From ab6b2582b8f931f8f324fbf7bcb8338b8fc1eded Mon Sep 17 00:00:00 2001
From: Tomi Valkeinen <tomi.valkeinen@ti.com>
Date: Tue, 17 Mar 2015 15:31:10 +0200
Subject: [PATCH] OMAPDSS: DISPC: add check for scaling limits

On OMAP3/AM43xx some scaling factors cause underflows/synclosts. After
studying this, I found that sometimes the driver uses three-tap scaling
with downscaling factor smaller than x0.5. This causes issues, as x0.5
is the limit for three-tap scaling.

The driver has FEAT_PARAM_DOWNSCALE parameter, but that seems to be for
five-tap scaling, which allows scaling down to x0.25.

This patch adds checks for both horizontal and vertical scaling. For
horizontal the HW always uses 5 taps, so the limit is x0.25.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
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