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From: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
To: Jacopo Mondi <jacopo+renesas@jmondi.org>,
	laurent.pinchart@ideasonboard.com, geert@linux-m68k.org,
	horms@verge.net.au, uli+renesas@fpond.eu,
	VenkataRajesh.Kalakodima@in.bosch.com
Cc: airlied@linux.ie, daniel@ffwll.ch, koji.matsuoka.xm@renesas.com,
	muroya@ksk.co.jp, Harsha.ManjulaMallikarjun@in.bosch.com,
	linux-renesas-soc@vger.kernel.org,
	dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4 6/9] drm: rcar-du: crtc: Enable and disable CMMs
Date: Wed, 11 Sep 2019 19:40:27 +0100
Message-ID: <bc443263-5f20-f022-34c8-1e521243dec1@ideasonboard.com> (raw)
In-Reply-To: <20190906135436.10622-7-jacopo+renesas@jmondi.org>

Hi Jacopo,

On 06/09/2019 14:54, Jacopo Mondi wrote:
> Enable/disable the CMM associated with a CRTC at CRTC start and stop
> time and enable the CMM unit through the Display Extensional Functions
> register at group setup time.
> 
> Reviewed-by: Ulrich Hecht <uli+renesas@fpond.eu>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
> ---
>  drivers/gpu/drm/rcar-du/rcar_du_crtc.c  | 7 +++++++
>  drivers/gpu/drm/rcar-du/rcar_du_group.c | 8 ++++++++
>  drivers/gpu/drm/rcar-du/rcar_du_regs.h  | 5 +++++
>  3 files changed, 20 insertions(+)
> 
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> index 23f1d6cc1719..3dac605c3a67 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
> @@ -21,6 +21,7 @@
>  #include <drm/drm_plane_helper.h>
>  #include <drm/drm_vblank.h>
>  
> +#include "rcar_cmm.h"
>  #include "rcar_du_crtc.h"
>  #include "rcar_du_drv.h"
>  #include "rcar_du_encoder.h"
> @@ -619,6 +620,9 @@ static void rcar_du_crtc_stop(struct rcar_du_crtc *rcrtc)
>  	if (rcar_du_has(rcrtc->dev, RCAR_DU_FEATURE_VSP1_SOURCE))
>  		rcar_du_vsp_disable(rcrtc);
>  
> +	if (rcrtc->cmm)
> +		rcar_cmm_disable(rcrtc->cmm);
> +
>  	/*
>  	 * Select switch sync mode. This stops display operation and configures
>  	 * the HSYNC and VSYNC signals as inputs.
> @@ -686,6 +690,9 @@ static void rcar_du_crtc_atomic_enable(struct drm_crtc *crtc,
>  	}
>  
>  	rcar_du_crtc_start(rcrtc);
> +
> +	if (rcrtc->cmm)
> +		rcar_cmm_enable(rcrtc->cmm);
>  }
>  
>  static void rcar_du_crtc_atomic_disable(struct drm_crtc *crtc,
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_group.c b/drivers/gpu/drm/rcar-du/rcar_du_group.c
> index 9eee47969e77..25d0fc125d7a 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_group.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_group.c
> @@ -147,6 +147,14 @@ static void rcar_du_group_setup(struct rcar_du_group *rgrp)
>  
>  	rcar_du_group_setup_pins(rgrp);
>  
> +	if (rcar_du_has(rcdu, RCAR_DU_FEATURE_CMM)) {
> +		u32 defr7 = DEFR7_CODE
> +			  | (rgrp->cmms_mask & BIT(1) ? DEFR7_CMME1 : 0)
> +			  | (rgrp->cmms_mask & BIT(0) ? DEFR7_CMME0 : 0);
> +
> +		rcar_du_group_write(rgrp, DEFR7, defr7);
> +	}
> +

What's the effect here on platforms with a CMM, but with
CONFIG_DRM_RCAR_CMM unset?

Will this incorrectly configure the DU ?

Will it stall the display if the DU tries to interact with another
module which is not enabled?


>  	if (rcdu->info->gen >= 2) {
>  		rcar_du_group_setup_defr8(rgrp);
>  		rcar_du_group_setup_didsr(rgrp);
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_regs.h b/drivers/gpu/drm/rcar-du/rcar_du_regs.h
> index bc87f080b170..fb9964949368 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_regs.h
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_regs.h
> @@ -197,6 +197,11 @@
>  #define DEFR6_MLOS1		(1 << 2)
>  #define DEFR6_DEFAULT		(DEFR6_CODE | DEFR6_TCNE1)
>  
> +#define DEFR7			0x000ec
> +#define DEFR7_CODE		(0x7779 << 16)
> +#define DEFR7_CMME1		BIT(6)
> +#define DEFR7_CMME0		BIT(4)
> +
>  /* -----------------------------------------------------------------------------
>   * R8A7790-only Control Registers
>   */
> 


  reply index

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-06 13:54 [PATCH v4 0/9 drm: rcar-du: Add Color Management Module (CMM) Jacopo Mondi
2019-09-06 13:54 ` [PATCH v4 1/9] dt-bindings: display: renesas,cmm: Add R-Car CMM documentation Jacopo Mondi
2019-09-11 19:04   ` Kieran Bingham
2019-09-17 17:55   ` Rob Herring
2019-09-18 22:08   ` Laurent Pinchart
2019-09-06 13:54 ` [PATCH v4 2/9] dt-bindings: display, renesas,du: Document cmms property Jacopo Mondi
2019-09-11 16:06   ` Kieran Bingham
2019-09-17 17:58     ` Rob Herring
2019-09-06 13:54 ` [PATCH v4 3/9] drm: rcar-du: Add support for CMM Jacopo Mondi
2019-09-11 15:54   ` Kieran Bingham
2019-09-12  7:59     ` Jacopo Mondi
2019-09-12  9:49       ` Kieran Bingham
2019-09-18 22:55   ` Laurent Pinchart
2019-09-19  8:59     ` Kieran Bingham
2019-09-20 22:43       ` Laurent Pinchart
2019-10-10 17:46     ` Jacopo Mondi
2019-10-14 23:54       ` Laurent Pinchart
2019-09-06 13:54 ` [PATCH v4 4/9] drm: rcar-du: Claim CMM support for Gen3 SoCs Jacopo Mondi
2019-09-11 18:45   ` Kieran Bingham
2019-09-06 13:54 ` [PATCH v4 5/9] drm: rcar-du: kms: Initialize CMM instances Jacopo Mondi
2019-09-12  9:27   ` Kieran Bingham
2019-09-06 13:54 ` [PATCH v4 6/9] drm: rcar-du: crtc: Enable and disable CMMs Jacopo Mondi
2019-09-11 18:40   ` Kieran Bingham [this message]
2019-09-12  8:07     ` Jacopo Mondi
2019-09-12  9:19       ` Kieran Bingham
2019-09-18 23:23         ` Laurent Pinchart
2019-09-19  8:08           ` Kieran Bingham
2019-09-20 22:44             ` Laurent Pinchart
2019-09-06 13:54 ` [PATCH v4 7/9] drm: rcar-du: crtc: Register GAMMA_LUT properties Jacopo Mondi
2019-09-11 18:47   ` Kieran Bingham
2019-09-06 13:54 ` [PATCH v4 8/9] drm: rcar-du: kms: Update CMM in atomic commit tail Jacopo Mondi
2019-09-12  9:51   ` Kieran Bingham
2019-09-20 22:49   ` Laurent Pinchart
2019-09-30 20:53   ` Ezequiel Garcia
2019-10-01 19:20     ` Laurent Pinchart
2019-09-06 13:54 ` [PATCH v4 9/9] arm64: dts: renesas: Add CMM units to Gen3 SoCs Jacopo Mondi
2019-09-11 18:16   ` Kieran Bingham
2019-09-11 19:35     ` Geert Uytterhoeven

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