From: Philipp Zabel <p.zabel@pengutronix.de>
To: Ying Liu <gnuiyl@gmail.com>
Cc: kernel@pengutronix.de, DRI Development <dri-devel@lists.freedesktop.org>
Subject: Re: [PATCH 1/9] drm/imx: ipuv3-plane: make sure x/y offsets are even in case of chroma subsampling
Date: Wed, 19 Oct 2016 11:30:28 +0200 [thread overview]
Message-ID: <1476869428.3054.18.camel@pengutronix.de> (raw)
In-Reply-To: <CAOcKUNW7HUB=dA52eexDzKFSKRXnYuT171WqNn3e3Lo1Xogo6Q@mail.gmail.com>
Am Mittwoch, den 19.10.2016, 15:12 +0800 schrieb Ying Liu:
> On Wed, Oct 19, 2016 at 12:07 AM, Philipp Zabel <p.zabel@pengutronix.de> wrote:
> > Odd x/y offsets are not allowed for chroma subsampled planar YUV
> > formats.
> >
> > Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
> > ---
> > drivers/gpu/drm/imx/ipuv3-plane.c | 8 ++++++++
> > 1 file changed, 8 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/imx/ipuv3-plane.c b/drivers/gpu/drm/imx/ipuv3-plane.c
> > index 5c34299..3a03fd8 100644
> > --- a/drivers/gpu/drm/imx/ipuv3-plane.c
> > +++ b/drivers/gpu/drm/imx/ipuv3-plane.c
> > @@ -259,6 +259,7 @@ static int ipu_plane_atomic_check(struct drm_plane *plane,
> > struct drm_framebuffer *fb = state->fb;
> > struct drm_framebuffer *old_fb = old_state->fb;
> > unsigned long eba, ubo, vbo, old_ubo, old_vbo;
> > + int hsub, vsub;
> >
> > /* Ok to disable */
> > if (!fb)
> > @@ -372,6 +373,13 @@ static int ipu_plane_atomic_check(struct drm_plane *plane,
> >
> > if (old_fb && old_fb->pitches[1] != fb->pitches[1])
> > crtc_state->mode_changed = true;
> > +
> > + /* x and y offsets must be even in case of chroma subsampling */
>
> True for x offsets, but not for y offsets, e.g., NV16.
That should be ok, for NV16 vsub==1, so (y&(vsub-1)) will always be
false. Only for 4:2:0 subsampled formats is vsub==2, and then
(y&(vsub-1)) will only be true if y is odd.
I'll change the comment to:
/*
* The x/y offsets must be even in case of horizontal/vertical
* chroma subsampling.
*/
regards
Philipp
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next prev parent reply other threads:[~2016-10-19 9:30 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-18 16:07 [PATCH 1/9] drm/imx: ipuv3-plane: make sure x/y offsets are even in case of chroma subsampling Philipp Zabel
2016-10-18 16:07 ` [PATCH 2/9] drm/imx: ipuv3-plane: disable local alpha for planes without alpha channel Philipp Zabel
2016-10-19 7:17 ` Ying Liu
2016-10-18 16:07 ` [PATCH 3/9] drm/imx: ipuv3-plane: request modeset if plane offsets changed Philipp Zabel
2016-10-19 7:19 ` Ying Liu
2016-10-18 16:07 ` [PATCH 4/9] drm/imx: ipuv3-plane: merge ipu_plane_atomic_set_base into atomic_update Philipp Zabel
2016-10-19 7:20 ` Ying Liu
2016-10-18 16:07 ` [PATCH 5/9] drm/imx: ipuv3-plane: let drm_plane_state_to_ubo/vbo handle chroma subsampling other than 4:2:0 Philipp Zabel
2016-10-19 7:42 ` Ying Liu
2016-10-18 16:07 ` [PATCH 6/9] gpu: ipu-cpmem: Add missing YVU422 case to ipu_cpmem_set_yuv_planar Philipp Zabel
2016-10-19 7:44 ` Ying Liu
2016-10-18 16:07 ` [PATCH 7/9] gpu: ipu-v3: add YUV 4:4:4 support Philipp Zabel
2016-10-19 7:47 ` Ying Liu
2016-10-19 9:30 ` Philipp Zabel
2016-10-18 16:07 ` [PATCH 8/9] drm/imx: ipuv3-plane: add support for YUV 4:2:2 and 4:4:4, NV12, and NV16 formats Philipp Zabel
2016-10-19 7:49 ` Ying Liu
2016-10-19 9:33 ` Philipp Zabel
2016-10-18 16:07 ` [PATCH 9/9] gpu: ipu-v3: initially clear all interrupts Philipp Zabel
2016-10-19 7:50 ` Ying Liu
2016-10-19 7:12 ` [PATCH 1/9] drm/imx: ipuv3-plane: make sure x/y offsets are even in case of chroma subsampling Ying Liu
2016-10-19 9:30 ` Philipp Zabel [this message]
2016-10-19 7:58 ` Ville Syrjälä
2016-10-19 9:30 ` Philipp Zabel
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