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Date:   Tue, 15 Jan 2019 12:24:18 +0000
From:   Liviu Dudau <Liviu.Dudau@arm.com>
To:     Ayan Halder <Ayan.Halder@arm.com>,
        Brian Starkey <Brian.Starkey@arm.com>,
        "john.stultz@linaro.org" <john.stultz@linaro.org>,
        "seanpaul@google.com" <seanpaul@google.com>,
        "malidp@foss.arm.com" <malidp@foss.arm.com>,
        "dri-devel@lists.freedesktop.org" <dri-devel@lists.freedesktop.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        nd <nd@arm.com>
Subject: Re: [PATCH] [RFC] drm_hwcomposer: Add support for Arm Framebuffer
 Compression (AFBC) modifiers.
Message-ID: <20190115122418.GS20661@e110455-lin.cambridge.arm.com>
References: <1547479696-14376-1-git-send-email-ayan.halder@arm.com>
 <20190115120547.GL10517@phenom.ffwll.local>
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On Tue, Jan 15, 2019 at 01:05:47PM +0100, Daniel Vetter wrote:
> On Mon, Jan 14, 2019 at 03:28:27PM +0000, Ayan Halder wrote:
> > One needs to translate the Gralloc buffer flags for AFBC (eg
> > MALI_GRALLOC_INTFMT_AFBC_BASIC) to the corresponding linux kernel drm modifiers.
> > This gets passed to libdrm via drmModeAddFB2WithModifiers.
> > 
> > Signed-off-by: Ayan Kumar Halder <ayan.halder@arm.com>
> > 
> > /-- Note for reviewer
> > I was able to get this working for Android P on Juno with Mali DP650 and Mali
> > T860 gpu(with some additional hacks). I have not yet validated this hikey960.
> > 
> > I have used the following components:-
> > 1. Gralloc (from https://android.googlesource.com/device/linaro/hikey/+/master/gralloc960)
> >   - Built with MALI_MMSS=1
> > 2. Libdrm (from git://anongit.freedesktop.org/mesa/drm)
> >   - You would need drm_fourcc.h and gralloc_handle.h
> > --/
> 
> I thought drm_hwcomposer has switched over to gitlab merge requests?
> README at least says so:
> 
> https://gitlab.freedesktop.org/drm-hwcomposer/drm-hwcomposer

So are we to send pull requests for RFCs as well?

Best regards,
Liviu

> 
> Cheers, Daniel
> 
> > ---
> >  platformdrmgeneric.cpp | 42 ++++++++++++++++++++++++++++++++++++++++++
> >  platformdrmgeneric.h   |  2 ++
> >  platformhisi.cpp       | 14 ++++++++++++--
> >  3 files changed, 56 insertions(+), 2 deletions(-)
> > 
> > diff --git a/platformdrmgeneric.cpp b/platformdrmgeneric.cpp
> > index 503c04a..a520224 100644
> > --- a/platformdrmgeneric.cpp
> > +++ b/platformdrmgeneric.cpp
> > @@ -18,6 +18,7 @@
> >  
> >  #include "platformdrmgeneric.h"
> >  #include "drmdevice.h"
> > +#include "mali_gralloc_formats.h"
> >  #include "platform.h"
> >  
> >  #include <drm/drm_fourcc.h>
> > @@ -83,6 +84,31 @@ uint32_t DrmGenericImporter::ConvertHalFormatToDrm(uint32_t hal_format) {
> >    }
> >  }
> >  
> > +uint64_t DrmGenericImporter::ConvertGrallocFormatToDrmModifiers(uint64_t flags,
> > +                                                                bool is_rgb) {
> > +  uint64_t features = 0;
> > +
> > +  if (flags & MALI_GRALLOC_INTFMT_AFBC_BASIC)
> > +    features |= AFBC_FORMAT_MOD_BLOCK_SIZE_16x16;
> > +
> > +  if (is_rgb)
> > +    features |= AFBC_FORMAT_MOD_YTR;
> > +
> > +  if (flags & MALI_GRALLOC_INTFMT_AFBC_SPLITBLK)
> > +    features |= (AFBC_FORMAT_MOD_SPLIT | AFBC_FORMAT_MOD_SPARSE);
> > +
> > +  if (flags & MALI_GRALLOC_INTFMT_AFBC_WIDEBLK)
> > +    features |= AFBC_FORMAT_MOD_BLOCK_SIZE_32x8;
> > +
> > +  if (flags & MALI_GRALLOC_INTFMT_AFBC_TILED_HEADERS)
> > +    features |= AFBC_FORMAT_MOD_TILED;
> > +
> > +  if (features)
> > +    return DRM_FORMAT_MOD_ARM_AFBC(features);
> > +  else
> > +    return 0;
> > +}
> > +
> >  uint32_t DrmGenericImporter::DrmFormatToBitsPerPixel(uint32_t drm_format) {
> >    switch (drm_format) {
> >      case DRM_FORMAT_ARGB8888:
> > @@ -101,6 +127,22 @@ uint32_t DrmGenericImporter::DrmFormatToBitsPerPixel(uint32_t drm_format) {
> >    }
> >  }
> >  
> > +bool DrmGenericImporter::IsDrmFormatRgb(uint32_t drm_format) {
> > +  switch (drm_format) {
> > +    case DRM_FORMAT_ARGB8888:
> > +    case DRM_FORMAT_XBGR8888:
> > +    case DRM_FORMAT_ABGR8888:
> > +    case DRM_FORMAT_BGR888:
> > +    case DRM_FORMAT_BGR565:
> > +      return true;
> > +    case DRM_FORMAT_YVU420:
> > +      return false;
> > +    default:
> > +      ALOGE("Unsupported format %u assuming rgb?", drm_format);
> > +      return true;
> > +  }
> > +}
> > +
> >  int DrmGenericImporter::ImportBuffer(buffer_handle_t handle, hwc_drm_bo_t *bo) {
> >    gralloc_handle_t *gr_handle = gralloc_handle(handle);
> >    if (!gr_handle)
> > diff --git a/platformdrmgeneric.h b/platformdrmgeneric.h
> > index 233ba55..43cb618 100644
> > --- a/platformdrmgeneric.h
> > +++ b/platformdrmgeneric.h
> > @@ -36,6 +36,8 @@ class DrmGenericImporter : public Importer {
> >    bool CanImportBuffer(buffer_handle_t handle) override;
> >  
> >    uint32_t ConvertHalFormatToDrm(uint32_t hal_format);
> > +  uint64_t ConvertGrallocFormatToDrmModifiers(uint64_t flags, bool is_rgb);
> > +  bool IsDrmFormatRgb(uint32_t drm_format);
> >    uint32_t DrmFormatToBitsPerPixel(uint32_t drm_format);
> >  
> >   private:
> > diff --git a/platformhisi.cpp b/platformhisi.cpp
> > index 76fe1e7..1cb7e2c 100644
> > --- a/platformhisi.cpp
> > +++ b/platformhisi.cpp
> > @@ -71,6 +71,9 @@ int HisiImporter::Init() {
> >  }
> >  
> >  int HisiImporter::ImportBuffer(buffer_handle_t handle, hwc_drm_bo_t *bo) {
> > +  bool is_rgb;
> > +  uint64_t modifiers[4] = {0};
> > +
> >    memset(bo, 0, sizeof(hwc_drm_bo_t));
> >  
> >    private_handle_t const *hnd = reinterpret_cast<private_handle_t const *>(
> > @@ -94,6 +97,10 @@ int HisiImporter::ImportBuffer(buffer_handle_t handle, hwc_drm_bo_t *bo) {
> >    if (fmt < 0)
> >      return fmt;
> >  
> > +  is_rgb = IsDrmFormatRgb(fmt);
> > +  modifiers[0] = ConvertGrallocFormatToDrmModifiers(hnd->internal_format,
> > +                                                    is_rgb);
> > +
> >    bo->width = hnd->width;
> >    bo->height = hnd->height;
> >    bo->hal_format = hnd->req_format;
> > @@ -129,8 +136,11 @@ int HisiImporter::ImportBuffer(buffer_handle_t handle, hwc_drm_bo_t *bo) {
> >        break;
> >    }
> >  
> > -  ret = drmModeAddFB2(drm_->fd(), bo->width, bo->height, bo->format,
> > -                      bo->gem_handles, bo->pitches, bo->offsets, &bo->fb_id, 0);
> > +  ret = drmModeAddFB2WithModifiers(drm_->fd(), bo->width, bo->height,
> > +                                   bo->format, bo->gem_handles, bo->pitches,
> > +                                   bo->offsets, modifiers, &bo->fb_id,
> > +                                   modifiers[0] ? DRM_MODE_FB_MODIFIERS : 0);
> > +
> >    if (ret) {
> >      ALOGE("could not create drm fb %d", ret);
> >      return ret;
> > -- 
> > 2.7.4
> > 
> > _______________________________________________
> > 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

-- 
====================
| I would like to |
| fix the world,  |
| but they're not |
| giving me the   |
 \ source code!  /
  ---------------
    ¯\_(ツ)_/¯