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path: root/drivers/cpufreq/powernow-k8.c
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2012-01-27cpufreq: Add support for x86 cpuinfo auto loading v4Andi Kleen
This marks all the x86 cpuinfo tables to the CPU specific device drivers, to allow auto loading by udev. This should simplify the distribution startup scripts for this greatly. I didn't add MODULE_DEVICE_IDs to the centrino and p4-clockmod drivers, because those probably shouldn't be auto loaded and the acpi driver be used instead (not fully sure on that, would appreciate feedback) The old nforce drivers autoload based on the PCI ID. ACPI cpufreq is autoloaded in another patch. v3: Autoload gx based on PCI IDs only. Remove cpu check (Dave Jones) v4: Use newly introduce HW_PSTATE feature for powernow-k8 loading Cc: Dave Jones <davej@redhat.com> Cc: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Thomas Renninger <trenn@suse.de> Acked-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2012-01-06[CPUFREQ] powernow-k8: Update copyright, maintainer and documentation ↵Andreas Herrmann
information Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com> Signed-off-by: Dave Jones <davej@redhat.com>
2012-01-06[CPUFREQ] powernow-k8: Fix indexing issueAndreas Herrmann
The driver uses the pstate number from the status register as index in its table of ACPI pstates (powernow_table). This is wrong as this is not a 1-to-1 mapping. For example we can have _PSS information to just utilize Pstate 0 and Pstate 4, ie. powernow-k8: Core Performance Boosting: on. powernow-k8: 0 : pstate 0 (2200 MHz) powernow-k8: 1 : pstate 4 (1400 MHz) In this example the driver's powernow_table has just 2 entries. Using the pstate number (4) as index into this table is just plain wrong. Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com> Signed-off-by: Dave Jones <davej@redhat.com>
2012-01-06[CPUFREQ] powernow-k8: Avoid Pstate MSR accesses on systems supporting CPBAndreas Herrmann
Due to CPB we can't directly map SW Pstates to Pstate MSRs. Get rid of the paranoia check. (assuming that the ACPI Pstate information is correct.) Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com> Signed-off-by: Dave Jones <davej@redhat.com>
2011-06-16[CPUFREQ] powernow-k8: Don't try to transition if the pstate is incorrectKonrad Rzeszutek Wilk
This patch augments the pstate transition code to error out (instead of returning 0) when an incorrect pstate is provided. Suggested-by: Borislav Petkov <bp@alien8.de> CC: andre.przywara@amd.com CC: Mark.Langsdorf@amd.com Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Dave Jones <davej@redhat.com>
2011-06-16[CPUFREQ] powernow-k8: Don't notify of successful transition if we failed ↵Konrad Rzeszutek Wilk
(vid case). Before this patch if we failed the vid transition would still try to submit the "new" frequencies to cpufreq. That is incorrect - also we could submit a non-existing frequency value which would cause cpufreq to crash. The ultimate fix is in cpufreq to deal with incorrect values, but this patch improves the error recovery in the AMD powernowk8 driver. The failure that was reported was as follows: powernow-k8: Found 1 AMD Athlon(tm) 64 Processor 3700+ (1 cpu cores) (version 2.20.00) powernow-k8: fid 0x2 (1000 MHz), vid 0x12 powernow-k8: fid 0xa (1800 MHz), vid 0xa powernow-k8: fid 0xc (2000 MHz), vid 0x8 powernow-k8: fid 0xe (2200 MHz), vid 0x8 Marking TSC unstable due to cpufreq changes powernow-k8: fid trans failed, fid 0x2, curr 0x0 BUG: unable to handle kernel paging request at ffff880807e07b78 IP: [<ffffffff81479163>] cpufreq_stats_update+0x46/0x5b ... And transition fails and data->currfid ends up with 0. Since the machine does not support 800Mhz value when the calculation is done ('find_khz_freq_from_fid(data->currfid);') it reports the new frequency as 800000 which is bogus. This patch fixes the issue during target setting. The patch however does not fix the issue in 'powernowk8_cpu_init' where the pol->cur can also be set with the 800000 value: pol->cur = find_khz_freq_from_fid(data->currfid); dprintk("policy current frequency %d kHz\n", pol->cur); /* min/max the cpu is capable of */ if (cpufreq_frequency_table_cpuinfo(pol, data->powernow_table)) { The fix for that looks to update cpufreq_frequency_table_cpuinfo to check pol->cur.... but that would cause an regression in how the acpi-cpufreq driver works (it sets cpu->cur after calling cpufreq_frequency_table_cpuinfo). Instead the fix will be to let cpufreq gracefully handle bogus data (another patch). Acked-by: Borislav Petkov <bp@alien8.de> CC: andre.przywara@amd.com CC: Mark.Langsdorf@amd.com Reported-by: Tobias Diedrich <ranma+xen@tdiedrich.de> Tested-by: Tobias Diedrich <ranma+xen@tdiedrich.de> [v1: Rebased on v3.0-rc2, reduced patch to deal with vid case] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Signed-off-by: Dave Jones <davej@redhat.com>
2011-05-19[CPUFREQ] Move x86 drivers to drivers/cpufreq/Dave Jones
Signed-off-by: Dave Jones <davej@redhat.com>