This series adds AFBC support for Rockchip. It is inspired by:
https://chromium.googlesource.com/chromiumos/third_party/kernel/+/refs/heads...
This is the sixth iteration of the afbc series.
Compared to v5 it simplifies the way afbc-related helpers are exposed to their users.
A new struct drm_afbc_framebuffer is added, which stores afbc-related driver-specific data. Interested drivers need to explicitly allocate an instance of struct drm_afbc_framebuffer, use drm_gem_fb_init_with_funcs() call drm_gem_fb_afbc_init() and do their specific afbc-related checks.
There are 3 interested drivers: malidp, komeda and rockchip and I only have rockchip hardware. As Liviu reports, due to the coronavirus outbreak, it is difficult to test komeda now, so, according to his suggestion, I purposedly omit changes to komeda. Malidp is changed accordingly, though, which is a proof that it can be done. Then adding afbc support for rockchip follows the malidp example.
I kindly ask for reviewing the series. I need to mention that my ultimate goal is merging afbc for rockchip and I don't have other hardware, so some help from malidp developers/maintainers would be appreciated.
Rebased onto drm-misc-next.
v5..v6: - reworked the way afbc-specific helpers are exposed to drivers (Daniel) - not checking block size mask in drm_is_afbc (James) - fixed the test for afbc format (Boris) - documented unused afbc format modifier values in drm_afbc_get_superblock_wh() (Boris) - changed drm_is_afbc to a macro - renamed drm_gem_fb_lookup() to drm_gem_fb_objs_lookup() (James) - eliminated storing block/tile alignment constraint in struct drm_afbc_framebuffer (James) - eliminated storing afbc header alignment constraint in struct drm_afbc_framebuffer (James) - eliminated storing afbc payload's offset in struct drm_afbc_framebuffer (James) - moved to taking bpp value from drm_format_info except malidp which doesn't set it properly (James) - removed unrelated coding style fixes in rockchip (Boris) - consolidated 2-line error messages into one-liners in rockchip (Boris) - added checking that there is at most one AFBC plane in vop_crtc_atomic_check() (Boris) - added checking that AFBC format is indeed supported in rockchip_mod_supported() (Boris) - removed requirement of exactly one color plane in rockchip_mod_supported() - removed afbc_win hack in rockchip in favor of adding a field to crtc state and ensuring only one AFBC plane in crtc's atomic check (Boris)
v4..v5: - used proper way of subclassing drm_framebuffer (Daniel Vetter) - added documentation to exported functions (Liviu Dudau) - reordered new functions in drm_gem_framebuffer_helper.c to make a saner diff (Liviu Dudau) - used "2" suffix instead of "_special" for the special version of size checks (Liviu Dudau) - dropped unnecessarily added condition in drm_get_format_info() (Liviu Dudau) - dropped "block_size = 0;" trick in framebuffer_check() (Daniel Vetter) - relaxed sticking to 80 characters per line rule in some cases
v3..v4:
- addressed (some) comments from Daniel Stone, Ezequiel Garcia, Daniel Vetter and James Qian Wang - thank you for input - refactored helpers to ease accommodating drivers with afbc needs - moved afbc checks to helpers - converted komeda, malidp and (the newly added) rockchip to use the afbc helpers - eliminated a separate, dedicated source code file
v2..v3:
- addressed (some) comments from Daniel Stone, Liviu Dudau, Daniel Vetter and Brian Starkey - thank you all
In this iteration some rework has been done. The checking logic is now moved to framebuffer_check() so it is common to all drivers. But the common part is not good for komeda, so this series is not good for merging yet. I kindly ask for feedback whether the changes are in the right direction. I also kindly ask for input on how to accommodate komeda.
The CONFIG_DRM_AFBC option has been eliminated in favour of adding drm_afbc.c to drm_kms_helper.
v1..v2:
- addressed comments from Daniel Stone, Ayan Halder, Mihail Atanassov - coding style fixes
Andrzej Pietrasiewicz (6): drm/core: Allow drivers allocate a subclass of struct drm_framebuffer drm/core: Add drm_afbc_framebuffer and a corresponding helper drm/arm/malidp: Factor-in framebuffer creation drm/arm/malidp: Allocate an afbc-specific drm_framebuffer drm/arm/malidp: Switch to afbc helpers drm/rockchip: Add support for afbc
drivers/gpu/drm/arm/malidp_drv.c | 150 ++++++--------- drivers/gpu/drm/drm_gem_framebuffer_helper.c | 186 +++++++++++++++++-- drivers/gpu/drm/rockchip/rockchip_drm_drv.h | 1 + drivers/gpu/drm/rockchip/rockchip_drm_fb.c | 32 +++- drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 136 +++++++++++++- drivers/gpu/drm/rockchip/rockchip_drm_vop.h | 12 ++ drivers/gpu/drm/rockchip/rockchip_vop_reg.c | 83 ++++++++- include/drm/drm_framebuffer.h | 45 +++++ include/drm/drm_gem_framebuffer_helper.h | 16 ++ 9 files changed, 548 insertions(+), 113 deletions(-)