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OMAPDSS: DISPC: fix div by zero issue in overlay scaling

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omapdrm doesn't always configure the overlays correctly, causing the
overlay setup functions to be called with zero timings. This leads to
division by zero error.

This happens, for example, when a HDMI cable is not connected, but a
user tries to setup a plane with scaling.

Fixing omapdrm is a big job, so for now let's check for the bad timings
in DISPC and return an error.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Tomi Valkeinen 2014-10-03 15:14:09 +00:00
parent 386f167c69
commit 4e1d3ca083
1 changed files with 5 additions and 0 deletions
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5
drivers/video/fbdev/omap2/dss/dispc.c
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@ -2322,6 +2322,11 @@ static int dispc_ovl_calc_scaling(unsigned long pclk, unsigned long lclk,
if (width == out_width && height == out_height)
return 0;
if (pclk == 0 || mgr_timings->pixelclock == 0) {
DSSERR("cannot calculate scaling settings: pclk is zero\n");
return -EINVAL;
}
if ((caps & OMAP_DSS_OVL_CAP_SCALE) == 0)
return -EINVAL;