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author | Chandrabhanu Mahapatra <cmahapatra@ti.com> | 2011-12-19 14:03:44 +0530 |
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committer | Tomi Valkeinen <tomi.valkeinen@ti.com> | 2012-01-02 08:51:29 +0200 |
commit | debd90749b7440ad5fc02e4f0d1e8a696385f196 (patch) | |
tree | fdde45a42f4bba25a323c246d213d8bebfdfa9cf /drivers/video/omap2/dss/Makefile | |
parent | 1f3f53ae5179ba7f24b4a429bc41773f1f4857ca (diff) | |
download | op-kernel-dev-debd90749b7440ad5fc02e4f0d1e8a696385f196.zip op-kernel-dev-debd90749b7440ad5fc02e4f0d1e8a696385f196.tar.gz |
OMAPDSS: DISPC: Update Fir Coefficients
The FIR coefficients present in kernel are being updated to new coefficients
consisting of 24 coefficient tables, with 12 each for 3 tap and 5 tap scenario,
which are chosen on the basis of DISPC up/downsampling filters M value. M is
the inverse of low pass cut off frequency of the sampling filter. For vertical
scaling 3 tap or 5 tap tables are used based on the clock rate and width of
the line buffer whereas in OMAP2 3 tap is always used. For horizontal scaling
however 5 tap tables are always used.
New coefficients and the corresponding logic have been tested on OMAP2, OMAP3
and OMAP4. Horizontal and vertical scaling worked fine except for some 3 tap
vs 5 tap issue during vertical upscaling and clock failing issues which is
acknowledged in the next patch. Vertical upscaling was found to perform better
under 5 taps. The 24 coefficient tables have been moved to another file
dispc_coefs.c for proper maintainance.
This code is written based on code written by Lajos Molnar <lajos@ti.com> in
Android Kernel for scaling. Lajos Molnar <lajos@ti.com> had fine tuned the FIR
coefficient selection process and reduced outliness and blockiness around
images when upscaling more than 2 times.
Signed-off-by: Chandrabhanu Mahapatra <cmahapatra@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Diffstat (limited to 'drivers/video/omap2/dss/Makefile')
-rw-r--r-- | drivers/video/omap2/dss/Makefile | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/video/omap2/dss/Makefile b/drivers/video/omap2/dss/Makefile index 8594522..5c450b0 100644 --- a/drivers/video/omap2/dss/Makefile +++ b/drivers/video/omap2/dss/Makefile @@ -1,6 +1,6 @@ obj-$(CONFIG_OMAP2_DSS) += omapdss.o -omapdss-y := core.o dss.o dss_features.o dispc.o display.o manager.o overlay.o \ - apply.o +omapdss-y := core.o dss.o dss_features.o dispc.o dispc_coefs.o display.o \ + manager.o overlay.o apply.o omapdss-$(CONFIG_OMAP2_DSS_DPI) += dpi.o omapdss-$(CONFIG_OMAP2_DSS_RFBI) += rfbi.o omapdss-$(CONFIG_OMAP2_DSS_VENC) += venc.o |