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authorChandrabhanu Mahapatra <cmahapatra@ti.com>2011-12-19 14:03:44 +0530
committerTomi Valkeinen <tomi.valkeinen@ti.com>2012-01-02 08:51:29 +0200
commitdebd90749b7440ad5fc02e4f0d1e8a696385f196 (patch)
treefdde45a42f4bba25a323c246d213d8bebfdfa9cf /drivers/video/omap2/dss/Makefile
parent1f3f53ae5179ba7f24b4a429bc41773f1f4857ca (diff)
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/Makefile4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/video/omap2/dss/Makefile b/drivers/video/omap2/dss/Makefile
index 8594522184d..5c450b0f94d 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