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02 Apr 2024 08:42:23 -0700 Received: by black.fi.intel.com (Postfix, from userid 1003) id 7A6E5525; Tue, 2 Apr 2024 18:42:20 +0300 (EEST) From: Andy Shevchenko To: Greg Kroah-Hartman , Andy Shevchenko , linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org Cc: Jiri Slaby Subject: [PATCH v1 07/16] serial: max3100: Enable TIOCM_LOOP Date: Tue, 2 Apr 2024 18:38:13 +0300 Message-ID: <20240402154219.3583679-8-andriy.shevchenko@linux.intel.com> X-Mailer: git-send-email 2.43.0.rc1.1.gbec44491f096 In-Reply-To: <20240402154219.3583679-1-andriy.shevchenko@linux.intel.com> References: <20240402154219.3583679-1-andriy.shevchenko@linux.intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Enable or disable loopback at run-time. Signed-off-by: Andy Shevchenko --- drivers/tty/serial/max3100.c | 26 ++++++++++++++------------ 1 file changed, 14 insertions(+), 12 deletions(-) diff --git a/drivers/tty/serial/max3100.c b/drivers/tty/serial/max3100.c index d4f0ea97a698..dd98f8037b60 100644 --- a/drivers/tty/serial/max3100.c +++ b/drivers/tty/serial/max3100.c @@ -32,14 +32,12 @@ /** * struct plat_max3100 - MAX3100 SPI UART platform data - * @loopback: force MAX3100 in loopback * @crystal: 1 for 3.6864 Mhz, 0 for 1.8432 * * You should use this structure in your machine description to specify * how the MAX3100 is connected. */ struct plat_max3100 { - int loopback; int crystal; }; @@ -109,6 +107,7 @@ struct max3100_port { int minor; /* minor number */ int crystal; /* 1 if 3.6864Mhz crystal 0 for 1.8432 */ + int loopback_commit; /* need to change loopback */ int loopback; /* 1 if we are in loopback mode */ /* for handling irqs: need workqueue since we do spi_sync */ @@ -257,7 +256,7 @@ static void max3100_work(struct work_struct *w) struct max3100_port *s = container_of(w, struct max3100_port, work); int rxchars; u16 tx, rx; - int conf, cconf, crts; + int conf, cconf, cloopback, crts; struct circ_buf *xmit = &s->port.state->xmit; dev_dbg(&s->spi->dev, "%s\n", __func__); @@ -268,11 +267,15 @@ static void max3100_work(struct work_struct *w) conf = s->conf; cconf = s->conf_commit; s->conf_commit = 0; + cloopback = s->loopback_commit; + s->loopback_commit = 0; crts = s->rts_commit; s->rts_commit = 0; spin_unlock(&s->conf_lock); if (cconf) max3100_sr(s, MAX3100_WC | conf, &rx); + if (cloopback) + max3100_sr(s, 0x4001, &rx); if (crts) { max3100_sr(s, MAX3100_WD | MAX3100_TE | (s->rts ? MAX3100_RTS : 0), &rx); @@ -397,18 +400,24 @@ static void max3100_set_mctrl(struct uart_port *port, unsigned int mctrl) struct max3100_port *s = container_of(port, struct max3100_port, port); - int rts; + int loopback, rts; dev_dbg(&s->spi->dev, "%s\n", __func__); + loopback = (mctrl & TIOCM_LOOP) > 0; rts = (mctrl & TIOCM_RTS) > 0; spin_lock(&s->conf_lock); + if (s->loopback != loopback) { + s->loopback = loopback; + s->loopback_commit = 1; + } if (s->rts != rts) { s->rts = rts; s->rts_commit = 1; - max3100_dowork(s); } + if (s->loopback_commit || s->rts_commit) + max3100_dowork(s); spin_unlock(&s->conf_lock); } @@ -595,12 +604,6 @@ static int max3100_startup(struct uart_port *port) return -EBUSY; } - if (s->loopback) { - u16 tx, rx; - tx = 0x4001; - max3100_sr(s, tx, &rx); - } - s->conf_commit = 1; max3100_dowork(s); /* wait for clock to settle */ @@ -755,7 +758,6 @@ static int max3100_probe(struct spi_device *spi) spi_set_drvdata(spi, max3100s[i]); pdata = dev_get_platdata(&spi->dev); max3100s[i]->crystal = pdata->crystal; - max3100s[i]->loopback = pdata->loopback; max3100s[i]->minor = i; timer_setup(&max3100s[i]->timer, max3100_timeout, 0); -- 2.43.0.rc1.1.gbec44491f096