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31 lines
1.1 KiB
Diff
31 lines
1.1 KiB
Diff
From f3cb675102a2a5a330038c4e748f02b02cec989e Mon Sep 17 00:00:00 2001
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From: Jonathan Bell <jonathan@raspberrypi.com>
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Date: Mon, 22 Jul 2024 09:30:54 +0100
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Subject: [PATCH 1195/1215] tty/serial: pl011: restrict RX burst FIFO threshold
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If the associated DMA controller has lower burst length support than the
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level the FIFO is set to, then bytes will be left in the RX FIFO at the
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end of a DMA block - requiring a round-trip through the timeout interrupt
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handler rather than an end-of-block DMA interrupt.
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Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
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---
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drivers/tty/serial/amba-pl011.c | 6 ++++++
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1 file changed, 6 insertions(+)
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--- a/drivers/tty/serial/amba-pl011.c
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+++ b/drivers/tty/serial/amba-pl011.c
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@@ -487,6 +487,12 @@ static void pl011_dma_probe(struct uart_
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"RX DMA disabled - no residue processing\n");
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return;
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}
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+ /*
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+ * DMA controllers with smaller burst capabilities than 1/4
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+ * the FIFO depth will leave more bytes than expected in the
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+ * RX FIFO if mismatched.
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+ */
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+ rx_conf.src_maxburst = min(caps.max_burst, rx_conf.src_maxburst);
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}
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dmaengine_slave_config(chan, &rx_conf);
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uap->dmarx.chan = chan;
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