[PATCH v2 6/6] drm/i915: Do not do fb src adjustments for NV12
Srinivas, Vidya
vidya.srinivas at intel.com
Tue Apr 17 04:58:54 UTC 2018
> -----Original Message-----
> From: Srinivas, Vidya
> Sent: Tuesday, April 17, 2018 8:17 AM
> To: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>; intel-gfx-
> trybot at lists.freedesktop.org
> Cc: Kamath, Sunil <sunil.kamath at intel.com>; Saarinen, Jani
> <jani.saarinen at intel.com>
> Subject: RE: [PATCH v2 6/6] drm/i915: Do not do fb src adjustments for
> NV12
>
>
>
> > -----Original Message-----
> > From: Maarten Lankhorst [mailto:maarten.lankhorst at linux.intel.com]
> > Sent: Monday, April 16, 2018 8:00 PM
> > To: Srinivas, Vidya <vidya.srinivas at intel.com<mailto:vidya.srinivas at intel.com>>; intel-gfx-
> > trybot at lists.freedesktop.org<mailto:trybot at lists.freedesktop.org>
> > Cc: Kamath, Sunil <sunil.kamath at intel.com<mailto:sunil.kamath at intel.com>>; Saarinen, Jani
> > <jani.saarinen at intel.com<mailto:jani.saarinen at intel.com>>
> > Subject: Re: [PATCH v2 6/6] drm/i915: Do not do fb src adjustments for
> > NV12
> >
> > Hmm, more thought about src adjustments...
> >
> > Op 13-04-18 om 07:22 schreef Vidya Srinivas:
> > > We skip src trunction/adjustments for
> > > NV12 case and handle the sizes directly.
> > > Without this, pipe fifo underruns are seen on APL/KBL.
> > >
> > > v2: For NV12, making the src coordinates multiplier of 4
> > >
> > > Credits-to: Maarten Lankhorst <maarten.lankhorst at linux.intel.com<mailto:maarten.lankhorst at linux.intel.com>>
> > > Signed-off-by: Vidya Srinivas <vidya.srinivas at intel.com<mailto:vidya.srinivas at intel.com>>
> > > ---
> > > drivers/gpu/drm/i915/intel_display.c | 11 +++++++++++
> > > drivers/gpu/drm/i915/intel_sprite.c | 15 +++++++++++++++
> > > 2 files changed, 26 insertions(+)
> > >
> > > diff --git a/drivers/gpu/drm/i915/intel_display.c
> > > b/drivers/gpu/drm/i915/intel_display.c
> > > index bc83f10..f64708f 100644
> > > --- a/drivers/gpu/drm/i915/intel_display.c
> > > +++ b/drivers/gpu/drm/i915/intel_display.c
> > > @@ -12978,6 +12978,10 @@ intel_check_primary_plane(struct
> > intel_plane *plane,
> > > bool can_position = false;
> > > int ret;
> > > uint32_t pixel_format = 0;
> > > + struct drm_plane_state *plane_state = &state->base;
> > > + struct drm_rect *src = &plane_state->src;
> > > +
> > > + *src = drm_plane_state_src(plane_state);
> > >
> > > if (INTEL_GEN(dev_priv) >= 9) {
> > > /* use scaler when colorkey is not required */ @@ -13001,6
> > > +13005,13 @@ intel_check_primary_plane(struct intel_plane *plane,
> > > if (!state->base.fb)
> > > return 0;
> > >
> > > + if (pixel_format == DRM_FORMAT_NV12) {
> > > + src->x1 = (((src->x1 >> 16)/4)*4) << 16;
> > > + src->x2 = (((src->x2 >> 16)/4)*4) << 16;
> > > + src->y1 = (((src->y1 >> 16)/4)*4) << 16;
> > > + src->y2 = (((src->y2 >> 16)/4)*4) << 16;
> > > + }
> >
> > Lets reject non multiple of 4 coordinates for plane_state's src_x and
> > src_y, and before adjustment also reject non multiple of 4
> > src_w/src_h.fter that we can also reject clipping to the right/bottom
> > edge of the screen, if the pipe_src_w/h is not a multiple of 4. That
> > way an application trying to go beyond the screen.
>
> kms_plane_scaling and some other tests during execution generate lots of
> non mult of 4 buffer width/height. All these tests will show fail in the IGT
> BAT.
> In some cases, even thought the width and height will be multiple of 4
> before the Adjustment (say our 16x16 buffer), this after adjustment
> becomes a 15 in intel_check_sprite_plane.
> This again would cause underrun. If we reject non multiple of 4s in our
> skl_update_scaler also, then even simple tests with 16x16 like rotation will
> fail due to it getting adjusted.
Example:
During kms_plane_scaling-with-rotation execution - print cooridinates here: src->x1, src->x2, src->y1, src->y2
[ 43.542044] [drm:intel_check_sprite_plane] *ERROR* Before adjust: 1040: 0 16 0 16
[ 43.542054] [drm:intel_check_sprite_plane] *ERROR* After adjust: 1054: 0 15 0 15
[ 43.542058] [drm:intel_check_sprite_plane] *ERROR* Before check plane surface: 1135: 0 15 0 15
[ 43.570827] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe A FIFO underrun
16x16 becomes 15x15 after rect adjustment in check_sprite_plane
During kms_plane_scaling-with-clipping-clamping – print coordinates here src->x1, src->x2, src->y1, src->y2
[ 125.432029] [drm:intel_check_primary_plane] *ERROR* Before check plane state: 12998: 0 300 0 300
[ 125.432041] [drm:intel_check_primary_plane] *ERROR* After check plane state: 13004: 0 257 0 159
[ 128.057081] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe A FIFO underrun
300x300 after primary plane clipping becomes 257 in check_primary_plane
All these generate fifo underruns. In the first example here, 16x16, before adjustment we check if it is multiplier
of 4, and since it is, we allow. But after rect_adjust it becomes 15x15
In example 2, clipping clamping, 300x300 is the value before clipping in primary plane, since it is a multiple of 4, we allow
But after clipping it becomes 257x159.
>
> >
> > skl_check_plane_surface could do all the fixups and is allowed to
> > return an error code, so we could put all SKL specific NV12 handling in
> there.
> > It doesn't matter that we calculate potentially illegal values, if we
> > never program them and return -EINVAL there. If it turns out we've
> > been too paranoid we could relax the condition.
> >
> > This would mean unified handling for NV12 for primary and sprite. :)
> >
> > > if (INTEL_GEN(dev_priv) >= 9) {
> > > ret = skl_check_plane_surface(crtc_state, state);
> > > if (ret)
> > > diff --git a/drivers/gpu/drm/i915/intel_sprite.c
> > > b/drivers/gpu/drm/i915/intel_sprite.c
> > > index 8b7947d..c1dd85e 100644
> > > --- a/drivers/gpu/drm/i915/intel_sprite.c
> > > +++ b/drivers/gpu/drm/i915/intel_sprite.c
> > > @@ -1035,11 +1035,20 @@ intel_check_sprite_plane(struct intel_plane
> > *plane,
> > > return vscale;
> > > }
> > >
> > > + if (fb->format->format == DRM_FORMAT_NV12) {
> > > + if (src->x2 >> 16 == 16)
> > > + src->x2 = 16 << 16;
> > > + if (src->y2 >> 16 == 16)
> > > + src->y2 = 16 << 16;
> > This part doesn't look required, the magic below for the nv12 format
> > is similar.. Just conditionally call adjust_size for format != NV12.
This part is required only if we retain 16x16 buffer, Because after adjust_size it becomes
15x15 as I have mentioned above. Then our minimum criteria for NV12 fails and our igt buffer
As of now is 16x16. To get a IGT pass I had added this work around.
> > :)
> > > + goto nv12_min_no_clip;
> > > + }
> > > +
> > > /* Make the source viewport size an exact multiple of the
> > scaling factors. */
> > > drm_rect_adjust_size(src,
> > > drm_rect_width(dst) * hscale -
> > drm_rect_width(src),
> > > drm_rect_height(dst) * vscale -
> > drm_rect_height(src));
> > >
> > > +nv12_min_no_clip:
> > > drm_rect_rotate_inv(src, fb->width << 16, fb->height << 16,
> > > state->base.rotation);
> > >
> > > @@ -1105,6 +1114,12 @@ intel_check_sprite_plane(struct intel_plane
> > *plane,
> > > src->x2 = (src_x + src_w) << 16;
> > > src->y1 = src_y << 16;
> > > src->y2 = (src_y + src_h) << 16;
> > > + if (fb->format->format == DRM_FORMAT_NV12) {
> > > + src->x1 = (((src->x1 >> 16)/4)*4) << 16;
> > > + src->x2 = (((src->x2 >> 16)/4)*4) << 16;
> > > + src->y1 = (((src->y1 >> 16)/4)*4) << 16;
> > > + src->y2 = (((src->y2 >> 16)/4)*4) << 16;
> > > + }
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