drm/bridge: tc358768: Attempt to fix DSI horizontal timings

The DSI horizontal timing calculations done by the driver seem to often
lead to underflows or overflows, depending on the videomode.

There are two main things the current driver doesn't seem to get right:
DSI HSW and HFP, and VSDly. However, even following Toshiba's
documentation it seems we don't always get a working display.

This patch attems to fix the horizontal timings for DSI event mode, and
on a system with a DSI->HDMI encoder, a lot of standard HDMI modes now
seem to work. The work relies on Toshiba's documentation, but also quite
a bit on empirical testing.

Also add quite a bit timing related debug prints to make it easier to
improve on this later.

I am not able to test pulse mode, and this patch doesn't attempt to fix
it. However, the VSDly calculation also affects pulse mode, so this
might cause a regression.

Upstream-Status: Pending
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>

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