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| author |   Tony Lindgren <tony@atomide.com> | 2021-03-23 09:43:26 +0200 |
|---|---|---|
| committer |   Daniel Lezcano <daniel.lezcano@linaro.org> | 2021-04-08 16:41:18 +0200 |
| commit | 25de4ce5ed02994aea8bc111d133308f6fd62566 (patch) | |
| tree | 74bd4c307d545f9caf89b26617d3b8c007bc392d /arch/arm/boot/dts/dra7-l4.dtsi | |
| parent | clocksource/drivers/timer-ti-dm: Prepare to handle dra7 timer wrap issue (diff) | |
| download | linux-dev-25de4ce5ed02994aea8bc111d133308f6fd62566.tar.xz linux-dev-25de4ce5ed02994aea8bc111d133308f6fd62566.zip | |
clocksource/drivers/timer-ti-dm: Handle dra7 timer wrap errata i940
There is a timer wrap issue on dra7 for the ARM architected timer.
In a typical clock configuration the timer fails to wrap after 388 days.
To work around the issue, we need to use timer-ti-dm percpu timers instead.
Let's configure dmtimer3 and 4 as percpu timers by default, and warn about
the issue if the dtb is not configured properly.
Let's do this as a single patch so it can be backported to v5.8 and later
kernels easily. Note that this patch depends on earlier timer-ti-dm
systimer posted mode fixes, and a preparatory clockevent patch
"clocksource/drivers/timer-ti-dm: Prepare to handle dra7 timer wrap issue".
For more information, please see the errata for "AM572x Sitara Processors
Silicon Revisions 1.1, 2.0":
https://www.ti.com/lit/er/sprz429m/sprz429m.pdf
The concept is based on earlier reference patches done by Tero Kristo and
Keerthy.
Cc: Keerthy <j-keerthy@ti.com>
Cc: Tero Kristo <kristo@kernel.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20210323074326.28302-3-tony@atomide.com
Diffstat (limited to 'arch/arm/boot/dts/dra7-l4.dtsi')
| -rw-r--r-- | arch/arm/boot/dts/dra7-l4.dtsi | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm/boot/dts/dra7-l4.dtsi b/arch/arm/boot/dts/dra7-l4.dtsi index 3bf90d9e3335..a294a02f2d23 100644 --- a/arch/arm/boot/dts/dra7-l4.dtsi +++ b/arch/arm/boot/dts/dra7-l4.dtsi @@ -1168,7 +1168,7 @@ }; }; - target-module@34000 { /* 0x48034000, ap 7 46.0 */ + timer3_target: target-module@34000 { /* 0x48034000, ap 7 46.0 */ compatible = "ti,sysc-omap4-timer", "ti,sysc"; reg = <0x34000 0x4>, <0x34010 0x4>; @@ -1195,7 +1195,7 @@ }; }; - target-module@36000 { /* 0x48036000, ap 9 4e.0 */ + timer4_target: target-module@36000 { /* 0x48036000, ap 9 4e.0 */ compatible = "ti,sysc-omap4-timer", "ti,sysc"; reg = <0x36000 0x4>, <0x36010 0x4>; |