Re: [PATCH] [RFC] drm_hwcomposer: Add support for Arm Framebuffer Compression (AFBC) modifiers.

[Daniel Vetter]

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@xxxxxxx>
> 
> /-- 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

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