Re: [PATCH v6.1 5/8] drm: rcar-du: crtc: Control CMM operations

Hi Jacopo,

Thank you for the patch.

On Thu, Oct 17, 2019 at 03:44:09PM +0200, Jacopo Mondi wrote:

Implement CMM handling in the crtc begin and enable atomic callbacks, and enable CMM unit through the Display Extensional Functions register at group setup time.

Reviewed-by: Laurent Pinchart laurent.pinchart@ideasonboard.com Reviewed-by: Kieran Bingham kieran.bingham+renesas@ideasonboard.com Signed-off-by: Jacopo Mondi jacopo+renesas@jmondi.org

Reviewed-by: Laurent Pinchart laurent.pinchart@ideasonboard.com

---

v6 -> v6.1

• Drop check for CMM in rcar_du_cmm_check as if the gamma_table property is available, a CMM unit for this CRTC was registered
• Add TODO note to investigate how the activation order of CMM and CRTC impact on the first displayed fram

Thank you :-)

---

drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 61 +++++++++++++++++++++++++ drivers/gpu/drm/rcar-du/rcar_du_group.c | 10 ++++ drivers/gpu/drm/rcar-du/rcar_du_regs.h | 5 ++ 3 files changed, 76 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..3f0f16946f42 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 +475,45 @@ 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_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 (!drm_lut)

• return 0;
  

• /* We only accept fully populated LUT tables. */
• if (drm_color_lut_size(drm_lut) != CM2_LUT_SIZE) {

• 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.table = (struct drm_color_lut *)drm_lut->data;
  

• rcar_cmm_setup(rcrtc->cmm, &cmm_config);

+}

/* -----------------------------------------------------------------------------

• Start/Stop and Suspend/Resume

*/ @@ -619,6 +659,9 @@ 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.

@@ -642,6 +685,11 @@ 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 +715,8 @@ 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;

• if (rcrtc->cmm)

• rcar_cmm_enable(rcrtc->cmm);
  

  rcar_du_crtc_get(rcrtc);

  /*

@@ -686,6 +736,13 @@ static void rcar_du_crtc_atomic_enable(struct drm_crtc *crtc, }

rcar_du_crtc_start(rcrtc);

• /*

• * TODO: The chip manual indicates that CMM tables should be written
  

• * after the DU channel has been activated. Investigate the impact
  

• * of this restriction on the first displayed frame.
  

• */
  

• rcar_du_cmm_setup(crtc);

}

static void rcar_du_crtc_atomic_disable(struct drm_crtc *crtc, @@ -739,6 +796,10 @@ 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);
  

• 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..88a783ceb3e9 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 +148,15 @@ static void rcar_du_group_setup(struct rcar_du_group *rgrp)

rcar_du_group_setup_pins(rgrp);

• /*

• * TODO: Handle routing of the DU output to CMM dynamically, as we
  

• * should bypass CMM completely when no color management feature is
  

• * used.
  

• */
  

• 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

*/