Hi, Am Freitag, 9. Januar 2026, 02:26:00 Mitteleuropäische Normalzeit schrieb Chaoyi Chen: > On 1/9/2026 3:03 AM, Heiko Stuebner wrote: > > Am Donnerstag, 6. November 2025, 03:06:31 Mitteleuropäische Normalzeit > > schrieb Chaoyi Chen: > >> From: Chaoyi Chen <[email protected]> > >> > >> On the RK3506 platform, there is no iommu hardware. And even on > >> platform that have iommu hardware, it should be possible to use > >> VOP without enabling iommu. In this case, a contiguous memory > >> space like CMA should be used. > >> > >> So this patch removes the dependency on ROCKCHIP_IOMMU. > >> > >> Signed-off-by: Chaoyi Chen <[email protected]> > >> --- > >> drivers/gpu/drm/rockchip/Kconfig | 3 ++- > >> 1 file changed, 2 insertions(+), 1 deletion(-) > >> > >> diff --git a/drivers/gpu/drm/rockchip/Kconfig > >> b/drivers/gpu/drm/rockchip/Kconfig > >> index b7b025814e72..a056d419190c 100644 > >> --- a/drivers/gpu/drm/rockchip/Kconfig > >> +++ b/drivers/gpu/drm/rockchip/Kconfig > >> @@ -1,7 +1,8 @@ > >> # SPDX-License-Identifier: GPL-2.0-only > >> config DRM_ROCKCHIP > >> tristate "DRM Support for Rockchip" > >> - depends on DRM && ROCKCHIP_IOMMU > >> + depends on DRM > >> + depends on ROCKCHIP_IOMMU || !ROCKCHIP_IOMMU > > > > I don't really understand this yes+no line :-) > > > > Can't you just > > - drop the dependency altogether > > or > > - do a depends on ROCKCHIP_IOMMU if ARM64 > > > > > > This trick is called optional-dependencies [0]. In addition to the > familiar depends on ROCKCHIP_IOMMU part, the newly added !ROCKCHIP_IOMMU > ensures that DRM_ROCKCHIP can still be built even when ROCKCHIP_IOMMU > is not build. > > [0]: > https://docs.kernel.org/kbuild/kconfig-language.html#optional-dependencies
thanks a lot for pointing me to this nifty feature :-) Heiko
