46 lines
1.5 KiB
Diff
46 lines
1.5 KiB
Diff
From d696944c67151c7b2c964a42a773622f285713cc Mon Sep 17 00:00:00 2001
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From: Ondrej Jirman <megous@megous.com>
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Date: Sat, 1 Feb 2020 23:40:41 +0100
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Subject: [PATCH 126/323] tty: serial: 8250-dw: Use fifo-size from DTS
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Saves 20ms per port of boot time.
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Signed-off-by: Ondrej Jirman <megous@megous.com>
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---
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drivers/tty/serial/8250/8250_dw.c | 4 ++++
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drivers/tty/serial/8250/8250_port.c | 3 +++
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2 files changed, 7 insertions(+)
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diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
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index 49559731b..ee0d3cc35 100644
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--- a/drivers/tty/serial/8250/8250_dw.c
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+++ b/drivers/tty/serial/8250/8250_dw.c
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@@ -522,6 +522,10 @@ static int dw8250_probe(struct platform_device *pdev)
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/* Always ask for fixed clock rate from a property. */
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device_property_read_u32(dev, "clock-frequency", &p->uartclk);
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+ val = 0;
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+ device_property_read_u32(dev, "fifo-size", &val);
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+ p->fifosize = val;
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+
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/* If there is separate baudclk, get the rate from it. */
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data->clk = devm_clk_get_optional(dev, "baudclk");
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if (data->clk == NULL)
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diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
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index 110a19c51..0f1b8ee8d 100644
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--- a/drivers/tty/serial/8250/8250_port.c
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+++ b/drivers/tty/serial/8250/8250_port.c
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@@ -852,6 +852,9 @@ static int size_fifo(struct uart_8250_port *up)
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unsigned short old_dl;
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int count;
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+ if (up->port.fifosize)
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+ return up->port.fifosize;
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+
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old_lcr = serial_in(up, UART_LCR);
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serial_out(up, UART_LCR, 0);
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old_fcr = serial_in(up, UART_FCR);
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--
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2.34.0
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