6.6-stable patches

added patches:
	serial-8250_pxa-configure-tx_loadsz-to-match-fifo-irq-level.patch

diff --git a/queue-6.6/serial-8250_pxa-configure-tx_loadsz-to-match-fifo-irq-level.patch b/queue-6.6/serial-8250_pxa-configure-tx_loadsz-to-match-fifo-irq-level.patch
new file mode 100644 (file)
index 0000000..f1d87a2
--- /dev/null
+++ b/queue-6.6/serial-8250_pxa-configure-tx_loadsz-to-match-fifo-irq-level.patch
@@ -0,0 +1,35 @@
+From 5208e7ced520a813b4f4774451fbac4e517e78b2 Mon Sep 17 00:00:00 2001
+From: Doug Brown <doug@schmorgal.com>
+Date: Sun, 19 May 2024 12:19:30 -0700
+Subject: serial: 8250_pxa: Configure tx_loadsz to match FIFO IRQ level
+
+From: Doug Brown <doug@schmorgal.com>
+
+commit 5208e7ced520a813b4f4774451fbac4e517e78b2 upstream.
+
+The FIFO is 64 bytes, but the FCR is configured to fire the TX interrupt
+when the FIFO is half empty (bit 3 = 0). Thus, we should only write 32
+bytes when a TX interrupt occurs.
+
+This fixes a problem observed on the PXA168 that dropped a bunch of TX
+bytes during large transmissions.
+
+Fixes: ab28f51c77cd ("serial: rewrite pxa2xx-uart to use 8250_core")
+Signed-off-by: Doug Brown <doug@schmorgal.com>
+Link: https://lore.kernel.org/r/20240519191929.122202-1-doug@schmorgal.com
+Cc: stable <stable@kernel.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ drivers/tty/serial/8250/8250_pxa.c |    1 +
+ 1 file changed, 1 insertion(+)
+
+--- a/drivers/tty/serial/8250/8250_pxa.c
++++ b/drivers/tty/serial/8250/8250_pxa.c
+@@ -124,6 +124,7 @@ static int serial_pxa_probe(struct platf
+       uart.port.regshift = 2;
+       uart.port.irq = irq;
+       uart.port.fifosize = 64;
++      uart.tx_loadsz = 32;
+       uart.port.flags = UPF_IOREMAP | UPF_SKIP_TEST | UPF_FIXED_TYPE;
+       uart.port.dev = &pdev->dev;
+       uart.port.uartclk = clk_get_rate(data->clk);

diff --git a/queue-6.6/series b/queue-6.6/series
index 142dd5a81296f5f3124a7c340424462008ce2d64..5454979fc60a132871992d1bd680bdb35c94b706 100644 (file)
--- a/queue-6.6/series
+++ b/queue-6.6/series
@@ -252,3 +252,4 @@ swiotlb-extend-buffer-pre-padding-to-alloc_align_mask-if-necessary.patch
 nilfs2-fix-potential-kernel-bug-due-to-lack-of-writeback-flag-waiting.patch
 tick-nohz_full-don-t-abuse-smp_call_function_single-in-tick_setup_device.patch
 mm-huge_memory-don-t-unpoison-huge_zero_folio.patch
+serial-8250_pxa-configure-tx_loadsz-to-match-fifo-irq-level.patch