2017-07-10 12:53 GMT+02:00 Noralf Trønnes noralf@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
default y help Enable support for the on-chip display controller on STMicroelectronics STM32 MCUs. To compile this driver as a module, choose M here: the module will be called stm-drm.
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