aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/brcm2708/patches-4.14/950-0123-amba-pl011-Report-AUTOCTS-capability-to-framework.patch
diff options
context:
space:
mode:
authorStijn Tintel <stijn@linux-ipv6.be>2018-11-10 13:03:18 +0200
committerStijn Tintel <stijn@linux-ipv6.be>2018-12-18 23:19:21 +0200
commitf5919b65d4c671fd5083838c7a445f319f9a13c8 (patch)
tree2c791d2a5dea5bbbb0b85f86f74afce2647c0726 /target/linux/brcm2708/patches-4.14/950-0123-amba-pl011-Report-AUTOCTS-capability-to-framework.patch
parent822b4c3b250a254e74407056ccfd5c6aa38da162 (diff)
downloadupstream-f5919b65d4c671fd5083838c7a445f319f9a13c8.tar.gz
upstream-f5919b65d4c671fd5083838c7a445f319f9a13c8.tar.bz2
upstream-f5919b65d4c671fd5083838c7a445f319f9a13c8.zip
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>
Diffstat (limited to 'target/linux/brcm2708/patches-4.14/950-0123-amba-pl011-Report-AUTOCTS-capability-to-framework.patch')
-rw-r--r--target/linux/brcm2708/patches-4.14/950-0123-amba-pl011-Report-AUTOCTS-capability-to-framework.patch43
1 files changed, 43 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.14/950-0123-amba-pl011-Report-AUTOCTS-capability-to-framework.patch b/target/linux/brcm2708/patches-4.14/950-0123-amba-pl011-Report-AUTOCTS-capability-to-framework.patch
new file mode 100644
index 0000000000..f491df2b8a
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.14/950-0123-amba-pl011-Report-AUTOCTS-capability-to-framework.patch
@@ -0,0 +1,43 @@
+From fc4fafeed9a7cc89b4779681f046a8cc0f506dd9 Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.org>
+Date: Wed, 11 Oct 2017 13:48:04 +0100
+Subject: [PATCH 123/454] amba-pl011: Report AUTOCTS capability to framework
+
+The PL011 has full hardware RTS/CTS support which is enabled by
+the driver when flow control is requested. However, it doesn't
+notify the UART framework of the fact, causing the software CTS
+support to be enabled at the same time.
+
+Software CTS triggers the sending of another batch of characters
+when CTS becomes asserted. The pl011 interrupt handler processes
+the CTIS bit before TXIS, which can cause some characters to be
+sent between the time that the TXIS bit first becomes asserted
+and the time it is handled by a call to px011_tx_chars. This
+would be fine were it not for the optimisation in pl011_tx_char
+that assumes the FIFO is half-empty if called from the interrupt
+handler and skips the checking of the FIFO status register before
+sending each character, leading to data loss if the FIFO is more
+than half-full.
+
+Prevent the data loss and improve efficiency by indicating the
+AUTOCTS support.
+
+Signed-off-by: Phil Elwell <phil@raspberrypi.org>
+---
+ drivers/tty/serial/amba-pl011.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+--- a/drivers/tty/serial/amba-pl011.c
++++ b/drivers/tty/serial/amba-pl011.c
+@@ -2063,9 +2063,11 @@ pl011_set_termios(struct uart_port *port
+
+ old_cr |= UART011_CR_CTSEN;
+ uap->autorts = true;
++ port->status |= UPSTAT_AUTOCTS;
+ } else {
+ old_cr &= ~(UART011_CR_CTSEN | UART011_CR_RTSEN);
+ uap->autorts = false;
++ port->status &= ~UPSTAT_AUTOCTS;
+ }
+
+ if (uap->vendor->oversampling) {