| Message ID | 20220624115940.272422-1-Perry.Yuan@amd.com |
|---|---|
| State | New |
| Headers | show |
| Series | ACPI: bus: Fix osc_sb_cppc_not_supported check | expand |
[AMD Official Use Only - General] Hi Rafael: > -----Original Message----- > From: Rafael J. Wysocki <rafael@kernel.org> > Sent: Saturday, June 25, 2022 12:12 AM > To: Yuan, Perry <Perry.Yuan@amd.com> > Cc: Huang, Ray <Ray.Huang@amd.com>; Limonciello, Mario > <Mario.Limonciello@amd.com>; Rafael J. Wysocki <rafael@kernel.org>; Len > Brown <lenb@kernel.org>; Mika Westerberg > <mika.westerberg@linux.intel.com>; ACPI Devel Maling List <linux- > acpi@vger.kernel.org>; Linux Kernel Mailing List <linux-kernel@vger.kernel.org>; > Fontenot, Nathan <Nathan.Fontenot@amd.com>; Su, Jinzhou (Joe) > <Jinzhou.Su@amd.com>; Huang, Shimmer <Xinmei.Huang@amd.com>; Du, > Xiaojian <Xiaojian.Du@amd.com>; Meng, Li (Jassmine) <Li.Meng@amd.com>; > Linux PM <linux-pm@vger.kernel.org> > Subject: Re: [PATCH] ACPI: bus: Fix osc_sb_cppc_not_supported check > > [CAUTION: External Email] > > On Fri, Jun 24, 2022 at 2:00 PM Perry Yuan <Perry.Yuan@amd.com> wrote: > > > > The patch fixs the osc_sb_cppc_not_supported variable checking > > Otherwise the cppc acpi driver will be failed to register causing AMD > > pstate driver failed to load when calling acpi_cpc_valid() > > > > Fixes: c42fa24b447("ACPI: bus: Avoid using CPPC if not supported by > > firmware") > > Signed-off-by: Perry Yuan <Perry.Yuan@amd.com> > > --- > > drivers/acpi/bus.c | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c index > > 4d7c51a33b01..9731e4a1e338 100644 > > --- a/drivers/acpi/bus.c > > +++ b/drivers/acpi/bus.c > > @@ -359,7 +359,7 @@ static void > acpi_bus_osc_negotiate_platform_control(void) > > } > > > > #ifdef CONFIG_ACPI_CPPC_LIB > > - osc_sb_cppc_not_supported = !(capbuf_ret[OSC_SUPPORT_DWORD] & > > + osc_sb_cppc_not_supported = !(capbuf_ret[OSC_SUPPORT_DWORD] && > > (OSC_SB_CPC_SUPPORT | OSC_SB_CPCV2_SUPPORT)); > > This certainly is not a correct fix, because it causes osc_sb_cppc_not_supported > to always be true if capbuf_ret[OSC_SUPPORT_DWORD] is not zero. > > > #endif That is true, I will send another fix solution soon. Perry > > > > -- > > 2.25.1 > >
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c index 4d7c51a33b01..9731e4a1e338 100644 --- a/drivers/acpi/bus.c +++ b/drivers/acpi/bus.c @@ -359,7 +359,7 @@ static void acpi_bus_osc_negotiate_platform_control(void) } #ifdef CONFIG_ACPI_CPPC_LIB - osc_sb_cppc_not_supported = !(capbuf_ret[OSC_SUPPORT_DWORD] & + osc_sb_cppc_not_supported = !(capbuf_ret[OSC_SUPPORT_DWORD] && (OSC_SB_CPC_SUPPORT | OSC_SB_CPCV2_SUPPORT)); #endif
The patch fixs the osc_sb_cppc_not_supported variable checking Otherwise the cppc acpi driver will be failed to register causing AMD pstate driver failed to load when calling acpi_cpc_valid() Fixes: c42fa24b447("ACPI: bus: Avoid using CPPC if not supported by firmware") Signed-off-by: Perry Yuan <Perry.Yuan@amd.com> --- drivers/acpi/bus.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)