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500a3d2eb3
linux/drivers/gpu/drm
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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
..
amd Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2015-11-10 09:33:06 -08:00
armada drm/armada: Convert the probe function to the generic drm_of_component_probe() 2015-10-20 12:01:34 +02:00
ast drm/ast: Initialized data needed to map fbdev memory 2015-11-11 12:27:31 +10:00
atmel-hlcdc drm: Stop using drm_vblank_count() as the hw frame counter 2015-10-07 16:13:52 +02:00
bochs
bridge drm/panel: Changes for v4.4-rc1 2015-11-05 11:07:13 +10:00
cirrus
exynos drm/exynos/gem: remove DMA-mapping hacks used for constructing page array 2015-11-03 11:46:39 +09:00
fsl-dcu drm: Stop using drm_vblank_count() as the hw frame counter 2015-10-07 16:13:52 +02:00
gma500 drm/irq: Use unsigned int pipe in public API 2015-10-06 12:57:47 +02:00
i2c Merge branch 'drm-tda998x-devel' of git://ftp.arm.linux.org.uk/~rmk/linux-arm into drm-next 2015-10-15 14:17:13 +10:00
i810
i915 drm/i915: Fix GT frequency rounding 2015-11-16 15:25:34 +02:00
imx imx-drm fixes and color format updates 2015-11-05 11:06:56 +10:00
mga drm/irq: Use unsigned int pipe in public API 2015-10-06 12:57:47 +02:00
mgag200 drm/mgag200: Fix driver_load error handling 2015-09-24 08:10:44 +10:00
msm drm/msm: Remove local fbdev emulation Kconfig option 2015-10-22 15:46:36 -04:00
nouveau Merge branch 'akpm' (patches from Andrew) 2015-11-10 21:14:23 -08:00
omapdrm drm: Check crtc viewport correctly with rotated primary plane on atomic drivers 2015-10-19 11:00:47 +02:00
panel spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
qxl Merge tag 'topic/drm-misc-2015-10-19' of git://anongit.freedesktop.org/drm-intel into drm-next 2015-10-20 09:01:49 +10:00
r128 drm/irq: Use unsigned int pipe in public API 2015-10-06 12:57:47 +02:00
radeon Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2015-11-10 09:33:06 -08:00
rcar-du drm: rcar-du: Add support for the R8A7794 DU 2015-10-21 18:52:38 +03:00
rockchip Revert "drm/rockchip: Convert the probe function to the generic drm_of_component_probe()" 2015-11-13 09:59:46 +10:00
savage
shmobile drm: Stop using drm_vblank_count() as the hw frame counter 2015-10-07 16:13:52 +02:00
sis include/uapi/drm/sis_drm.h: move sis_file_private to drivers/gpu/drm/sis/sis_drv.h 2015-10-16 11:27:46 +10:00
sti drm/sti: load HQVDP firmware the first time HQVDP's plane is used 2015-11-03 13:04:56 +01:00
tdfx
tegra Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2015-11-10 09:33:06 -08:00
tilcdc drm: Stop using drm_vblank_count() as the hw frame counter 2015-10-07 16:13:52 +02:00
ttm drm/ttm: Fix memory space allocation v2 2015-09-15 00:57:01 -07:00
udl
vc4 drm/vc4: Add dependency on HAVE_DMA_ATTRS, and select DRM_GEM_CMA_HELPER 2015-11-10 08:25:27 +10:00
vgem drm/vgem: Drop vgem_drm_gem_mmap 2015-10-19 11:00:44 +02:00
via via_drm.h: move struct via_file_private definition to drivers/gpu/drm/via/via_drv.h 2015-10-16 11:27:49 +10:00
virtio Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2015-11-10 09:33:06 -08:00
vmwgfx Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2015-11-10 09:33:06 -08:00
ati_pcigart.c
drm_agpsupport.c drm: Remove __OS_HAS_AGP 2015-09-30 10:44:48 +02:00
drm_atomic_helper.c drm: Swap w/h when converting the mode to src coordidates for a rotated primary plane 2015-10-19 11:00:46 +02:00
drm_atomic.c drm: drm_atomic_crtc_get_property should be static 2015-09-24 20:14:26 +02:00
drm_auth.c
drm_bridge.c
drm_bufs.c drm: Remove __OS_HAS_AGP 2015-09-30 10:44:48 +02:00
drm_cache.c
drm_context.c
drm_crtc_helper.c
drm_crtc_internal.h
drm_crtc.c Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2015-11-10 09:33:06 -08:00
drm_debugfs.c
drm_dma.c
drm_dp_helper.c Linux 4.3-rc2 2015-09-24 17:18:41 +02:00
drm_dp_mst_topology.c drm: fix mutex leak in drm_dp_get_mst_branch_device 2015-10-22 08:29:08 +10:00
drm_drv.c drm: misc cleanup 2015-10-16 15:50:57 +02:00
drm_edid_load.c drm: Constify generic_edid_names[] 2015-09-08 13:45:52 +02:00
drm_edid.c drm/edid: Round to closest when computing the CEA/HDMI alternate clock 2015-10-20 12:01:29 +02:00
drm_encoder_slave.c
drm_fb_cma_helper.c
drm_fb_helper.c Merge tag 'topic/drm-misc-2015-10-19' of git://anongit.freedesktop.org/drm-intel into drm-next 2015-10-20 09:01:49 +10:00
drm_flip_work.c
drm_fops.c
drm_gem_cma_helper.c Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2015-11-10 09:33:06 -08:00
drm_gem.c Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2015-11-10 09:33:06 -08:00
drm_global.c
drm_hashtab.c
drm_info.c
drm_internal.h drm: move drm_class into drm_sysfs.c 2015-09-09 15:05:17 +02:00
drm_ioc32.c drm: Remove __OS_HAS_AGP 2015-09-30 10:44:48 +02:00
drm_ioctl.c drm: Enforce unlocked ioctl operation for kms driver ioctls 2015-10-16 15:50:54 +02:00
drm_irq.c drm: Don't oops in drm_calc_timestamping_constants() if drm_vblank_init() wasn't called 2015-11-13 09:55:00 +10:00
drm_legacy.h
drm_lock.c signals: kill block_all_signals() and unblock_all_signals() 2015-11-06 17:50:42 -08:00
drm_memory.c drm: Remove __OS_HAS_AGP 2015-09-30 10:44:48 +02:00
drm_mipi_dsi.c
drm_mm.c drm/mm: Do DRM_MM_CREATE_TOP adj_start calculation after color_adjust 2015-09-08 13:45:47 +02:00
drm_modes.c
drm_modeset_lock.c drm/atomic: Make sure lock is held in trylock contexts. 2015-09-08 13:45:53 +02:00
drm_of.c drm: Introduce generic probe function for component based masters. 2015-10-20 12:01:29 +02:00
drm_panel.c
drm_pci.c drm/doc: Update docs about device instance setup 2015-09-30 10:06:06 +02:00
drm_plane_helper.c drm/atomic: Make prepare_fb/cleanup_fb only take state, v3. 2015-09-08 13:45:54 +02:00
drm_platform.c drm/doc: Update docs about device instance setup 2015-09-30 10:06:06 +02:00
drm_prime.c
drm_probe_helper.c drm: Add a non-locking version of drm_kms_helper_poll_enable(), v2 2015-09-30 16:04:08 +03:00
drm_rect.c drm: Use DRM_ROTATE_MASK and DRM_REFLECT_MASK 2015-10-05 15:32:51 +02:00
drm_scatter.c
drm_sysfs.c Merge commit '06d1ee32a4d25356a710b49d5e95dbdd68bdf505' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux into drm-next 2015-10-16 10:25:28 +10:00
drm_trace_points.c
drm_trace.h
drm_vm.c drm: Remove __OS_HAS_AGP 2015-09-30 10:44:48 +02:00
drm_vma_manager.c drm/gem: Use kref_get_unless_zero for the weak mmap references 2015-10-19 11:00:44 +02:00
Kconfig drm/vc4: Add KMS support for Raspberry Pi. 2015-10-21 10:33:12 +01:00
Makefile Merge tag 'drm-vc4-next-2015-10-21' of http://github.com/anholt/linux into drm-next 2015-10-22 10:31:17 +10:00