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| author | Chandrabhanu Mahapatra <cmahapatra@ti.com> | 2011-12-19 14:03:56 +0530 |
|---|---|---|
| committer | Tomi Valkeinen <tomi.valkeinen@ti.com> | 2012-01-02 08:51:29 +0200 |
| commit | 7282f1b7c9b5210114ce1ebb0ea5fe8a63fd5778 (patch) | |
| tree | bb5dc70dcd6789d22953c45742662edb0422b01f /drivers/video/omap2/dss/dss_features.c | |
| parent | debd90749b7440ad5fc02e4f0d1e8a696385f196 (diff) | |
| download | op-kernel-dev-7282f1b7c9b5210114ce1ebb0ea5fe8a63fd5778.zip op-kernel-dev-7282f1b7c9b5210114ce1ebb0ea5fe8a63fd5778.tar.gz | |
OMAPDSS: DISPC: Update Scaling Clock Logic
Clock requirements for scaling in OMAP2, OMAP3 and OMAP4 are different. In
OMAP2 and OMAP3 the required clock rate is a function of pixel clock, vertical
downscale ratio and horizontal downscale ratio whereas in OMAP4 it is a
function of pixel clock and horizontal downscale ratio only. Selection of 3-tap
vs 5-tap coefficients depends on clock rate line buffer width in OMAP3 whereas
in OMAP4 it is independent of clock rate and line buffer width. In OMAP2 3-tap
for vertical and 5-tap for horizontal scaling is used. In OMAP4 5-tap is used
both for horizontal and vertical scaling for better performance. Also, the
number and width of line buffers differs in OMAP3 and OMAP4.
So, clock functions have been fined tuned for OMAP3 and support has been added
added for OMAP4. This code has been tested on OMAP2, OMAP3 and OMAP4, and
scaling issues due to clock errors have been resolved.
Signed-off-by: Chandrabhanu Mahapatra <cmahapatra@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Diffstat (limited to 'drivers/video/omap2/dss/dss_features.c')
| -rw-r--r-- | drivers/video/omap2/dss/dss_features.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/video/omap2/dss/dss_features.c b/drivers/video/omap2/dss/dss_features.c index b402699..5e4b829 100644 --- a/drivers/video/omap2/dss/dss_features.c +++ b/drivers/video/omap2/dss/dss_features.c @@ -304,6 +304,11 @@ static const struct dss_param_range omap2_dss_param_range[] = { [FEAT_PARAM_DSIPLL_FINT] = { 0, 0 }, [FEAT_PARAM_DSIPLL_LPDIV] = { 0, 0 }, [FEAT_PARAM_DOWNSCALE] = { 1, 2 }, + /* + * Assuming the line width buffer to be 768 pixels as OMAP2 DISPC + * scaler cannot scale a image with width more than 768. + */ + [FEAT_PARAM_LINEWIDTH] = { 1, 768 }, }; static const struct dss_param_range omap3_dss_param_range[] = { @@ -316,6 +321,7 @@ static const struct dss_param_range omap3_dss_param_range[] = { [FEAT_PARAM_DSIPLL_FINT] = { 750000, 2100000 }, [FEAT_PARAM_DSIPLL_LPDIV] = { 1, (1 << 13) - 1}, [FEAT_PARAM_DOWNSCALE] = { 1, 4 }, + [FEAT_PARAM_LINEWIDTH] = { 1, 1024 }, }; static const struct dss_param_range omap4_dss_param_range[] = { @@ -328,6 +334,7 @@ static const struct dss_param_range omap4_dss_param_range[] = { [FEAT_PARAM_DSIPLL_FINT] = { 500000, 2500000 }, [FEAT_PARAM_DSIPLL_LPDIV] = { 0, (1 << 13) - 1 }, [FEAT_PARAM_DOWNSCALE] = { 1, 4 }, + [FEAT_PARAM_LINEWIDTH] = { 1, 2048 }, }; /* OMAP2 DSS Features */ |
