Re: [PATCH v5 5/8] drm: rcar-du: crtc: Control CMM operations

[Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>]

Hi Jacopo,

On 15/10/2019 11:46, Jacopo Mondi wrote:
> Implement CMM handling in the crtc begin and enable atomic callbacks,
> and enable CMM unit through the Display Extensional Functions

Extensional ?

Perhaps this should just be Display Extension Functions?
Wow - that's actually what they call it in the data-sheet.

> register at group setup time.
> 

Only a trivial extra blank line below that I can find... so

Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

> Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
> ---
>  drivers/gpu/drm/rcar-du/rcar_du_crtc.c  | 79 +++++++++++++++++++++++++
>  drivers/gpu/drm/rcar-du/rcar_du_group.c |  5 ++
>  drivers/gpu/drm/rcar-du/rcar_du_regs.h  |  5 ++
>  3 files changed, 89 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..4bc50a3f4a00 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"
> @@ -474,6 +475,70 @@ static void rcar_du_crtc_wait_page_flip(struct rcar_du_crtc *rcrtc)
>  	rcar_du_crtc_finish_page_flip(rcrtc);
>  }
>  
> +/* -----------------------------------------------------------------------------
> + * Color Management Module (CMM)
> + */
> +static int rcar_du_cmm_enable(struct drm_crtc *crtc)
> +{
> +	struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
> +
> +	if (!rcrtc->cmm)
> +		return 0;
> +
> +	return rcar_cmm_enable(rcrtc->cmm);
> +}
> +
> +static void rcar_du_cmm_disable(struct drm_crtc *crtc)
> +{
> +	struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
> +
> +	if (!rcrtc->cmm)
> +		return;
> +
> +	rcar_cmm_disable(rcrtc->cmm);
> +}
> +
> +static int rcar_du_cmm_check(struct drm_crtc *crtc,
> +			     struct drm_crtc_state *state)
> +{
> +	struct drm_property_blob *drm_lut = state->gamma_lut;
> +	struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
> +	struct device *dev = rcrtc->dev->dev;
> +
> +	if (!rcrtc->cmm || !drm_lut)
> +		return 0;
> +
> +	/* We only accept fully populated LUT tables. */
> +	if (CM2_LUT_SIZE * sizeof(struct drm_color_lut) !=
> +	    drm_lut->length) {
> +		dev_err(dev, "invalid gamma lut size: %lu bytes\n",
> +			drm_lut->length);
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static void rcar_du_cmm_setup(struct drm_crtc *crtc)
> +{
> +	struct drm_property_blob *drm_lut = crtc->state->gamma_lut;
> +	struct rcar_du_crtc *rcrtc = to_rcar_crtc(crtc);
> +	struct rcar_cmm_config cmm_config = {};
> +
> +	if (!rcrtc->cmm)
> +		return;
> +
> +	if (drm_lut) {
> +		cmm_config.lut.enable = true;
> +		cmm_config.lut.table = (struct drm_color_lut *)drm_lut->data;
> +
> +	} else {
> +		cmm_config.lut.enable = false;
> +	}
> +
> +	rcar_cmm_setup(rcrtc->cmm, &cmm_config);
> +}
> +
>  /* -----------------------------------------------------------------------------
>   * Start/Stop and Suspend/Resume
>   */
> @@ -619,6 +684,8 @@ 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);
>  
> +	rcar_du_cmm_disable(crtc);
> +
>  	/*
>  	 * Select switch sync mode. This stops display operation and configures
>  	 * the HSYNC and VSYNC signals as inputs.
> @@ -631,6 +698,7 @@ static void rcar_du_crtc_stop(struct rcar_du_crtc *rcrtc)
>  					   DSYSR_TVM_SWITCH);
>  
>  	rcar_du_group_start_stop(rcrtc->group, false);
> +

Extra blank line...


>  }
>  
>  /* -----------------------------------------------------------------------------
> @@ -642,6 +710,11 @@ static int rcar_du_crtc_atomic_check(struct drm_crtc *crtc,
>  {
>  	struct rcar_du_crtc_state *rstate = to_rcar_crtc_state(state);
>  	struct drm_encoder *encoder;
> +	int ret;
> +
> +	ret = rcar_du_cmm_check(crtc, state);
> +	if (ret)
> +		return ret;
>  
>  	/* Store the routes from the CRTC output to the DU outputs. */
>  	rstate->outputs = 0;
> @@ -667,6 +740,7 @@ static void rcar_du_crtc_atomic_enable(struct drm_crtc *crtc,
>  	struct rcar_du_crtc_state *rstate = to_rcar_crtc_state(crtc->state);
>  	struct rcar_du_device *rcdu = rcrtc->dev;
>  
> +	rcar_du_cmm_enable(crtc);
>  	rcar_du_crtc_get(rcrtc);
>  
>  	/*
> @@ -686,6 +760,7 @@ static void rcar_du_crtc_atomic_enable(struct drm_crtc *crtc,
>  	}
>  
>  	rcar_du_crtc_start(rcrtc);
> +	rcar_du_cmm_setup(crtc);
>  }
>  
>  static void rcar_du_crtc_atomic_disable(struct drm_crtc *crtc,
> @@ -739,6 +814,10 @@ static void rcar_du_crtc_atomic_begin(struct drm_crtc *crtc,
>  	 */
>  	rcar_du_crtc_get(rcrtc);
>  
> +	/* If the active state changed, we let .atomic_enable handle CMM. */
> +	if (crtc->state->color_mgmt_changed && !crtc->state->active_changed)
> +		rcar_du_cmm_setup(crtc);

Aha, this is quite neat for handling the timings.

> +
>  	if (rcar_du_has(rcrtc->dev, RCAR_DU_FEATURE_VSP1_SOURCE))
>  		rcar_du_vsp_atomic_begin(rcrtc);
>  }
> diff --git a/drivers/gpu/drm/rcar-du/rcar_du_group.c b/drivers/gpu/drm/rcar-du/rcar_du_group.c
> index 9eee47969e77..583de800a66d 100644
> --- a/drivers/gpu/drm/rcar-du/rcar_du_group.c
> +++ b/drivers/gpu/drm/rcar-du/rcar_du_group.c
> @@ -135,6 +135,7 @@ static void rcar_du_group_setup_didsr(struct rcar_du_group *rgrp)
>  static void rcar_du_group_setup(struct rcar_du_group *rgrp)
>  {
>  	struct rcar_du_device *rcdu = rgrp->dev;
> +	u32 defr7 = DEFR7_CODE;
>  
>  	/* Enable extended features */
>  	rcar_du_group_write(rgrp, DEFR, DEFR_CODE | DEFR_DEFE);
> @@ -147,6 +148,10 @@ static void rcar_du_group_setup(struct rcar_du_group *rgrp)
>  
>  	rcar_du_group_setup_pins(rgrp);
>  
> +	defr7 |= (rgrp->cmms_mask & BIT(1) ? DEFR7_CMME1 : 0) |
> +		 (rgrp->cmms_mask & BIT(0) ? DEFR7_CMME0 : 0);
> +	rcar_du_group_write(rgrp, DEFR7, defr7);
> +
>  	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
>   */
>