Messages in this thread | | | Date | Fri, 31 Mar 2023 11:42:30 +0530 | From | Wyes Karny <> | Subject | Re: [PATCH] amd-pstate: Fix amd_pstate mode switch |
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Hi Rafael,
On 30 Mar 20:19, Rafael J. Wysocki wrote: > On Thu, Mar 30, 2023 at 4:13 PM Wyes Karny <wyes.karny@amd.com> wrote: > > > > amd_pstate mode can be changed by writing the mode name to the `status` > > sysfs. But some combinations are not working. Fix this issue by taking > > care of the edge cases. > > > > Before the fix the mode change combination test fails: > > > > #./pst_test.sh > > Test passed: from: disable, to > > Test passed: from: disable, to disable > > Test failed: 1, From mode: disable, to mode: passive > > Test failed: 1, From mode: disable, to mode: active > > Test failed: 1, From mode: passive, to mode: active > > Test passed: from: passive, to disable > > Test failed: 1, From mode: passive, to mode: passive > > Test failed: 1, From mode: passive, to mode: active > > Test failed: 1, From mode: active, to mode: active > > Test passed: from: active, to disable > > Test failed: 1, From mode: active, to mode: passive > > Test failed: 1, From mode: active, to mode: active > > > > After the fix test passes: > > > > #./pst_test.sh > > Test passed: from: disable, to > > Test passed: from: disable, to disable > > Test passed: from: disable, to passive > > Test passed: from: disable, to active > > Test passed: from: passive, to active > > Test passed: from: passive, to disable > > Test passed: from: passive, to passive > > Test passed: from: passive, to active > > Test passed: from: active, to active > > Test passed: from: active, to disable > > Test passed: from: active, to passive > > Test passed: from: active, to active > > > > Fixes: abd61c08ef349 ("cpufreq: amd-pstate: add driver working mode switch support") > > > > Acked-by: Huang Rui <ray.huang@amd.com> > > Reviewed-by: Alexey Kardashevskiy <aik@amd.com> > > Signed-off-by: Wyes Karny <wyes.karny@amd.com> > > > > Cc: "Rafael J. Wysocki" <rafael@kernel.org> > > Cc: Viresh Kumar <viresh.kumar@linaro.org> > > Cc: Mario Limonciello <mario.limonciello@amd.com> > > Cc: Perry Yuan <Perry.Yuan@amd.com> > > This is all fine, but you need to tell me how it interacts with the > amd-pstate changes in linux-next. > > Does it affect the code in linux-next at all or is it only for 6.3-rc? >
This is only for 6.3-rc. The commit 3ca7bc818d8c ("cpufreq: amd-pstate: Add guided mode control support via sysfs") in linux-next may not apply cleanly after this fix. Please let me know if I need to rebase and send the guided mode patches [1].
[1]: https://lore.kernel.org/linux-pm/20230307112740.132338-1-wyes.karny@amd.com/
Thanks, Wyes > > --- > > drivers/cpufreq/amd-pstate.c | 18 ++++++++---------- > > 1 file changed, 8 insertions(+), 10 deletions(-) > > > > diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c > > index 73c7643b2697..8dd46fad151e 100644 > > --- a/drivers/cpufreq/amd-pstate.c > > +++ b/drivers/cpufreq/amd-pstate.c > > @@ -840,22 +840,20 @@ static int amd_pstate_update_status(const char *buf, size_t size) > > > > switch(mode_idx) { > > case AMD_PSTATE_DISABLE: > > - if (!current_pstate_driver) > > - return -EINVAL; > > - if (cppc_state == AMD_PSTATE_ACTIVE) > > - return -EBUSY; > > - cpufreq_unregister_driver(current_pstate_driver); > > - amd_pstate_driver_cleanup(); > > + if (current_pstate_driver) { > > + cpufreq_unregister_driver(current_pstate_driver); > > + amd_pstate_driver_cleanup(); > > + } > > break; > > case AMD_PSTATE_PASSIVE: > > if (current_pstate_driver) { > > if (current_pstate_driver == &amd_pstate_driver) > > return 0; > > cpufreq_unregister_driver(current_pstate_driver); > > - cppc_state = AMD_PSTATE_PASSIVE; > > - current_pstate_driver = &amd_pstate_driver; > > } > > > > + current_pstate_driver = &amd_pstate_driver; > > + cppc_state = AMD_PSTATE_PASSIVE; > > ret = cpufreq_register_driver(current_pstate_driver); > > break; > > case AMD_PSTATE_ACTIVE: > > @@ -863,10 +861,10 @@ static int amd_pstate_update_status(const char *buf, size_t size) > > if (current_pstate_driver == &amd_pstate_epp_driver) > > return 0; > > cpufreq_unregister_driver(current_pstate_driver); > > - current_pstate_driver = &amd_pstate_epp_driver; > > - cppc_state = AMD_PSTATE_ACTIVE; > > } > > > > + current_pstate_driver = &amd_pstate_epp_driver; > > + cppc_state = AMD_PSTATE_ACTIVE; > > ret = cpufreq_register_driver(current_pstate_driver); > > break; > > default: > > -- > > 2.34.1 > >
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