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Add kernel 5.15 for RPI4 support

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Ycarus (Yannick Chabanois) 2021-11-24 18:32:01 +01:00
parent e961d478cd
commit df88a19bbd
638 changed files with 239907 additions and 0 deletions
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75
root/target/linux/bcm27xx/patches-5.15/0243-sc16is7xx-Fix-for-hardware-flow-control.patch Normal file
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@ -0,0 +1,75 @@
From a78c7abb44150cf2e63d42867df0d62e64661eea Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.com>
Date: Wed, 13 May 2020 20:10:15 +0100
Subject: [PATCH 243/634] sc16is7xx: Fix for hardware flow control
The SC16IS7XX hardware flow control is mishandled by the driver in
a number of ways:
1. The set_baud method accidentally clears it when setting EFR bit.
2. Even though hardware flow control is enabled, it isn't indicated
back to the serial framework.
3. Applying the flow control clears the EFR bit.
4. The CTS support is not indicated in the return from
sc16is7xx_get_mctrl.
Address all of those issues using a mixture of patches found on the
linked pages.
See: https://github.com/raspberrypi/linux/issues/2542
See: https://www.spinics.net/lists/linux-serial/msg21794.html
Signed-off-by: Phil Elwell <phil@raspberrypi.com>
---
drivers/tty/serial/sc16is7xx.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index f8adcb68c409..2836fc22b1d4 100644
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -523,8 +523,9 @@ static int sc16is7xx_set_baud(struct uart_port *port, int baud)
/* Enable enhanced features */
regcache_cache_bypass(s->regmap, true);
- sc16is7xx_port_write(port, SC16IS7XX_EFR_REG,
- SC16IS7XX_EFR_ENABLE_BIT);
+ sc16is7xx_port_update(port, SC16IS7XX_EFR_REG,
+ SC16IS7XX_EFR_ENABLE_BIT,
+ SC16IS7XX_EFR_ENABLE_BIT);
regcache_cache_bypass(s->regmap, false);
/* Put LCR back to the normal mode */
@@ -839,7 +840,7 @@ static unsigned int sc16is7xx_get_mctrl(struct uart_port *port)
/* DCD and DSR are not wired and CTS/RTS is handled automatically
* so just indicate DSR and CAR asserted
*/
- return TIOCM_DSR | TIOCM_CAR;
+ return TIOCM_DSR | TIOCM_CAR | TIOCM_RI | TIOCM_CTS;
}
static void sc16is7xx_set_mctrl(struct uart_port *port, unsigned int mctrl)
@@ -926,14 +927,19 @@ static void sc16is7xx_set_termios(struct uart_port *port,
regcache_cache_bypass(s->regmap, true);
sc16is7xx_port_write(port, SC16IS7XX_XON1_REG, termios->c_cc[VSTART]);
sc16is7xx_port_write(port, SC16IS7XX_XOFF1_REG, termios->c_cc[VSTOP]);
- if (termios->c_cflag & CRTSCTS)
+ if (termios->c_cflag & CRTSCTS) {
flow |= SC16IS7XX_EFR_AUTOCTS_BIT |
SC16IS7XX_EFR_AUTORTS_BIT;
+ port->status |= UPSTAT_AUTOCTS;
+ };
if (termios->c_iflag & IXON)
flow |= SC16IS7XX_EFR_SWFLOW3_BIT;
if (termios->c_iflag & IXOFF)
flow |= SC16IS7XX_EFR_SWFLOW1_BIT;
+ /* Always set enable enhanced */
+ flow |= SC16IS7XX_EFR_ENABLE_BIT;
+
sc16is7xx_port_write(port, SC16IS7XX_EFR_REG, flow);
regcache_cache_bypass(s->regmap, false);
--
2.33.1