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Message-ID: <20191015133752.oyb3p6iyr3ekjxic@uno.localdomain>
Date: Tue, 15 Oct 2019 15:37:52 +0200
From: Jacopo Mondi <jacopo@...ndi.org>
To: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
Cc: Jacopo Mondi <jacopo+renesas@...ndi.org>,
laurent.pinchart@...asonboard.com, geert@...ux-m68k.org,
horms@...ge.net.au, uli+renesas@...nd.eu,
VenkataRajesh.Kalakodima@...bosch.com, airlied@...ux.ie,
daniel@...ll.ch, koji.matsuoka.xm@...esas.com, muroya@....co.jp,
Harsha.ManjulaMallikarjun@...bosch.com, ezequiel@...labora.com,
seanpaul@...omium.org, linux-renesas-soc@...r.kernel.org,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 5/8] drm: rcar-du: crtc: Control CMM operations
Hi Kieran,
On Tue, Oct 15, 2019 at 02:15:35PM +0100, Kieran Bingham wrote:
> 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@...asonboard.com>
>
> > Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.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...
>
Thanks for spotting this. I'm quite sure I run checkpatch (I just
re-did) and not warnings for the extra white space in the previous
patch, or this extra blank line o_0
>
> > }
> >
> > /* -----------------------------------------------------------------------------
> > @@ -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.
>
Yes, much more streamlined than what we had. Thanks Sean and Ezequiel :)
> > +
> > 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
> > */
> >
>
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