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Message-ID: <20240911050741.14477-4-towinchenmi@gmail.com>
Date: Wed, 11 Sep 2024 13:02:13 +0800
From: Nick Chan <towinchenmi@...il.com>
To: Krzysztof Kozlowski <krzk@...nel.org>,
Alim Akhtar <alim.akhtar@...sung.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jiri Slaby <jirislaby@...nel.org>,
linux-arm-kernel@...ts.infradead.org,
linux-samsung-soc@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-serial@...r.kernel.org
Cc: asahi@...ts.linux.dev,
Nick Chan <towinchenmi@...il.com>,
Janne Grunau <j@...nau.net>,
Neal Gompa <neal@...pa.dev>
Subject: [PATCH v5 3/3] tty: serial: samsung: Fix serial rx on Apple A7-A9
Apple's older A7-A9 SoCs seems to use bit 3 in UTRSTAT as RXTO, which is
enabled by bit 11 in UCON.
Access these bits in addition to the original RXTO and RXTO enable bits,
to allow serial rx to function on A7-A9 SoCs. This change does not
appear to affect the A10 SoC and up.
Tested-by: Janne Grunau <j@...nau.net>
Reviewed-by: Neal Gompa <neal@...pa.dev>
Signed-off-by: Nick Chan <towinchenmi@...il.com>
---
drivers/tty/serial/samsung_tty.c | 17 ++++++++++++-----
include/linux/serial_s3c.h | 18 +++++++++++-------
2 files changed, 23 insertions(+), 12 deletions(-)
diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
index 3fdec06322ac..0d184ee2f9ce 100644
--- a/drivers/tty/serial/samsung_tty.c
+++ b/drivers/tty/serial/samsung_tty.c
@@ -550,6 +550,7 @@ static void s3c24xx_serial_stop_rx(struct uart_port *port)
case TYPE_APPLE_S5L:
s3c24xx_clear_bit(port, APPLE_S5L_UCON_RXTHRESH_ENA, S3C2410_UCON);
s3c24xx_clear_bit(port, APPLE_S5L_UCON_RXTO_ENA, S3C2410_UCON);
+ s3c24xx_clear_bit(port, APPLE_S5L_UCON_RXTO_LEGACY_ENA, S3C2410_UCON);
break;
default:
disable_irq_nosync(ourport->rx_irq);
@@ -963,9 +964,11 @@ static irqreturn_t apple_serial_handle_irq(int irq, void *id)
u32 pend = rd_regl(port, S3C2410_UTRSTAT);
irqreturn_t ret = IRQ_NONE;
- if (pend & (APPLE_S5L_UTRSTAT_RXTHRESH | APPLE_S5L_UTRSTAT_RXTO)) {
+ if (pend & (APPLE_S5L_UTRSTAT_RXTHRESH | APPLE_S5L_UTRSTAT_RXTO |
+ APPLE_S5L_UTRSTAT_RXTO_LEGACY)) {
wr_regl(port, S3C2410_UTRSTAT,
- APPLE_S5L_UTRSTAT_RXTHRESH | APPLE_S5L_UTRSTAT_RXTO);
+ APPLE_S5L_UTRSTAT_RXTHRESH | APPLE_S5L_UTRSTAT_RXTO |
+ APPLE_S5L_UTRSTAT_RXTO_LEGACY);
ret = s3c24xx_serial_rx_irq(ourport);
}
if (pend & APPLE_S5L_UTRSTAT_TXTHRESH) {
@@ -1190,7 +1193,8 @@ static void apple_s5l_serial_shutdown(struct uart_port *port)
ucon = rd_regl(port, S3C2410_UCON);
ucon &= ~(APPLE_S5L_UCON_TXTHRESH_ENA_MSK |
APPLE_S5L_UCON_RXTHRESH_ENA_MSK |
- APPLE_S5L_UCON_RXTO_ENA_MSK);
+ APPLE_S5L_UCON_RXTO_ENA_MSK |
+ APPLE_S5L_UCON_RXTO_LEGACY_ENA_MSK);
wr_regl(port, S3C2410_UCON, ucon);
wr_regl(port, S3C2410_UTRSTAT, APPLE_S5L_UTRSTAT_ALL_FLAGS);
@@ -1287,6 +1291,7 @@ static int apple_s5l_serial_startup(struct uart_port *port)
/* Enable Rx Interrupt */
s3c24xx_set_bit(port, APPLE_S5L_UCON_RXTHRESH_ENA, S3C2410_UCON);
s3c24xx_set_bit(port, APPLE_S5L_UCON_RXTO_ENA, S3C2410_UCON);
+ s3c24xx_set_bit(port, APPLE_S5L_UCON_RXTO_LEGACY_ENA, S3C2410_UCON);
return ret;
}
@@ -2143,13 +2148,15 @@ static int s3c24xx_serial_resume_noirq(struct device *dev)
ucon &= ~(APPLE_S5L_UCON_TXTHRESH_ENA_MSK |
APPLE_S5L_UCON_RXTHRESH_ENA_MSK |
- APPLE_S5L_UCON_RXTO_ENA_MSK);
+ APPLE_S5L_UCON_RXTO_ENA_MSK |
+ APPLE_S5L_UCON_RXTO_LEGACY_ENA_MSK);
if (ourport->tx_enabled)
ucon |= APPLE_S5L_UCON_TXTHRESH_ENA_MSK;
if (ourport->rx_enabled)
ucon |= APPLE_S5L_UCON_RXTHRESH_ENA_MSK |
- APPLE_S5L_UCON_RXTO_ENA_MSK;
+ APPLE_S5L_UCON_RXTO_ENA_MSK |
+ APPLE_S5L_UCON_RXTO_LEGACY_ENA_MSK;
wr_regl(port, S3C2410_UCON, ucon);
diff --git a/include/linux/serial_s3c.h b/include/linux/serial_s3c.h
index 2a934e20ca4b..102aa33d956c 100644
--- a/include/linux/serial_s3c.h
+++ b/include/linux/serial_s3c.h
@@ -246,24 +246,28 @@
S5PV210_UFCON_TXTRIG4 | \
S5PV210_UFCON_RXTRIG4)
-#define APPLE_S5L_UCON_RXTO_ENA 9
-#define APPLE_S5L_UCON_RXTHRESH_ENA 12
-#define APPLE_S5L_UCON_TXTHRESH_ENA 13
-#define APPLE_S5L_UCON_RXTO_ENA_MSK BIT(APPLE_S5L_UCON_RXTO_ENA)
-#define APPLE_S5L_UCON_RXTHRESH_ENA_MSK BIT(APPLE_S5L_UCON_RXTHRESH_ENA)
-#define APPLE_S5L_UCON_TXTHRESH_ENA_MSK BIT(APPLE_S5L_UCON_TXTHRESH_ENA)
+#define APPLE_S5L_UCON_RXTO_ENA 9
+#define APPLE_S5L_UCON_RXTO_LEGACY_ENA 11
+#define APPLE_S5L_UCON_RXTHRESH_ENA 12
+#define APPLE_S5L_UCON_TXTHRESH_ENA 13
+#define APPLE_S5L_UCON_RXTO_ENA_MSK BIT(APPLE_S5L_UCON_RXTO_ENA)
+#define APPLE_S5L_UCON_RXTO_LEGACY_ENA_MSK BIT(APPLE_S5L_UCON_RXTO_LEGACY_ENA)
+#define APPLE_S5L_UCON_RXTHRESH_ENA_MSK BIT(APPLE_S5L_UCON_RXTHRESH_ENA)
+#define APPLE_S5L_UCON_TXTHRESH_ENA_MSK BIT(APPLE_S5L_UCON_TXTHRESH_ENA)
#define APPLE_S5L_UCON_DEFAULT (S3C2410_UCON_TXIRQMODE | \
S3C2410_UCON_RXIRQMODE | \
S3C2410_UCON_RXFIFO_TOI)
#define APPLE_S5L_UCON_MASK (APPLE_S5L_UCON_RXTO_ENA_MSK | \
+ APPLE_S5L_UCON_RXTO_LEGACY_ENA_MSK | \
APPLE_S5L_UCON_RXTHRESH_ENA_MSK | \
APPLE_S5L_UCON_TXTHRESH_ENA_MSK)
+#define APPLE_S5L_UTRSTAT_RXTO_LEGACY BIT(3)
#define APPLE_S5L_UTRSTAT_RXTHRESH BIT(4)
#define APPLE_S5L_UTRSTAT_TXTHRESH BIT(5)
#define APPLE_S5L_UTRSTAT_RXTO BIT(9)
-#define APPLE_S5L_UTRSTAT_ALL_FLAGS GENMASK(9, 4)
+#define APPLE_S5L_UTRSTAT_ALL_FLAGS GENMASK(9, 3)
#ifndef __ASSEMBLY__
--
2.46.0
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