brcm2708: add kernel 4.14 support

Patch generation process:
- rebase rpi/rpi-4.14.y on v4.14.89 from linux-stable
- git format-patch v4.14.89

Patches skipped during rebase:
- lan78xx: Read MAC address from DT if present
- lan78xx: Enable LEDs and auto-negotiation
- Revert "softirq: Let ksoftirqd do its job"
- sc16is7xx: Fix for multi-channel stall
- lan78xx: Ignore DT MAC address if already valid
- lan78xx: Simple patch to prevent some crashes
- tcp_write_queue_purge clears all the SKBs in the write queue
- Revert "lan78xx: Simple patch to prevent some crashes"
- lan78xx: Connect phy early
- Arm: mm: ftrace: Only set text back to ro after kernel has been marked ro
- Revert "Revert "softirq: Let ksoftirqd do its job""
- ASoC: cs4265: SOC_SINGLE register value error fix
- Revert "ASoC: cs4265: SOC_SINGLE register value error fix"
- Revert "net: pskb_trim_rcsum() and CHECKSUM_COMPLETE are friends"
- Revert "Revert "net: pskb_trim_rcsum() and CHECKSUM_COMPLETE are friends""

Patches dropped after rebase:
- net: Add non-mainline source for rtl8192cu wlan
- net: Fix rtl8192cu build errors on other platforms
- brcm: adds support for BCM43341 wifi
- brcmfmac: Mute expected startup 'errors'
- ARM64: Fix build break for RTL8187/RTL8192CU wifi
- ARM64: Enable RTL8187/RTL8192CU wifi in build config
- This is the driver for Sony CXD2880 DVB-T2/T tuner + demodulator
- brcmfmac: add CLM download support
- brcmfmac: request_firmware_direct is quieter
- Sets the BCDC priority to constant 0
- brcmfmac: Disable ARP offloading when promiscuous
- brcmfmac: Avoid possible out-of-bounds read
- brcmfmac: Delete redundant length check
- net: rtl8192cu: Normalize indentation
- net: rtl8192cu: Fix implicit fallthrough warnings
- Revert "Sets the BCDC priority to constant 0"
- media: cxd2880: Bump to match 4.18.y version
- media: cxd2880-spi: Bump to match 4.18.y version
- Revert "mm: alloc_contig: re-allow CMA to compact FS pages"
- Revert "Revert "mm: alloc_contig: re-allow CMA to compact FS pages""
- cxd2880: CXD2880_SPI_DRV should select DVB_CXD2880 with
  MEDIA_SUBDRV_AUTOSELECT
- 950-0421-HID-hid-bigbenff-driver-for-BigBen-Interactive-PS3OF.patch
- 950-0453-Add-hid-bigbenff-to-list-of-have_special_driver-for-.patch

Make I2C built-in instead of modular as in upstream defconfig; also the
easiest way to get MFD_ARIZONA enabled, which is required by
kmod-sound-soc-rpi-cirrus.
Add missing compatible strings from
4.9/960-add-rasbperrypi-compatible.patch, using upstream names for
compute modules.
Add extra patch to enable the LEDs on lan78xx.

Compile-tested: bcm2708, bcm2709, bcm2710 (with CONFIG_ALL_KMODS=y)
Runtime-tested: bcm2708, bcm2710

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>

1 files changed, 110 insertions, 0 deletions

diff --git a/target/linux/brcm2708/patches-4.14/950-0311-sc16is7xx-Fix-for-Unexpected-interrupt-8.patch b/target/linux/brcm2708/patches-4.14/950-0311-sc16is7xx-Fix-for-Unexpected-interrupt-8.patch
new file mode 100644
index 0000000000..b01e523a1e
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.14/950-0311-sc16is7xx-Fix-for-Unexpected-interrupt-8.patch
@@ -0,0 +1,110 @@
+From d4601b298709e44a998df772ac1c85707603fde4 Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.org>
+Date: Fri, 18 May 2018 10:26:59 +0100
+Subject: [PATCH 311/454] 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
+@@ -333,6 +333,7 @@ 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];
+ };
+ 
+@@ -504,6 +505,21 @@ 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 */
+@@ -519,6 +535,8 @@ 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);
+@@ -701,6 +719,8 @@ 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;
+@@ -710,6 +730,8 @@ 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)
+@@ -904,6 +926,9 @@ 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);
+ 
+@@ -925,6 +950,8 @@ 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);