AuxXxilium/linux_dsm_epyc7002
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500a3d2eb3
linux_dsm_epyc7002/drivers
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Mika Kuoppala 500a3d2eb3 drm/i915: Fix GT frequency rounding 
When we set and later readback a frequency value through
sysfs interface, igt/pm_rpm assumes that we get same value back
if it matches hw granularity.

On bxt we have found out that this is not always the case.
Currently frequency - hw ratio - frequency conversions round down,
with few exceptions on platforms that have more specific conversions.
On bxt the supported range can be for example from 100Mhz to 650Mhz.
Midpoint is then calculated by test to be 375 which pm_rps uses to find a
closest hw supported frequency. That is 366 (ratio 22),
which it then writes back. But as the rounding down kicks in,
driver actually sets 350 instead of 366, as 366 is 2/3 below 22 * 50/3.

Fix this by rounding to closest instead of rounding down in
freq-ratio-freq conversions.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=92768
Testcase: igt/pm_rps/basic-api
Tested-by: Bob Paauwe <bob.j.paauwe@intel.com>
Cc: Bob Paauwe <bob.j.paauwe@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Bob Paauwe <bob.j.paauwe@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1447435781-23416-1-git-send-email-mika.kuoppala@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
2015-11-16 15:25:34 +02:00
..
accessibility
acpi More power management and ACPI updates for v4.4-rc1 2015-11-12 11:50:33 -08:00
amba
android
ata SCSI misc on 20151113 2015-11-13 20:35:54 -08:00
atm
auxdisplay
base More power management and ACPI updates for v4.4-rc1 2015-11-12 11:50:33 -08:00
bcma
block Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client 2015-11-13 09:24:40 -08:00
bluetooth Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-11-10 18:11:41 -08:00
bus ARM: SoC driver updates for v4.4 2015-11-10 15:00:03 -08:00
cdrom
char Merge tag 'tpmdd-next-20151110' of https://github.com/jsakkine/linux-tpmdd into for-linus 2015-11-12 20:38:04 +11:00
clk h8300 update for v4.4 2015-11-12 15:26:39 -08:00
clocksource Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2015-11-15 09:10:53 -08:00
connector mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd 2015-11-06 17:50:42 -08:00
cpufreq More power management and ACPI updates for v4.4-rc1 2015-11-12 11:50:33 -08:00
cpuidle
crypto More power management and ACPI updates for v4.4-rc1 2015-11-12 11:50:33 -08:00
dca
devfreq
dio
dma dmaengine updates for 4.4-rc1 2015-11-10 10:05:17 -08:00
dma-buf dma-buf/fence: add fence_wait_any_timeout function v2 2015-10-30 01:16:16 -04:00
edac asm-generic cleanups 2015-11-06 14:22:15 -08:00
eisa
extcon
firewire IEEE 1394 subsystem patch: 2015-11-11 10:21:34 -08:00
firmware ARM: SoC driver updates for v4.4 2015-11-10 15:00:03 -08:00
fmc
fpga fpga: socfpga: Fix check of return value of devm_request_irq 2015-10-29 15:20:25 -07:00
gpio asm-generic cleanups 2015-11-06 14:22:15 -08:00
gpu drm/i915: Fix GT frequency rounding 2015-11-16 15:25:34 +02:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid 2015-11-07 12:49:27 -08:00
hsi hsi: controllers:remove redundant code 2015-10-30 16:10:40 +01:00
hv drivers/hv: share Hyper-V SynIC constants with userspace 2015-11-04 16:24:33 +01:00
hwmon ARM: SoC driver updates for v4.4 2015-11-10 15:00:03 -08:00
hwspinlock
hwtracing Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2015-11-13 20:04:17 -08:00
i2c Merge branch 'i2c/for-4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2015-11-10 11:58:25 -08:00
ide mm, page_alloc: rename __GFP_WAIT to __GFP_RECLAIM 2015-11-06 17:50:42 -08:00
idle
iio spi: Updates for v4.4 2015-11-05 13:15:12 -08:00
infiniband SCSI misc on 20151113 2015-11-13 20:35:54 -08:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2015-11-13 21:41:14 -08:00
iommu mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd 2015-11-06 17:50:42 -08:00
ipack
irqchip Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2015-11-15 09:10:53 -08:00
isdn TTY/Serial driver patches for 4.4-rc1 2015-11-04 21:35:12 -08:00
leds spi: Updates for v4.4 2015-11-05 13:15:12 -08:00
lguest
lightnvm block: change ->make_request_fn() and users to return a queue cookie 2015-11-07 10:40:46 -07:00
macintosh
mailbox mailbox: mailbox-test: avoid reading iomem twice 2015-11-04 14:03:04 +05:30
mcb mcb: Destroy IDA on module unload 2015-10-29 09:02:16 +09:00
md Merge branch 'for-4.4/io-poll' of git://git.kernel.dk/linux-block 2015-11-10 17:23:49 -08:00
media netup_unidvb: use pci_set_dma_mask insted of pci_dma_supported 2015-11-10 16:32:11 -08:00
memory ARM: SoC driver updates for v4.4 2015-11-10 15:00:03 -08:00
memstick
message SCSI queue for 4.4. 2015-11-12 07:06:18 -05:00
mfd asm-generic cleanups 2015-11-06 14:22:15 -08:00
misc Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2015-11-13 20:04:17 -08:00
mmc spi: Updates for v4.4 2015-11-05 13:15:12 -08:00
mtd This pull request includes the following UBI/UBIFS changes: 2015-11-10 16:35:06 -08:00
net Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2015-11-13 20:04:17 -08:00
nfc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-11-10 18:11:41 -08:00
ntb NTB: fix 32-bit compiler warning 2015-11-08 16:24:43 -05:00
nubus
nvdimm libnvdimm, pmem: fix size trim in pmem_direct_access() 2015-11-12 09:55:23 -08:00
nvme NVMe: add support for Apple NVMe controller 2015-11-11 09:36:57 -07:00
nvmem
of More power management and ACPI updates for v4.4-rc1 2015-11-12 11:50:33 -08:00
oprofile
parisc pci: remove pci_dma_supported 2015-11-10 16:32:11 -08:00
parport
pci More power management and ACPI updates for v4.4-rc1 2015-11-12 11:50:33 -08:00
pcmcia
perf arm64 updates for 4.4: 2015-11-04 14:47:13 -08:00
phy phy: qcom-ufs: fix build error when the component is built as a module 2015-11-09 17:44:24 -05:00
pinctrl This is the bulk of GPIO changes for v4.4: 2015-11-02 12:59:12 -08:00
platform platform/chrome: Branch for v4.4 2015-11-13 21:53:18 -08:00
pnp
power - New Device Support 2015-11-06 10:23:50 -08:00
powercap
pps
ps3
ptp
pwm pwm: Changes for v4.4-rc1 2015-11-11 09:16:10 -08:00
rapidio
ras
regulator spi: Updates for v4.4 2015-11-05 13:15:12 -08:00
remoteproc
reset
rpmsg
rtc RTC for 4.4 2015-11-10 10:01:21 -08:00
s390 block: change ->make_request_fn() and users to return a queue cookie 2015-11-07 10:40:46 -07:00
sbus
scsi SCSI misc on 20151113 2015-11-13 20:35:54 -08:00
sfi
sh
sn
soc ARM: SoC driver updates for v4.4 2015-11-10 15:00:03 -08:00
spi Merge remote-tracking branches 'spi/topic/s3c64xx', 'spi/topic/ti-qspi' and 'spi/topic/txx9' into spi-next 2015-11-04 11:02:16 +00:00
spmi char/misc drivers for 4.4-rc1 2015-11-04 22:15:15 -08:00
ssb
staging Merge branch 'for-4.4/io-poll' of git://git.kernel.dk/linux-block 2015-11-10 17:23:49 -08:00
target SCSI misc on 20151113 2015-11-13 20:35:54 -08:00
tc
thermal thermal: rockchip: fix compile error 2015-11-11 19:52:39 -08:00
thunderbolt
tty asm-generic cleanups 2015-11-06 14:22:15 -08:00
uio
usb SCSI misc on 20151113 2015-11-13 20:35:54 -08:00
uwb driver core update for 4.4-rc1 2015-11-04 21:50:37 -08:00
vfio VFIO updates for v4.4-rc1 2015-11-13 17:05:32 -08:00
vhost Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2015-11-13 20:04:17 -08:00
video fbdev changes for 4.4 2015-11-10 10:00:09 -08:00
virt
virtio
vlynq
vme char/misc drivers for 4.4-rc1 2015-11-04 22:15:15 -08:00
w1 power supply and reset changes for the v4.4 series 2015-11-05 12:28:15 -08:00
watchdog Merge git://www.linux-watchdog.org/linux-watchdog 2015-11-10 10:11:12 -08:00
xen Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2015-11-13 20:04:17 -08:00
zorro
Kconfig char/misc drivers for 4.4-rc1 2015-11-04 22:15:15 -08:00
Makefile char/misc drivers for 4.4-rc1 2015-11-04 22:15:15 -08:00