brcm2708: update to latest patches from the RPi foundation

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 0 insertions, 110 deletions

diff --git a/target/linux/brcm2708/patches-4.19/950-0298-sc16is7xx-Fix-for-Unexpected-interrupt-8.patch b/target/linux/brcm2708/patches-4.19/950-0298-sc16is7xx-Fix-for-Unexpected-interrupt-8.patch
deleted file mode 100644
index 8c980ce43c..0000000000
--- a/target/linux/brcm2708/patches-4.19/950-0298-sc16is7xx-Fix-for-Unexpected-interrupt-8.patch
+++ /dev/null
@@ -1,110 +0,0 @@
-From 2328af8468b09a20258488b2126449aa8539ee5a Mon Sep 17 00:00:00 2001
-From: Phil Elwell <phil@raspberrypi.org>
-Date: Fri, 18 May 2018 10:26:59 +0100
-Subject: [PATCH 298/703] sc16is7xx: Fix for "Unexpected interrupt: 8"
-
-The SC16IS752 has an Enhanced Feature Register which is aliased at the
-same address as the Interrupt Identification Register; accessing it
-requires that a magic value is written to the Line Configuration
-Register. If an interrupt is raised while the EFR is mapped in then
-the ISR won't be able to access the IIR, leading to the "Unexpected
-interrupt" error messages.
-
-Avoid the problem by claiming a mutex around accesses to the EFR
-register, also claiming the mutex in the interrupt handler work
-item (this is equivalent to disabling interrupts to interlock against
-a non-threaded interrupt handler).
-
-See: https://github.com/raspberrypi/linux/issues/2529
-
-Signed-off-by: Phil Elwell <phil@raspberrypi.org>
----
- drivers/tty/serial/sc16is7xx.c | 28 ++++++++++++++++++++++++++++
- 1 file changed, 28 insertions(+)
-
---- a/drivers/tty/serial/sc16is7xx.c
-+++ b/drivers/tty/serial/sc16is7xx.c
-@@ -328,6 +328,7 @@ struct sc16is7xx_port {
- 	struct kthread_worker		kworker;
- 	struct task_struct		*kworker_task;
- 	struct kthread_work		irq_work;
-+	struct mutex			efr_lock;
- 	struct sc16is7xx_one		p[0];
- };
- 
-@@ -499,6 +500,21 @@ static int sc16is7xx_set_baud(struct uar
- 		div /= 4;
- 	}
- 
-+	/* In an amazing feat of design, the Enhanced Features Register shares
-+	 * the address of the Interrupt Identification Register, and is
-+	 * switched in by writing a magic value (0xbf) to the Line Control
-+	 * Register. Any interrupt firing during this time will see the EFR
-+	 * where it expects the IIR to be, leading to "Unexpected interrupt"
-+	 * messages.
-+	 *
-+	 * Prevent this possibility by claiming a mutex while accessing the
-+	 * EFR, and claiming the same mutex from within the interrupt handler.
-+	 * This is similar to disabling the interrupt, but that doesn't work
-+	 * because the bulk of the interrupt processing is run as a workqueue
-+	 * job in thread context.
-+	 */
-+	mutex_lock(&s->efr_lock);
-+
- 	lcr = sc16is7xx_port_read(port, SC16IS7XX_LCR_REG);
- 
- 	/* Open the LCR divisors for configuration */
-@@ -514,6 +530,8 @@ static int sc16is7xx_set_baud(struct uar
- 	/* Put LCR back to the normal mode */
- 	sc16is7xx_port_write(port, SC16IS7XX_LCR_REG, lcr);
- 
-+	mutex_unlock(&s->efr_lock);
-+
- 	sc16is7xx_port_update(port, SC16IS7XX_MCR_REG,
- 			      SC16IS7XX_MCR_CLKSEL_BIT,
- 			      prescaler);
-@@ -698,6 +716,8 @@ static void sc16is7xx_ist(struct kthread
- {
- 	struct sc16is7xx_port *s = to_sc16is7xx_port(ws, irq_work);
- 
-+	mutex_lock(&s->efr_lock);
-+
- 	while (1) {
- 		bool keep_polling = false;
- 		int i;
-@@ -707,6 +727,8 @@ static void sc16is7xx_ist(struct kthread
- 		if (!keep_polling)
- 			break;
- 	}
-+
-+	mutex_unlock(&s->efr_lock);
- }
- 
- static irqreturn_t sc16is7xx_irq(int irq, void *dev_id)
-@@ -901,6 +923,9 @@ static void sc16is7xx_set_termios(struct
- 	if (!(termios->c_cflag & CREAD))
- 		port->ignore_status_mask |= SC16IS7XX_LSR_BRK_ERROR_MASK;
- 
-+	/* As above, claim the mutex while accessing the EFR. */
-+	mutex_lock(&s->efr_lock);
-+
- 	sc16is7xx_port_write(port, SC16IS7XX_LCR_REG,
- 			     SC16IS7XX_LCR_CONF_MODE_B);
- 
-@@ -922,6 +947,8 @@ static void sc16is7xx_set_termios(struct
- 	/* Update LCR register */
- 	sc16is7xx_port_write(port, SC16IS7XX_LCR_REG, lcr);
- 
-+	mutex_unlock(&s->efr_lock);
-+
- 	/* Get baud rate generator configuration */
- 	baud = uart_get_baud_rate(port, termios, old,
- 				  port->uartclk / 16 / 4 / 0xffff,
-@@ -1187,6 +1214,7 @@ static int sc16is7xx_probe(struct device
- 	s->regmap = regmap;
- 	s->devtype = devtype;
- 	dev_set_drvdata(dev, s);
-+	mutex_init(&s->efr_lock);
- 
- 	kthread_init_worker(&s->kworker);
- 	kthread_init_work(&s->irq_work, sc16is7xx_ist);