diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-6.1/950-0698-serial-8250-Add-NOMSI-bug-for-bcm2835aux.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-6.1/950-0698-serial-8250-Add-NOMSI-bug-for-bcm2835aux.patch | 103 |
1 files changed, 0 insertions, 103 deletions
diff --git a/target/linux/bcm27xx/patches-6.1/950-0698-serial-8250-Add-NOMSI-bug-for-bcm2835aux.patch b/target/linux/bcm27xx/patches-6.1/950-0698-serial-8250-Add-NOMSI-bug-for-bcm2835aux.patch deleted file mode 100644 index 728e433fb8..0000000000 --- a/target/linux/bcm27xx/patches-6.1/950-0698-serial-8250-Add-NOMSI-bug-for-bcm2835aux.patch +++ /dev/null @@ -1,103 +0,0 @@ -From 501e87c5f421654e1bb6fd4a25de46420549cae8 Mon Sep 17 00:00:00 2001 -From: Phil Elwell <phil@raspberrypi.com> -Date: Mon, 24 Apr 2023 11:48:31 +0100 -Subject: [PATCH] serial: 8250: Add NOMSI bug for bcm2835aux - -The BCM2835 mini-UART has no modem status interrupt, causing all -transmission to stop, never to use, if a speed change ever happens -while the CTS signal is high. - -Add a simple polling mechanism in order to allow recovery in that -situation. - -Signed-off-by: Phil Elwell <phil@raspberrypi.com> ---- - drivers/tty/serial/8250/8250.h | 1 + - drivers/tty/serial/8250/8250_bcm2835aux.c | 1 + - drivers/tty/serial/8250/8250_core.c | 15 +++++++++++++++ - drivers/tty/serial/8250/8250_port.c | 9 +++++++++ - 4 files changed, 26 insertions(+) - ---- a/drivers/tty/serial/8250/8250.h -+++ b/drivers/tty/serial/8250/8250.h -@@ -92,6 +92,7 @@ struct serial8250_config { - #define UART_BUG_NOMSR BIT(2) /* UART has buggy MSR status bits (Au1x00) */ - #define UART_BUG_THRE BIT(3) /* UART has buggy THRE reassertion */ - #define UART_BUG_TXRACE BIT(5) /* UART Tx fails to set remote DR */ -+#define UART_BUG_NOMSI BIT(6) /* UART has no modem status interrupt */ - - - #ifdef CONFIG_SERIAL_8250_SHARE_IRQ ---- a/drivers/tty/serial/8250/8250_bcm2835aux.c -+++ b/drivers/tty/serial/8250/8250_bcm2835aux.c -@@ -109,6 +109,7 @@ static int bcm2835aux_serial_probe(struc - UPF_SKIP_TEST | UPF_IOREMAP; - up.port.rs485_config = serial8250_em485_config; - up.port.rs485_supported = serial8250_em485_supported; -+ up.bugs |= UART_BUG_NOMSI; - up.rs485_start_tx = bcm2835aux_rs485_start_tx; - up.rs485_stop_tx = bcm2835aux_rs485_stop_tx; - ---- a/drivers/tty/serial/8250/8250_core.c -+++ b/drivers/tty/serial/8250/8250_core.c -@@ -252,6 +252,18 @@ static void serial8250_timeout(struct ti - mod_timer(&up->timer, jiffies + uart_poll_timeout(&up->port)); - } - -+static void serial8250_cts_poll_timeout(struct timer_list *t) -+{ -+ struct uart_8250_port *up = from_timer(up, t, timer); -+ unsigned long flags; -+ -+ spin_lock_irqsave(&up->port.lock, flags); -+ serial8250_modem_status(up); -+ spin_unlock_irqrestore(&up->port.lock, flags); -+ if (up->port.hw_stopped) -+ mod_timer(&up->timer, jiffies + 1); -+} -+ - static void serial8250_backup_timeout(struct timer_list *t) - { - struct uart_8250_port *up = from_timer(up, t, timer); -@@ -314,6 +326,9 @@ static void univ8250_setup_timer(struct - uart_poll_timeout(port) + HZ / 5); - } - -+ if (up->bugs & UART_BUG_NOMSI) -+ up->timer.function = serial8250_cts_poll_timeout; -+ - /* - * If the "interrupt" for this port doesn't correspond with any - * hardware interrupt, we use a timer-based system. The original ---- a/drivers/tty/serial/8250/8250_port.c -+++ b/drivers/tty/serial/8250/8250_port.c -@@ -1553,6 +1553,9 @@ static void serial8250_stop_tx(struct ua - serial_icr_write(up, UART_ACR, up->acr); - } - serial8250_rpm_put(up); -+ -+ if (port->hw_stopped && (up->bugs & UART_BUG_NOMSI)) -+ mod_timer(&up->timer, jiffies + 1); - } - - static inline void __start_tx(struct uart_port *port) -@@ -1663,6 +1666,9 @@ static void serial8250_start_tx(struct u - struct uart_8250_port *up = up_to_u8250p(port); - struct uart_8250_em485 *em485 = up->em485; - -+ if (up->bugs & UART_BUG_NOMSI) -+ del_timer(&up->timer); -+ - if (!port->x_char && uart_circ_empty(&port->state->xmit)) - return; - -@@ -1883,6 +1889,9 @@ unsigned int serial8250_modem_status(str - uart_handle_cts_change(port, status & UART_MSR_CTS); - - wake_up_interruptible(&port->state->port.delta_msr_wait); -+ } else if (up->bugs & UART_BUG_NOMSI && port->hw_stopped && -+ status & UART_MSR_CTS) { -+ uart_handle_cts_change(port, status & UART_MSR_CTS); - } - - return status; |