On 10/02/17 07:10, Hanjun Guo wrote:
> Hi Marc,
>
> On 2017/1/24 19:32, Marc Zyngier wrote:
>> On 24/01/17 10:57, Mark Rutland wrote:
>>> On Tue, Jan 24, 2017 at 06:39:51PM +0800, Hanjun Guo wrote:
>>>> From: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
>>>>
>>>> Add hisilicon timer specific erratum fixes.
>>>>
>>>> Signed-off-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
>>>> ---
>>>> drivers/clocksource/arm_arch_timer.c | 22 ++++++++++++++++++++++
>>>> 1 file changed, 22 insertions(+)
>>>>
>>>> diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
>>>> index 80d6f76..3e62a09 100644
>>>> --- a/drivers/clocksource/arm_arch_timer.c
>>>> +++ b/drivers/clocksource/arm_arch_timer.c
>>>> @@ -1156,10 +1156,32 @@ struct gtdt_arch_timer_fixup {
>>>> void *context;
>>>> };
>>>>
>>>> +#ifdef CONFIG_HISILICON_ERRATUM_161010101
>>>> +static void __init hisi_erratum_workaroud_enable(void *context)
>>>> +{
>>>> + int i;
>>>> +
>>>> + for (i = 0; i < ARRAY_SIZE(ool_workarounds); i++) {
>>>> + if (!strcmp(context, ool_workarounds[i].id)) {
>>>> + timer_unstable_counter_workaround = &ool_workarounds[i];
>>>> + static_branch_enable(&arch_timer_read_ool_enabled);
>>>> + pr_info("arch_timer: Enabling workaround for %s\n",
>>>> + timer_unstable_counter_workaround->id);
>>>> + break;
>>>> + }
>>>> + }
>>>> +}
>>>> +#endif
>>>> +
>>>> /* note: this needs to be updated according to the doc of OEM ID
>>>> * and TABLE ID for different board.
>>>> */
>>>> static struct gtdt_arch_timer_fixup arch_timer_quirks[] __initdata = {
>>>> +#ifdef CONFIG_HISILICON_ERRATUM_161010101
>>>> + {"HISI ", "HIP05 ", 0, &hisi_erratum_workaroud_enable, "hisilicon,erratum-161010101"},
>>>> + {"HISI ", "HIP06 ", 0, &hisi_erratum_workaroud_enable, "hisilicon,erratum-161010101"},
>>>> + {"HISI ", "HIP07 ", 0, &hisi_erratum_workaroud_enable, "hisilicon,erratum-161010101"},
>>>> +#endif
>>>> };
>>> NAK. This duplicates logic unnecessarily (for enabling the workaround),
>>> and (ab)uses the id, which was intended to be specific to DT (since it
>>> is a DT property name).
>> Agreed, that's properly revolting.
>>
>>> We should split the matching from the particular workaround (and
>>> enabling thereof), so that we can go straight from ACPI match to
>>> workaround (without having to use the DT id in this manner), and don't
>>> have to duplicate the logic to enable the workaround.
>>>
>>> I believe Marc is looking at some rework in this area which may enable
>>> this, so please wait for that to appear.
>> Yeah, I'm implementing a semi-flexible way to add new quirk types, and
>> the last thing I want to see is two (or more) tables describing the same
>> thing.
>
> Kindly ping, if you have patches in hand, I can test against our platforms,
> thank you very much.
I've just pushed out a branch based on arm64/for-next/core, plus the
HiSi timer workaround:
https://git.kernel.org/cgit/linux/kernel/git/maz/arm-platforms.git/log/?h=timers/errata-rework
I'll post the patches for review once the merge window is open, but
hopefully that should get you going.
Thanks,
M.
--
Jazz is not dead. It just smells funny...
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