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ar7: unbreak serial console

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Serial output was broken since 3.16 for shared uarts between
kernel and login. Fix this by adding a fix sent upstream.

While at it, drop a useless patch that adds duplicate code.

Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
This commit is contained in:
Jonas Gorski 2017-10-29 23:12:20 +01:00
parent 23145d4276
commit be11b3b1c7
3 changed files with 53 additions and 33 deletions
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48
target/linux/ar7/patches-3.18/002-MIPS-AR7-ensure-the-port-type-s-FCR-value-is-used.patch Normal file
View file

@ -0,0 +1,48 @@
From ee6c9d41de084b2cefd90e5e0c9f30a35f6d3967 Mon Sep 17 00:00:00 2001
From: Jonas Gorski <jonas.gorski@gmail.com>
Date: Sun, 29 Oct 2017 15:50:42 +0100
Subject: [PATCH RFC 3/3] MIPS: AR7: ensure the port type's FCR value is used
Since commit aef9a7bd9b67 ("serial/uart/8250: Add tunable RX interrupt
trigger I/F of FIFO buffers"), the port's default FCR value isn't used
in serial8250_do_set_termios anymore, but copied over once in
serial8250_config_port and then modified as needed.
Unfortunately, serial8250_config_port will never be called if the port
is shared between kernel and userspace, and the port's flag doesn't have
UPF_BOOT_AUTOCONF, which would trigger a serial8250_config_port as well.
This causes garbled output from userspace:
[ 5.220000] random: procd urandom read with 49 bits of entropy available
ers
[kee
Fix this by forcing it to be configured on boot, resulting in the
expected output:
[ 5.250000] random: procd urandom read with 50 bits of entropy available
Press the [f] key and hit [enter] to enter failsafe mode
Press the [1], [2], [3] or [4] key and hit [enter] to select the debug level
Fixes: aef9a7bd9b67 ("serial/uart/8250: Add tunable RX interrupt trigger I/F of FIFO buffers")
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
---
I'm not sure if this is just AR7's issue, or if this points to a general
issue for UARTs used as kernel console and login console with the "fixed"
commit.
arch/mips/ar7/platform.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/mips/ar7/platform.c
+++ b/arch/mips/ar7/platform.c
@@ -581,7 +581,7 @@ static int __init ar7_register_uarts(voi
uart_port.type = PORT_AR7;
uart_port.uartclk = clk_get_rate(bus_clk) / 2;
uart_port.iotype = UPIO_MEM32;
- uart_port.flags = UPF_FIXED_TYPE;
+ uart_port.flags = UPF_FIXED_TYPE | UPF_BOOT_AUTOCONF;
uart_port.regshift = 2;
uart_port.line = 0;

28
target/linux/ar7/patches-3.18/500-serial_kludge.patch
View file

@ -1,28 +0,0 @@
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -329,6 +329,13 @@ static const struct serial8250_config ua
.fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
.flags = UART_CAP_FIFO | UART_CAP_AFE,
},
+ [PORT_AR7] = {
+ .name = "TI-AR7",
+ .fifo_size = 16,
+ .tx_loadsz = 16,
+ .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_00,
+ .flags = UART_CAP_FIFO | UART_CAP_AFE,
+ },
};
/* Uart divisor latch read */
@@ -3168,7 +3175,11 @@ static void serial8250_console_putchar(s
{
struct uart_8250_port *up = up_to_u8250p(port);
+#ifdef CONFIG_AR7
+ wait_for_xmitr(up, BOTH_EMPTY);
+#else
wait_for_xmitr(up, UART_LSR_THRE);
+#endif
serial_port_out(port, UART_TX, ch);
}

10
target/linux/ar7/patches-3.18/950-cpmac_titan.patch
View file

@ -1,6 +1,6 @@
--- a/drivers/net/ethernet/ti/cpmac.c
+++ b/drivers/net/ethernet/ti/cpmac.c
@@ -1146,6 +1146,8 @@ static int cpmac_probe(struct platform_d
@@ -1147,6 +1147,8 @@ static int cpmac_probe(struct platform_d
goto out;
}
@ -9,7 +9,7 @@
dev->irq = platform_get_irq_byname(pdev, "irq");
dev->netdev_ops = &cpmac_netdev_ops;
@@ -1227,7 +1229,7 @@ int cpmac_init(void)
@@ -1228,7 +1230,7 @@ int cpmac_init(void)
cpmac_mii->reset = cpmac_mdio_reset;
cpmac_mii->irq = mii_irqs;
@ -18,8 +18,8 @@
if (!cpmac_mii->priv) {
pr_err("Can't ioremap mdio registers\n");
@@ -1238,10 +1240,16 @@ int cpmac_init(void)
#warning FIXME: unhardcode gpio&reset bits
@@ -1239,10 +1241,16 @@ int cpmac_init(void)
/* FIXME: unhardcode gpio&reset bits */
ar7_gpio_disable(26);
ar7_gpio_disable(27);
- ar7_device_reset(AR7_RESET_BIT_CPMAC_LO);
@ -37,7 +37,7 @@
cpmac_mii->reset(cpmac_mii);
for (i = 0; i < 300; i++) {
@@ -1258,7 +1266,11 @@ int cpmac_init(void)
@@ -1259,7 +1267,11 @@ int cpmac_init(void)
mask = 0;
}