diff options
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.patch | 43 |
1 files changed, 0 insertions, 43 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 deleted file mode 100644 index f491df2b8a..0000000000 --- a/target/linux/brcm2708/patches-4.14/950-0123-amba-pl011-Report-AUTOCTS-capability-to-framework.patch +++ /dev/null @@ -1,43 +0,0 @@ -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) { |