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OMAP: DSS2: Make partial update width even

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There are some strange problems with DSI and updates with odd widths. One
particular problem is that HS TX timeout triggers easily with updates with
odd widths.

This patch makes the updates widths even, circumventing the problem. There
should be no ill side effects with increasing the update area slightly to
make the width even.

Signed-off-by: Ville Syrjälä <ville.syrjala@nokia.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>
This commit is contained in:
Tomi Valkeinen 2010-03-26 16:26:37 +02:00
parent 279fcd48c4
commit f49a951f8a
1 changed files with 20 additions and 0 deletions
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20
drivers/video/omap2/dss/manager.c
View file

@ -940,6 +940,22 @@ static int configure_dispc(void)
return r;
}
/* Make the coordinates even. There are some strange problems with OMAP and
* partial DSI update when the update widths are odd. */
static void make_even(u16 *x, u16 *w)
{
u16 x1, x2;
x1 = *x;
x2 = *x + *w;
x1 &= ~1;
x2 = ALIGN(x2, 2);
*x = x1;
*w = x2 - x1;
}
/* Configure dispc for partial update. Return possibly modified update
* area */
void dss_setup_partial_planes(struct omap_dss_device *dssdev,
@ -968,6 +984,8 @@ void dss_setup_partial_planes(struct omap_dss_device *dssdev,
return;
}
make_even(&x, &w);
spin_lock_irqsave(&dss_cache.lock, flags);
/* We need to show the whole overlay if it is scaled. So look for
@ -1029,6 +1047,8 @@ void dss_setup_partial_planes(struct omap_dss_device *dssdev,
w = x2 - x1;
h = y2 - y1;
make_even(&x, &w);
DSSDBG("changing upd area due to ovl(%d) scaling %d,%d %dx%d\n",
i, x, y, w, h);
}