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8bc655521b
linux/drivers/video
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Archit Taneja 8bc655521b OMAPDSS: DISPC: Preload more data in pipeline DMAs for OMAP4+ SoCs 
DISPC pipeline DMAs preload some bytes of pixel data in the vertical blanking
region before the start of each frame. The preload ensures the pipeline doesn't
underflow when the active region of the display starts.

DISPC_GFX/VIDp_PRELOAD registers allow us to program how many bytes of data
should be preloaded for each pipeline. Calculating a precise preload value
would be a complex function of the pixel clock of the connected display, the
vertical blanking duration and the interconnect traffic at that instance. If
the register is left untouched, a default value is preloaded.

We observe underflows for OMAP4+ SoCs for certain bandwidth intensive use cases
with many other initiators active, and in situations where memory access isn't
very efficient(like accessing Tiler mapped buffers and EMIF configured in
non-interleaved more). The cause of the underflow is because the default preload
value isn't sufficient for the DMA to reach a steady state. We configure the
PRELOAD register such that the pipelines preload data up to the high threshold
of the FIFO.

Preloading lot of data for older SoCs can have a negative impact. Due to slower
interconnects, it's possible that the DISPC DMA cannot preload up to the high
threshold within the vertical blanking region of the panel. We leave the PRELOAD
registers to their reset values since we haven't faced underflows with these
SoCs because of low value of PRELOAD.

Signed-off-by: Archit Taneja <archit@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
2014-01-13 12:19:56 +02:00
..
aty framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
backlight pwm: Changes for v3.13-rc1 2013-11-16 12:21:40 -08:00
console parisc: sticon - unbreak on 64bit kernel 2013-11-07 22:46:20 +01:00
exynos ARM: SoC fixes for 3.13 merge window 2013-11-16 12:45:55 -08:00
geode framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
i810 video: i810fb: remove unnecessary pci_set_drvdata() 2013-09-19 13:30:07 +03:00
intelfb video: intelfb: remove unnecessary pci_set_drvdata() 2013-09-19 13:30:07 +03:00
kyro video: kyro: fix incorrect sizes when copying to userspace 2013-11-26 16:40:14 +02:00
logo Bye, bye, WfW flag 2013-09-11 19:55:12 -07:00
matrox video: Remove unnecessary semicolons 2013-10-30 13:34:52 +02:00
mb862xx video: mb862xx: Remove redundant dev_set_drvdata 2013-09-26 13:49:09 +03:00
mbx framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
mmp fbdev changes for 3.13 2013-11-14 14:44:20 +09:00
msm ARM: msm: Move mach/board.h contents to common.h 2013-08-06 11:18:02 -07:00
nvidia video: Remove unnecessary semicolons 2013-10-30 13:34:52 +02:00
omap video: omapfb: use dev_get_platdata() 2013-09-20 12:22:01 +03:00
omap2 OMAPDSS: DISPC: Preload more data in pipeline DMAs for OMAP4+ SoCs 2014-01-13 12:19:56 +02:00
riva video: riva: Remove incorrect checks 2013-09-26 11:52:31 +03:00
savage video: savagefb: remove unnecessary pci_set_drvdata() 2013-09-19 13:30:09 +03:00
sis fbdev changes for 3.13 2013-11-14 14:44:20 +09:00
vermilion fbdev/vermillion: use vm_iomap_memory() 2013-04-24 08:41:42 +03:00
via viafb: rename display_timing to via_display_timing 2013-01-24 08:59:44 +01:00
68328fb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
acornfb.c drivers/video/acornfb.c: use __free_reserved_page() to simplify the code 2013-11-13 12:09:03 +09:00
acornfb.h drivers/video/acornfb.c: remove dead code 2013-09-11 15:56:22 -07:00
amba-clcd.c fbdev changes for 3.13 2013-11-14 14:44:20 +09:00
amifb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
arcfb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
arkfb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
asiliantfb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
atafb_iplan2p2.c
atafb_iplan2p4.c
atafb_iplan2p8.c
atafb_mfb.c
atafb_utils.h
atafb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
atafb.h
atmel_lcdfb.c atmel_lcdfb: fix module autoload 2013-12-04 10:48:12 +02:00
au1100fb.c fbdev changes for 3.13 2013-11-14 14:44:20 +09:00
au1100fb.h
au1200fb.c fbdev changes for 3.13 2013-11-14 14:44:20 +09:00
au1200fb.h
auo_k190x.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2013-04-30 09:36:50 -07:00
auo_k190x.h
auo_k1900fb.c AUO-K190x: add runtime-pm calls to controller init functions 2013-04-04 13:08:06 +03:00
auo_k1901fb.c AUO-K190x: add runtime-pm calls to controller init functions 2013-04-04 13:08:06 +03:00
bf54x-lq043fb.c Video / bf54x-lq043fb: Use module_platform_driver() to simplify code 2013-09-30 10:51:09 +03:00
bf537-lq035.c Drivers: video: remove __dev* attributes. 2013-01-03 15:57:01 -08:00
bfin_adv7393fb.c procfs: new helper - PDE_DATA(inode) 2013-04-09 14:13:32 -04:00
bfin_adv7393fb.h
bfin-lq035q1-fb.c fbdev: bfin-lq035q1-fb: Use dev_pm_ops 2013-06-26 16:16:26 +03:00
bfin-t350mcqb-fb.c Video / bfin-t350mcqb-fb: Use module_platform_driver() to simplify code 2013-09-30 10:51:08 +03:00
broadsheetfb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
bt431.h
bt455.h
bw2.c video: bw2: Remove redundant dev_set_drvdata 2013-09-26 13:49:22 +03:00
c2p_core.h
c2p_iplan2.c
c2p_planar.c
c2p.h
carminefb_regs.h
carminefb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
carminefb.h
cfbcopyarea.c
cfbfillrect.c
cfbimgblt.c video: Remove unnecessary semicolons 2013-10-30 13:34:52 +02:00
cg3.c video: cg3: Remove redundant dev_set_drvdata 2013-09-26 13:49:23 +03:00
cg6.c video: Remove unnecessary semicolons 2013-10-30 13:34:52 +02:00
cg14.c video: Remove unnecessary semicolons 2013-10-30 13:34:52 +02:00
chipsfb.c Drivers: video: remove __dev* attributes. 2013-01-03 15:57:01 -08:00
cirrusfb.c video: cirrusfb: Remove incorrect checks 2013-09-26 11:52:31 +03:00
clps711xfb.c ARM defconfigs: add missing inclusions of linux/platform_device.h 2013-02-14 15:14:32 -08:00
cobalt_lcdfb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
controlfb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
controlfb.h
cyber2000fb.c fbdev changes for 3.13 2013-11-14 14:44:20 +09:00
cyber2000fb.h
da8xx-fb.c video: da8xx-fb: remove unwanted define 2013-10-30 13:36:48 +02:00
display_timing.c video: add display_timing and videomode 2013-01-24 09:03:04 +01:00
dnfb.c Drivers: video: remove __dev* attributes. 2013-01-03 15:57:01 -08:00
edid.h
efifb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
ep93xx-fb.c video: ep93xx-fb: use dev_get_platdata() 2013-09-20 12:22:02 +03:00
fb_ddc.c
fb_defio.c new helper: file_inode(file) 2013-02-22 23:31:31 -05:00
fb_draw.h
fb_notify.c
fb_sys_fops.c
fb-puv3.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
fbcmap.c drivers: video: fbcmap: remove the redundency and incorrect checkings 2013-08-30 11:41:24 +03:00
fbcvt.c
fbmem.c fb: reorder the lock sequence to fix potential dead lock 2013-11-11 15:52:59 +02:00
fbmon.c Merge branch '3.10/fb-mmap' into for-next 2013-04-26 09:14:47 +03:00
fbsysfs.c fb: reorder the lock sequence to fix potential dead lock 2013-11-11 15:52:59 +02:00
ffb.c video: ffb: Remove redundant dev_set_drvdata 2013-09-26 13:49:24 +03:00
fm2fb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
fsl-diu-fb.c fbdev changes for 3.13 2013-11-14 14:44:20 +09:00
g364fb.c
gbefb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
goldfishfb.c treewide: Fix typos in printk 2013-03-20 16:26:32 +01:00
grvga.c video: grvga: Remove redundant dev_set_drvdata 2013-09-26 13:49:07 +03:00
gxt4500.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
hdmi.c video/hdmi: Rename HDMI_IDENTIFIER to HDMI_IEEE_OUI 2013-08-30 08:42:01 +10:00
hecubafb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
hgafb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
hitfb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
hpfb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
hyperv_fb.c hyperv-fb: add blanking support 2013-10-09 12:52:50 +03:00
i740_reg.h
i740fb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
igafb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
imsttfb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
imxfb.c video: imxfb: use dev_get_platdata() 2013-09-20 12:22:03 +03:00
jz4740_fb.c Video / jz4740_fb: Use module_platform_driver() to simplify code 2013-09-30 10:51:09 +03:00
Kconfig Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2013-11-15 14:19:54 +09:00
leo.c video: Remove unnecessary semicolons 2013-10-30 13:34:52 +02:00
macfb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
macmodes.c
macmodes.h
Makefile lib: Move fonts from drivers/video/console/ to lib/fonts/ 2013-06-28 10:28:22 +02:00
maxinefb.c
metronomefb.c fbdev: fix error return code in metronomefb_probe() 2013-10-29 12:20:11 +02:00
modedb.c
mx3fb.c video: mx3fb: use dev_get_platdata() 2013-09-20 12:22:01 +03:00
mxsfb.c video: mxsfb: Add missing break 2013-09-26 15:33:23 +03:00
n411.c
neofb.c fbdev changes for 3.13 2013-11-14 14:44:20 +09:00
nuc900fb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
nuc900fb.h
of_display_timing.c video: of: display_timing: correct display-timings node finding 2013-09-26 12:31:42 +03:00
of_videomode.c videomode: videomode_from_timing work 2013-03-21 14:34:33 +02:00
offb.c offb: Add palette hack for little endian 2013-12-10 11:25:07 +11:00
output.c video: output: convert class code to use dev_groups 2013-07-26 10:37:02 +03:00
p9100.c video: p9100: Remove redundant dev_set_drvdata 2013-09-26 13:49:25 +03:00
platinumfb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
platinumfb.h
pm2fb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
pm3fb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
pmag-aa-fb.c
pmag-ba-fb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
pmagb-b-fb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
ps3fb.c fbdev/ps3fb: Fix section mismatch warning for ps3fb_probe 2013-09-11 11:39:39 +10:00
pvr2fb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
pxa3xx-gcu.c Various fbdev changes for 3.11 2013-07-09 15:51:32 -07:00
pxa3xx-gcu.h
pxa168fb.c video: pxa168fb: use dev_get_platdata() 2013-09-20 12:22:01 +03:00
pxa168fb.h
pxafb.c video: pxafb: use dev_get_platdata() 2013-09-20 12:22:02 +03:00
pxafb.h
q40fb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
s1d13xxxfb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
s3c-fb.c video: s3c-fb: use dev_get_platdata() 2013-09-20 12:23:21 +03:00
s3c2410fb.c video: s3c2410: use dev_get_platdata() 2013-09-20 12:22:02 +03:00
s3c2410fb.h
s3fb.c fbdev changes for 3.13 2013-11-14 14:44:20 +09:00
sa1100fb.c video: sa1100fb: use dev_get_platdata() 2013-09-20 12:22:02 +03:00
sa1100fb.h
sbuslib.c video: Remove unnecessary semicolons 2013-10-30 13:34:52 +02:00
sbuslib.h
sgivwfb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
sh_mipi_dsi.c video: remove unnecessary platform_set_drvdata() 2013-06-26 14:44:40 +03:00
sh_mobile_hdmi.c fbdev: shmobile-hdmi: Convert to clk_prepare/unprepare 2013-11-11 15:32:58 +02:00
sh_mobile_lcdcfb.c fb: reorder the lock sequence to fix potential dead lock 2013-11-11 15:52:59 +02:00
sh_mobile_lcdcfb.h fbdev: sh_mobile_lcdc: Store the backlight brightness internally 2012-11-21 15:50:01 +01:00
sh_mobile_meram.c fbdev: sh_mobile_meram: Fix defined but not used compiler warnings 2013-11-26 16:59:42 +02:00
sh7760fb.c video: sh7760fb: fix to pass correct device identity to free_irq() 2013-07-29 11:25:03 +03:00
simplefb.c simplefb: use write-combined remapping 2013-10-30 12:49:02 +02:00
skeletonfb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
sm501fb.c Drivers: video: remove __dev* attributes. 2013-01-03 15:57:01 -08:00
smscufx.c video: smscufx: Use NULL instead of 0 2013-09-26 11:50:08 +03:00
ssd1307fb.c video: ssd1307fb: Remove redundant of_match_ptr 2013-10-09 12:35:44 +03:00
sstfb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
sticore.h parisc: sticon - unbreak on 64bit kernel 2013-11-07 22:46:20 +01:00
stifb.c fbdev changes for 3.13 2013-11-14 14:44:20 +09:00
sunxvr500.c Drivers: video: remove __dev* attributes. 2013-01-03 15:57:01 -08:00
sunxvr1000.c video: sunxvr1000: Remove redundant dev_set_drvdata 2013-09-26 13:49:26 +03:00
sunxvr2500.c Drivers: video: remove __dev* attributes. 2013-01-03 15:57:01 -08:00
svgalib.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
syscopyarea.c
sysfillrect.c
sysimgblt.c video: Remove unnecessary semicolons 2013-10-30 13:34:52 +02:00
tcx.c video: Remove unnecessary semicolons 2013-10-30 13:34:52 +02:00
tdfxfb.c video: tdfxfb: remove unnecessary pci_set_drvdata() 2013-09-19 13:30:10 +03:00
tgafb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
tmiofb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
tridentfb.c video: tridentfb: remove unnecessary pci_set_drvdata() 2013-09-19 13:30:10 +03:00
udlfb.c video: udlfb: Use NULL instead of 0 2013-09-26 11:50:07 +03:00
uvesafb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
valkyriefb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
valkyriefb.h
vesafb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
vfb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
vga16fb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
vgastate.c
videomode.c videomode: videomode_from_timing work 2013-03-21 14:34:33 +02:00
vt8500lcdfb.c video: vt8500: fix error handling in probe() 2013-12-04 10:50:16 +02:00
vt8500lcdfb.h
vt8623fb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
w100fb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
w100fb.h
wm8505fb_regs.h
wm8505fb.c framebuffer: Use fb_<level> 2013-10-29 12:53:07 +02:00
wmt_ge_rops.c video: wmt_ge_rops: Fix a trivial typo 2013-10-09 12:35:46 +03:00
wmt_ge_rops.h video: vt8500: Make wmt_ge_rops optional 2013-04-04 13:07:33 +03:00
xen-fbfront.c Drivers: video: remove __dev* attributes. 2013-01-03 15:57:01 -08:00
xilinxfb.c video: xilinxfb: Fix for "Use standard variable name convention" 2013-10-29 10:49:40 +02:00