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From: Daniel Stone <daniel@fooishbar.org>
To: Linus Walleij <linus.walleij@linaro.org>
Cc: "Alexandre Belloni" <alexandre.belloni@bootlin.com>,
	"Neil Armstrong" <narmstrong@baylibre.com>,
	"Maxime Ripard" <maxime.ripard@bootlin.com>,
	"Guido Günther" <agx@sigxcpu.org>,
	"open list:DRM PANEL DRIVERS" <dri-devel@lists.freedesktop.org>,
	"Nicolas Ferre" <nicolas.ferre@microchip.com>,
	"Paul Cercueil" <paul@crapouillou.net>,
	"Thierry Reding" <thierry.reding@gmail.com>,
	"Laurent Pinchart" <laurent.pinchart@ideasonboard.com>,
	"Sam Ravnborg" <sam@ravnborg.org>,
	"Stefan Mavrodiev" <stefan@olimex.com>,
	"Vincent Abriou" <vincent.abriou@st.com>,
	"Ludovic Desroches" <ludovic.desroches@microchip.com>,
	"Tomi Valkeinen" <tomi.valkeinen@ti.com>,
	"Jagan Teki" <jagan@amarulasolutions.com>,
	"Robert Chiras" <robert.chiras@nxp.com>,
	"Jonas Karlman" <jonas@kwiboo.se>, "Jyri Sarha" <jsarha@ti.com>,
	"Sean Paul" <sean@poorly.run>,
	"Jernej Skrabec" <jernej.skrabec@siol.net>,
	"Purism Kernel Team" <kernel@puri.s>
Subject: Re: DRM_MODE_CONNECTOR_PANEL? [Was: drm/panel: Add and fill drm_panel type field]
Date: Fri, 27 Sep 2019 13:44:13 +0100	[thread overview]
Message-ID: <CAPj87rN3Dh1ANz=rZD=EMOfRXce7cc7v3M6TR2P0VJhyrT4-yw@mail.gmail.com> (raw)
In-Reply-To: <CACRpkdYk8S271X7pV_Vxe7BhL_mScV69Xbet2xyOqF0fFsRdcg@mail.gmail.com>

Hi Linus,

On Fri, 27 Sep 2019 at 13:37, Linus Walleij <linus.walleij@linaro.org> wrote:
> Also the ILI9322 can actually set up gamma correction which is
> very nice for professional applications. I haven't seen any way for
> DRM to do gamma correction properly or any framework for it
> to adjust and propagate gamma to/from userspace (seems like
> another enormous task), but I am pretty sure it will be there one
> of these days so I put in some comments and placeholders.

Gamma correction has been supported since approximately the dawn of
time with a 3x8-bit LUT.

Obviously more modern hardware has far more complex colour management.
This is also supported, and is approximately described here:
https://dri.freedesktop.org/docs/drm/gpu/drm-kms.html#color-management-properties

Both planes and CRTCs can have a LUT -> matrix transform -> LUT
pipeline. There are also additional properties for fixed transforms,
e.g. limited 16-235 <-> full 0-255 range translation.

Cheers,
Daniel
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

  reply	other threads:[~2019-09-27 12:44 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-23 19:32 [PATCH v2 0/4] drm/panel: Extend panels to report their types Laurent Pinchart
2019-08-23 19:32 ` [PATCH v2 1/4] drm/panel: Add missing drm_panel_init() in panel drivers Laurent Pinchart
2019-08-24  8:48   ` Sam Ravnborg
2019-08-23 19:32 ` [PATCH v2 2/4] drm/panel: Initialise panel dev and funcs through drm_panel_init() Laurent Pinchart
2019-08-24  8:50   ` Sam Ravnborg
2019-08-23 19:32 ` [PATCH v2 3/4] drm/panel: Add and fill drm_panel type field Laurent Pinchart
2019-08-24  9:54   ` DRM_MODE_CONNECTOR_PANEL? [Was: drm/panel: Add and fill drm_panel type field] Sam Ravnborg
2019-08-24 14:02     ` Laurent Pinchart
2019-09-04 13:13       ` Laurent Pinchart
2019-09-27 12:37     ` Linus Walleij
2019-09-27 12:44       ` Daniel Stone [this message]
2019-09-27 14:28         ` Tomi Valkeinen
2019-10-08  8:42           ` Daniel Vetter
2019-08-26  7:46   ` [PATCH v2 3/4] drm/panel: Add and fill drm_panel type field Boris Brezillon
2019-08-23 19:32 ` [PATCH v2 4/4] drm/bridge: panel: Infer connector type from panel by default Laurent Pinchart
2019-08-26  7:47   ` Boris Brezillon

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