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SubjectRe: [PATCH] drm/komeda: Adds VRR support
On Wed, Jul 03, 2019 at 07:26:16AM +0000, Lowry Li (Arm Technology China) wrote:
> Adds a new drm property "vrr" and "vrr_enable" and implemented
> the set/get functions, through which userspace could set vfp
> data to komeda.
>
> Signed-off-by: Lowry Li (Arm Technology China) <lowry.li@arm.com>
> ---
> .../gpu/drm/arm/display/komeda/d71/d71_component.c | 6 +++
> drivers/gpu/drm/arm/display/komeda/komeda_crtc.c | 62 ++++++++++++++++++++++
> drivers/gpu/drm/arm/display/komeda/komeda_kms.h | 12 +++++
> .../gpu/drm/arm/display/komeda/komeda_pipeline.h | 4 +-
> 4 files changed, 83 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/arm/display/komeda/d71/d71_component.c b/drivers/gpu/drm/arm/display/komeda/d71/d71_component.c
> index ed3f273..c1355f5 100644
> --- a/drivers/gpu/drm/arm/display/komeda/d71/d71_component.c
> +++ b/drivers/gpu/drm/arm/display/komeda/d71/d71_component.c
> @@ -1065,6 +1065,7 @@ static void d71_timing_ctrlr_update(struct komeda_component *c,
> struct komeda_component_state *state)
> {
> struct drm_crtc_state *crtc_st = state->crtc->state;
> + struct komeda_crtc_state *kcrtc_st = to_kcrtc_st(crtc_st);
> struct drm_display_mode *mode = &crtc_st->adjusted_mode;
> u32 __iomem *reg = c->reg;
> u32 hactive, hfront_porch, hback_porch, hsync_len;
> @@ -1102,6 +1103,9 @@ static void d71_timing_ctrlr_update(struct komeda_component *c,
> value |= BS_CTRL_DL;
> }
>
> + if (kcrtc_st->en_vrr)
> + malidp_write32_mask(reg, BS_VINTERVALS, 0x3FFF, kcrtc_st->vfp);
> +
> malidp_write32(reg, BLK_CONTROL, value);
> }
>
> @@ -1171,6 +1175,8 @@ static int d71_timing_ctrlr_init(struct d71_dev *d71,
> ctrlr = to_ctrlr(c);
>
> ctrlr->supports_dual_link = true;
> + ctrlr->supports_vrr = true;
> + set_range(&ctrlr->vfp_range, 0, 0x3FF);
>
> return 0;
> }
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
> index 4f580b0..3744e6d 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
> @@ -467,6 +467,8 @@ static void komeda_crtc_reset(struct drm_crtc *crtc)
>
> state = kzalloc(sizeof(*state), GFP_KERNEL);
> if (state) {
> + state->vfp = 0;
> + state->en_vrr = 0;
> crtc->state = &state->base;
> crtc->state->crtc = crtc;
> }
> @@ -487,6 +489,8 @@ static void komeda_crtc_reset(struct drm_crtc *crtc)
> new->affected_pipes = old->active_pipes;
> new->clock_ratio = old->clock_ratio;
> new->max_slave_zorder = old->max_slave_zorder;
> + new->vfp = old->vfp;
> + new->en_vrr = old->en_vrr;
>
> return &new->base;
> }
> @@ -525,6 +529,30 @@ static void komeda_crtc_vblank_disable(struct drm_crtc *crtc)
>
> if (property == kcrtc->clock_ratio_property) {
> *val = kcrtc_st->clock_ratio;
> + } else if (property == kcrtc->vrr_property) {
> + *val = kcrtc_st->vfp;
> + } else if (property == kcrtc->vrr_enable_property) {
> + *val = kcrtc_st->en_vrr;
> + } else {
> + DRM_DEBUG_DRIVER("Unknown property %s\n", property->name);
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static int komeda_crtc_atomic_set_property(struct drm_crtc *crtc,
> + struct drm_crtc_state *state,
> + struct drm_property *property,
> + uint64_t val)
> +{
> + struct komeda_crtc *kcrtc = to_kcrtc(crtc);
> + struct komeda_crtc_state *kcrtc_st = to_kcrtc_st(state);
> +
> + if (property == kcrtc->vrr_property) {
> + kcrtc_st->vfp = val;
> + } else if (property == kcrtc->vrr_enable_property) {
> + kcrtc_st->en_vrr = val;
> } else {
> DRM_DEBUG_DRIVER("Unknown property %s\n", property->name);
> return -EINVAL;
> @@ -544,6 +572,7 @@ static void komeda_crtc_vblank_disable(struct drm_crtc *crtc)
> .enable_vblank = komeda_crtc_vblank_enable,
> .disable_vblank = komeda_crtc_vblank_disable,
> .atomic_get_property = komeda_crtc_atomic_get_property,
> + .atomic_set_property = komeda_crtc_atomic_set_property,
> };
>
> int komeda_kms_setup_crtcs(struct komeda_kms_dev *kms,
> @@ -613,6 +642,35 @@ static int komeda_crtc_create_slave_planes_property(struct komeda_crtc *kcrtc)
> return 0;
> }
>
> +static int komeda_crtc_create_vrr_property(struct komeda_crtc *kcrtc)
> +{
> + struct drm_crtc *crtc = &kcrtc->base;
> + struct drm_property *prop;
> + struct komeda_timing_ctrlr *ctrlr = kcrtc->master->ctrlr;
> +
> + if (!ctrlr->supports_vrr)
> + return 0;
> +
> + prop = drm_property_create_range(crtc->dev, DRM_MODE_PROP_ATOMIC, "vrr",
> + ctrlr->vfp_range.start,
> + ctrlr->vfp_range.end);
> + if (!prop)
> + return -ENOMEM;
> +
> + drm_object_attach_property(&crtc->base, prop, 0);
> + kcrtc->vrr_property = prop;
> +
> + prop = drm_property_create_bool(crtc->dev, DRM_MODE_PROP_ATOMIC,
> + "enable_vrr");

Uh, what exactly are you doing reinventing uapi properties that we already
standardized?

> + if (!prop)
> + return -ENOMEM;
> +
> + drm_object_attach_property(&crtc->base, prop, 0);
> + kcrtc->vrr_enable_property = prop;
> +
> + return 0;
> +}
> +
> static struct drm_plane *
> get_crtc_primary(struct komeda_kms_dev *kms, struct komeda_crtc *crtc)
> {
> @@ -659,6 +717,10 @@ static int komeda_crtc_add(struct komeda_kms_dev *kms,
> if (err)
> return err;
>
> + err = komeda_crtc_create_vrr_property(kcrtc);
> + if (err)
> + return err;
> +
> return err;
> }
>
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_kms.h b/drivers/gpu/drm/arm/display/komeda/komeda_kms.h
> index dc1d436..d0cf838 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_kms.h
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_kms.h
> @@ -98,6 +98,12 @@ struct komeda_crtc {
>
> /** @slave_planes_property: property for slaves of the planes */
> struct drm_property *slave_planes_property;

And this seems to not be the first time this happened. Looking at komeda
with a quick git grep on properties you've actually accumulated quite a
pile of such driver properties already. Where's the userspace for this?
Where's the uapi discussions for this stuff? Where's the igt tests for
this (yes a bunch are after we agreed to have testcases for this).

I know that in the past we've been somewhat sloppy properties, but that
was a mistake and we've cranked down on this hard. Probably need to fix
this with a pile of reverts and start over.
-Daniel

> +
> + /** @vrr_property: property for variable refresh rate */
> + struct drm_property *vrr_property;
> +
> + /** @vrr_enable_property: property for enable/disable the vrr */
> + struct drm_property *vrr_enable_property;
> };
>
> /**
> @@ -126,6 +132,12 @@ struct komeda_crtc_state {
>
> /** @max_slave_zorder: the maximum of slave zorder */
> u32 max_slave_zorder;
> +
> + /** @vfp: the value of vertical front porch */
> + u32 vfp;
> +
> + /** @en_vrr: enable status of variable refresh rate */
> + u8 en_vrr : 1;
> };
>
> /** struct komeda_kms_dev - for gather KMS related things */
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h b/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h
> index 00e8083..66d7664 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h
> @@ -336,7 +336,9 @@ struct komeda_improc_state {
> /* display timing controller */
> struct komeda_timing_ctrlr {
> struct komeda_component base;
> - u8 supports_dual_link : 1;
> + u8 supports_dual_link : 1,
> + supports_vrr : 1;
> + struct malidp_range vfp_range;
> };
>
> struct komeda_timing_ctrlr_state {
> --
> 1.9.1
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

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