dispc_ovl_calc_scaling_44xx() doesn't work correctly for writeback. There are
two issues with it:
- the function tries to calculate pixel clock for the input plane using
dispc_plane_pclk_rate(), calling this with writeback as input plane results in
a BUG(), this function shouldn't be called for writeback at all. Fix this by
calculating pixel clock only when we are not in mem to mem mode.
- the maximum input_width is the product of the downscale ratio supported and
the and the given output_width. This was calculated incorrectly by dividing
output_width with maxdownscale. Fix this.
Signed-off-by: Archit Taneja <archit@xxxxxx>
---
drivers/video/omap2/dss/dispc.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/video/omap2/dss/dispc.c b/drivers/video/omap2/dss/dispc.c
index 05def42..f19cd37 100644
--- a/drivers/video/omap2/dss/dispc.c
+++ b/drivers/video/omap2/dss/dispc.c
@@ -2264,14 +2264,16 @@ static int dispc_ovl_calc_scaling_44xx(enum omap_plane plane,
u16 in_height = DIV_ROUND_UP(height, *decim_y);
const int maxsinglelinewidth =
dss_feat_get_param_max(FEAT_PARAM_LINEWIDTH);
- unsigned long pclk = dispc_plane_pclk_rate(plane);
const int maxdownscale = dss_feat_get_param_max(FEAT_PARAM_DOWNSCALE);
- if (mem_to_mem)
- in_width_max = DIV_ROUND_UP(out_width, maxdownscale);
- else
+ if (mem_to_mem) {
+ in_width_max = out_width * maxdownscale;
+ } else {
+ unsigned long pclk = dispc_plane_pclk_rate(plane);
+
in_width_max = dispc_core_clk_rate() /
DIV_ROUND_UP(pclk, out_width);
+ }
*decim_x = DIV_ROUND_UP(width, in_width_max);
--
1.7.9.5
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