mirror of
https://git.openwrt.org/openwrt/openwrt.git
synced 2024-10-20 14:38:20 +02:00
1343acc8cd
Deleted (upstreamed): bcm27xx/patches-5.10/950-0669-drm-vc4-hdmi-Make-sure-the-device-is-powered-with-CE.patch [1] bcm27xx/patches-5.10/950-0672-drm-vc4-hdmi-Move-initial-register-read-after-pm_run.patch [1] gemini/patches-5.10/0003-ARM-dts-gemini-NAS4220-B-fis-index-block-with-128-Ki.patch [2] Manually rebased: bcm27xx/patches-5.10/950-0675-drm-vc4-hdmi-Drop-devm-interrupt-handler-for-CEC-int.patch Manually reverted: generic/pending-5.10/860-Revert-ASoC-mediatek-Check-for-error-clk-pointer.patch [3] [1] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.10.94&id=55b10b88ac8654fc2f31518aa349a2e643b37f18 [2] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=v5.10.94&id=958a8819d41420d7a74ed922a09cacc0ba3a4218 [3] https://lore.kernel.org/all/trinity-2a727d96-0335-4d03-8f30-e22a0e10112d-1643363480085@3c-app-gmx-bap33/ Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com> Signed-off-by: Daniel Golle <daniel@makrotopia.org>
87 lines
2.5 KiB
Diff
87 lines
2.5 KiB
Diff
From e3f28ae66fd94f4a7a10099a96d6dd5273904943 Mon Sep 17 00:00:00 2001
|
|
From: Phil Elwell <phil@raspberrypi.org>
|
|
Date: Wed, 1 Mar 2017 16:07:39 +0000
|
|
Subject: [PATCH] amba_pl011: Round input clock up
|
|
|
|
The UART clock is initialised to be as close to the requested
|
|
frequency as possible without exceeding it. Now that there is a
|
|
clock manager that returns the actual frequencies, an expected
|
|
48MHz clock is reported as 47999625. If the requested baudrate
|
|
== requested clock/16, there is no headroom and the slight
|
|
reduction in actual clock rate results in failure.
|
|
|
|
Detect cases where it looks like a "round" clock was chosen and
|
|
adjust the reported clock to match that "round" value. As the
|
|
code comment says:
|
|
|
|
/*
|
|
* If increasing a clock by less than 0.1% changes it
|
|
* from ..999.. to ..000.., round up.
|
|
*/
|
|
|
|
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
|
|
---
|
|
drivers/tty/serial/amba-pl011.c | 23 +++++++++++++++++++++--
|
|
1 file changed, 21 insertions(+), 2 deletions(-)
|
|
|
|
--- a/drivers/tty/serial/amba-pl011.c
|
|
+++ b/drivers/tty/serial/amba-pl011.c
|
|
@@ -1642,6 +1642,23 @@ static void pl011_put_poll_char(struct u
|
|
|
|
#endif /* CONFIG_CONSOLE_POLL */
|
|
|
|
+unsigned long pl011_clk_round(unsigned long clk)
|
|
+{
|
|
+ unsigned long scaler;
|
|
+
|
|
+ /*
|
|
+ * If increasing a clock by less than 0.1% changes it
|
|
+ * from ..999.. to ..000.., round up.
|
|
+ */
|
|
+ scaler = 1;
|
|
+ while (scaler * 100000 < clk)
|
|
+ scaler *= 10;
|
|
+ if ((clk + scaler - 1)/scaler % 1000 == 0)
|
|
+ clk = (clk/scaler + 1) * scaler;
|
|
+
|
|
+ return clk;
|
|
+}
|
|
+
|
|
static int pl011_hwinit(struct uart_port *port)
|
|
{
|
|
struct uart_amba_port *uap =
|
|
@@ -1658,7 +1675,7 @@ static int pl011_hwinit(struct uart_port
|
|
if (retval)
|
|
return retval;
|
|
|
|
- uap->port.uartclk = clk_get_rate(uap->clk);
|
|
+ uap->port.uartclk = pl011_clk_round(clk_get_rate(uap->clk));
|
|
|
|
/* Clear pending error and receive interrupts */
|
|
pl011_write(UART011_OEIS | UART011_BEIS | UART011_PEIS |
|
|
@@ -2292,7 +2309,7 @@ static int pl011_console_setup(struct co
|
|
plat->init();
|
|
}
|
|
|
|
- uap->port.uartclk = clk_get_rate(uap->clk);
|
|
+ uap->port.uartclk = pl011_clk_round(clk_get_rate(uap->clk));
|
|
|
|
if (uap->vendor->fixed_options) {
|
|
baud = uap->fixed_baud;
|
|
@@ -2509,6 +2526,7 @@ static struct uart_driver amba_reg = {
|
|
.cons = AMBA_CONSOLE,
|
|
};
|
|
|
|
+#if 0
|
|
static int pl011_probe_dt_alias(int index, struct device *dev)
|
|
{
|
|
struct device_node *np;
|
|
@@ -2540,6 +2558,7 @@ static int pl011_probe_dt_alias(int inde
|
|
|
|
return ret;
|
|
}
|
|
+#endif
|
|
|
|
/* unregisters the driver also if no more ports are left */
|
|
static void pl011_unregister_port(struct uart_amba_port *uap)
|