Benjamin Gaignard <benjamin.gaign...@linaro.org> writes: > 2017-07-10 12:53 GMT+02:00 Noralf Trønnes <nor...@tronnes.org>: >> Hi >> >> DRM_STM is 'default y' on ARCH_MULTIPLATFORM and it selects >> FB_PROVIDE_GET_FB_UNMAPPED_AREA. This breaks fbdev mmap for me on >> Raspberry Pi. mmap returns -ENOMEM. >> >> Disabling DRM_STM gives me working mmap. >> >> Noralf. >> >> >> config DRM_STM >> tristate "DRM Support for STMicroelectronics SoC Series" >> depends on DRM && (ARCH_STM32 || ARCH_MULTIPLATFORM) >> select DRM_KMS_HELPER >> select DRM_GEM_CMA_HELPER >> select DRM_KMS_CMA_HELPER >> select DRM_PANEL >> select VIDEOMODE_HELPERS >> select FB_PROVIDE_GET_FB_UNMAPPED_AREA > > I think to two solutions: > - add "if !MMU" after FB_PROVIDE_GET_FB_UNMAPPED_AREA in this Kconfig > but other drivers could do the same.
> - add !MMU when FB_PROVIDE_GET_FB_UNMAPPED_AREA is used in fbmen.c This is the most important fix, regardless of whether the driver is default y or not. The unmapped area helper getting filled in on MMU platforms definitely breaks mmap.
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