[PATCH 0/2] drm: CMA fbdev stride adjustment
daniel at ffwll.ch
Wed Aug 12 23:58:49 PDT 2015
On Wed, Aug 12, 2015 at 03:52:12PM -0500, Rob Herring wrote:
> I'm working on a DRM driver for PXA1928. Other than a stride alignment
> requirement of 16 bytes, I have no other reason not to use fbdev_cma.
> While I can adjust the stride for drm_gem_cma_dumb_create, I cannot do
> the same for drm_fbdev_cma_create without duplicating a bunch of code.
> This series allows fbdev_cma users to override the fb_probe function, so
> the stride can be adjusted.
> It appears to me that rcar-du has a bug that it doesn't handle alignment
> requirements for this case as well. Probably just getting lucky with
> tested resolutions/bpp.
> Also, AFAICT the Rockchip driver has no real reason to use a custom GEM
> allocator instead of the CMA one. It sets the DMA_ATTR_NO_KERNEL_MAPPING
> DMA attr, but that could easily be supported by the CMA allocator.
I think it'd be easier to review this with the driver at hand. That's also
generally the requirement for merging new code - it needs an in-kernel
> Rob Herring (2):
> drm/cma: allow custom fb helper functions
> drm/cma: allow adjusting the pitch for CMA fbdev
> drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c | 2 +-
> drivers/gpu/drm/drm_fb_cma_helper.c | 13 ++++++++++---
> drivers/gpu/drm/imx/imx-drm-core.c | 2 +-
> drivers/gpu/drm/rcar-du/rcar_du_kms.c | 3 ++-
> drivers/gpu/drm/sti/sti_drm_drv.c | 2 +-
> drivers/gpu/drm/tilcdc/tilcdc_drv.c | 2 +-
> include/drm/drm_fb_cma_helper.h | 7 +++++++
> include/drm/drm_fb_helper.h | 1 +
> 8 files changed, 24 insertions(+), 8 deletions(-)
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Software Engineer, Intel Corporation
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