mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-25 00:11:13 +00:00
13391465ba
No content changes. Only take over the new patch locations. Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
94 lines
3.8 KiB
Diff
94 lines
3.8 KiB
Diff
From 3cc8011171186d906c547bc6f0c1f8e350edc7cf Mon Sep 17 00:00:00 2001
|
|
From: Markus Stockhausen <markus.stockhausen@gmx.de>
|
|
Date: Mon, 3 Oct 2022 14:45:21 +0200
|
|
Subject: [PATCH] realtek: resurrect timer driver
|
|
|
|
Now that we provide a clock driver for the Reltek SOCs the CPU frequency might
|
|
change on demand. This has direct visible effects during operation
|
|
|
|
- the CEVT 4K timer is no longer a stable clocksource
|
|
- after CPU frequencies changes time calculation works wrong
|
|
- sched_clock falls back to kernel default interval (100 Hz)
|
|
- timestamps in dmesg have only 2 digits left
|
|
|
|
[ 0.000000] sched_clock: 32 bits at 100 Hz, resolution 10000000ns, wraps ...
|
|
[ 0.060000] pid_max: default: 32768 minimum: 301
|
|
[ 0.070000] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
|
|
[ 0.070000] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
|
|
[ 0.080000] dyndbg: Ignore empty _ddebug table in a CONFIG_DYNAMIC_DEBUG_CORE build
|
|
[ 0.090000] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, ...
|
|
|
|
Looking around where we can start the CEVT timer for RTL930X is a good basis.
|
|
Initially it was developed as a clocksource driver for the broken timer in that
|
|
specific SOC series. Afterwards it was shifted around to the CEVT location,
|
|
got SMP enablement and lost its clocksource feature. So we at least have
|
|
something to copy from. As the timers on these devices are well understood
|
|
the implementation follows this way:
|
|
|
|
- leave the RTL930X implementation as is
|
|
- provide a new driver for RTL83XX devices only
|
|
- swap RTL930X driver at a later time
|
|
|
|
Like the clock driver this patch contains a self contained module that is SOC
|
|
independet and already provides full support for the RTL838X, RTL839X and
|
|
RTL930X devices. Some of the new (or reestablished) features are:
|
|
|
|
- simplified initialization routines
|
|
- SMP setup with CPU hotplug framework
|
|
- derived from LXB clock speed
|
|
- supplied clocksource
|
|
- dedicated register functions for better readability
|
|
- documentation about some caveats
|
|
|
|
Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
|
|
[remove unused header includes, remove old CONFIG_MIPS dependency, add
|
|
REALTEK_ prefix to driver symbol]
|
|
Signed-off-by: Sander Vanheule <sander@svanheule.net>
|
|
|
|
---
|
|
drivers/clocksource/Kconfig | 12 +++
|
|
drivers/clocksource/Makefile | 1 +
|
|
include/linux/cpuhotplug.h | 1 +
|
|
3 files changed, 14 insertions(+)
|
|
|
|
--- a/drivers/clocksource/Kconfig
|
|
+++ b/drivers/clocksource/Kconfig
|
|
@@ -134,6 +134,17 @@ config RDA_TIMER
|
|
help
|
|
Enables the support for the RDA Micro timer driver.
|
|
|
|
+config REALTEK_OTTO_TIMER
|
|
+ bool "Clocksource/timer for the Realtek Otto platform"
|
|
+ select COMMON_CLK
|
|
+ select TIMER_OF
|
|
+ help
|
|
+ This driver adds support for the timers found in the Realtek RTL83xx
|
|
+ and RTL93xx SoCs series. This includes chips such as RTL8380, RTL8381
|
|
+ and RTL832, as well as chips from the RTL839x series, such as RTL8390
|
|
+ RT8391, RTL8392, RTL8393 and RTL8396 and chips of the RTL930x series
|
|
+ such as RTL9301, RTL9302 or RTL9303.
|
|
+
|
|
config SUN4I_TIMER
|
|
bool "Sun4i timer driver" if COMPILE_TEST
|
|
depends on HAS_IOMEM
|
|
--- a/drivers/clocksource/Makefile
|
|
+++ b/drivers/clocksource/Makefile
|
|
@@ -59,6 +59,7 @@ obj-$(CONFIG_MILBEAUT_TIMER) += timer-mi
|
|
obj-$(CONFIG_SPRD_TIMER) += timer-sprd.o
|
|
obj-$(CONFIG_NPCM7XX_TIMER) += timer-npcm7xx.o
|
|
obj-$(CONFIG_RDA_TIMER) += timer-rda.o
|
|
+obj-$(CONFIG_REALTEK_OTTO_TIMER) += timer-rtl-otto.o
|
|
|
|
obj-$(CONFIG_ARC_TIMERS) += arc_timer.o
|
|
obj-$(CONFIG_ARM_ARCH_TIMER) += arm_arch_timer.o
|
|
--- a/include/linux/cpuhotplug.h
|
|
+++ b/include/linux/cpuhotplug.h
|
|
@@ -181,6 +181,7 @@ enum cpuhp_state {
|
|
CPUHP_AP_MARCO_TIMER_STARTING,
|
|
CPUHP_AP_MIPS_GIC_TIMER_STARTING,
|
|
CPUHP_AP_ARC_TIMER_STARTING,
|
|
+ CPUHP_AP_REALTEK_TIMER_STARTING,
|
|
CPUHP_AP_RISCV_TIMER_STARTING,
|
|
CPUHP_AP_CLINT_TIMER_STARTING,
|
|
CPUHP_AP_CSKY_TIMER_STARTING,
|