linux-kernel - Re: [PATCH v3 0/3] drm: atmel-hlcdc: clut support

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Date:   Mon, 19 Jun 2017 22:09:29 +0200
From:   Boris Brezillon <boris.brezillon@...e-electrons.com>
To:     Peter Rosin <peda@...ntia.se>
Cc:     linux-kernel@...r.kernel.org, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Sean Paul <seanpaul@...omium.org>,
        dri-devel@...ts.freedesktop.org,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Subject: Re: [PATCH v3 0/3] drm: atmel-hlcdc: clut support

Le Mon, 19 Jun 2017 09:44:23 +0200,
Peter Rosin <peda@...ntia.se> a écrit :

> Hi!
> 
> This series adds support for an 8-bit clut mode in the atmel-hlcdc
> driver.
> 
> I have now tested patch 1 with the below program (modeset.c
> adapted from https://github.com/dvdhrm/docs/tree/master/drm-howto
> to use an 8-bit mode).

I'm glad you finally find a way to test it. Patch 1 looks good to me,
except I would have added the missing .set_property in a separate patch
(placed at the beginning of the series).

> 
> Since v2 I have also cleared up why the first 16 entries of the clut
> was not working right. It was of course my own damn fault, and the
> fix was in atmel_hlcdc_layer_write_clut function which called the
> ...write_reg function which in turn added an extra offset of 16
> registers...
> 
> Changes since v2:
> 
> - Fix mapping to the clut registers.
> 
> Changes since v1:
> 
> - Move the clut update from atmel_hlcdc_crtc_mode_valid to
>   atmel_hlcdc_plane_atomic_update.
> - Add default .gamma_set helper (drm_atomic_helper_legacy_gamma_set).
> - Don't keep a spare copy of the clut, reuse gamma_store instead.
> - Don't try to synchronize the legacy fb clut with the drm clut.
> 
> As I said in v2, I have not added any .clut_offset to the overlay2
> layer of sama5d4, since the chip does not appear to have that layer.
> I didn't do that to make it easier to work with the patch previously
> sent to remove that layer, but I suspect bad things may happen to
> sama5d4 users if they do not have that layer removed.
> 
> Cheers,
> peda
>