[PATCH 1/4] drm/dsi: Make mipi_dsi_dcs_write() return ssize_t

[Thierry Reding]

On Tue, Jul 22, 2014 at 12:23:07PM +0200, Andrzej Hajda wrote:
> Hi Thierry,
> 
> YoungJun's comment refreshed my memory about mipi_dsi_dcs_write return
> value. It should be rather int than ssize_t. Why?
> .transfer() returns the number of read bytes or error, but in case
> of dcs write no bytes are read, so it in fact returns error or 0.
> This is why return value was implemented originally as int.
> So I do not think this patch is necessary.

I think it should return the number of bytes written or an error. That
way we give callers the maximum amount of information. They may still
choose to only handle < 0 for convenience, but at least the information
will be there should it become required at some point.

Thierry
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