2021-02-19 17:47 ` Erwan Le Ray 2021-02-19 17:47 ` [PATCH 01/13] serial: stm32: fix probe and remove order for dma Erwan Le Ray 2021-02-19 17:47 ` Erwan Le Ray 2021-02-19 17:47 ` [PATCH 02/13] serial: stm32: fix startup by enabling usart for reception Erwan Le Ray 2021-02-19 17:47 ` Erwan Le Ray 2021-02-19 17:47 ` [PATCH 03/13] serial: stm32: fix incorrect characters on console Erwan Le Ray 2021-02-19 17:47 ` Erwan Le Ray 2021-02-19 17:47 ` [PATCH 04/13] serial: stm32: fix TX and RX FIFO thresholds Erwan Le Ray 2021-02-19 17:47 ` Erwan Le Ray 2021-02-19 17:47 ` [PATCH 05/13] serial: stm32: fix a deadlock condition with wakeup event Erwan Le Ray 2021-02-19 17:47 ` Erwan Le Ray 2021-02-19 17:47 ` [PATCH 06/13] serial: stm32: fix wake-up flag handling Erwan Le Ray 2021-02-19 17:47 ` Erwan Le Ray 2021-02-19 17:47 ` [PATCH 07/13] serial: stm32: fix a deadlock in set_termios Erwan Le Ray 2021-02-19 17:47 ` Erwan Le Ray 2021-02-19 17:47 ` [PATCH 08/13] serial: stm32: fix tx dma completion, release channel Erwan Le Ray 2021-02-19 17:47 ` Erwan Le Ray 2021-02-19 17:47 ` [PATCH 09/13] serial: stm32: call stm32_transmit_chars locked Erwan Le Ray 2021-02-19 17:47 ` Erwan Le Ray 2021-02-19 17:47 ` [PATCH 10/13] serial: stm32: fix FIFO flush in startup and set_termios Erwan Le Ray 2021-02-19 17:47 ` Erwan Le Ray 2021-02-19 17:47 ` [PATCH 11/13] serial: stm32: add FIFO flush when port is closed Erwan Le Ray 2021-02-19 17:47 ` Erwan Le Ray 2021-02-19 17:47 ` Erwan Le Ray [this message] 2021-02-19 17:47 ` [PATCH 12/13] serial: stm32: fix tx_empty condition Erwan Le Ray 2021-02-19 17:47 ` [PATCH 13/13] serial: stm32: add support for "flush_buffer" ops Erwan Le Ray 2021-02-19 17:47 ` Erwan Le Ray 2021-03-03 19:31 ` [PATCH 00/13] stm32 usart various fixes Greg Kroah-Hartman 2021-03-03 19:31 ` Greg Kroah-Hartman
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=20210219174736.1022-13-erwan.leray@foss.st.com \ --to=erwan.leray@foss.st.com \ --cc=alexandre.torgue@foss.st.com \ --cc=fabrice.gasnier@foss.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 \ --cc=valentin.caron@foss.st.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: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.