kc3-lang/SDL/src/video/kmsdrm_legacy/SDL_kmsdrm_legacy_events.c

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• Hash : f8839289
  Author :
  Date : 2020-12-15T12:22:48
  

  Potential fix for bug 5393 - KMSDRM: using atomic mode setting breaks GPU compatibility Substring I was trying the KMSDRM video backend with some very simple programs that were working ok on 2.0.12. The same code won?t work on the current dev branch and I get: DEBUG: check_modesetting: probing ?/dev/dri/card0? DEBUG: /dev/dri/card0 connector, encoder and CRTC counts are: 4 5 6 DEBUG: check_modesetting: probing ?/dev/dri/card0? DEBUG: /dev/dri/card0 connector, encoder and CRTC counts are: 4 5 6 DEBUG: KMSDRM_VideoInit() DEBUG: Opening device /dev/dri/card0 DEBUG: Opened DRM FD (3) DEBUG: no atomic modesetting support. DEBUG: Video subsystem has not been initialized INFO: Using SDL video driver: (null) DEBUG: Video subsystem has not been initialized After carefully checking, the radeon driver doesn?t support atomic modesetting. That?s not the only problem : the same happens with the amdgpu driver if we disable Display Core (kernel parameter amdgpu.dc=0, which is required to get analogue outputs working). This is a major regression in the KMSDRM driver. Using atomic mode setting is great, but having no fallback to the "standard KMS" is bad.

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• src/video/kmsdrm_legacy/SDL_kmsdrm_legacy_events.c

• /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
  
    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.
  
    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely, subject to the following restrictions:
  
    1. The origin of this software must not be misrepresented; you must not
       claim that you wrote the original software. If you use this software
       in a product, an acknowledgment in the product documentation would be
       appreciated but is not required.
    2. Altered source versions must be plainly marked as such, and must not be
       misrepresented as being the original software.
    3. This notice may not be removed or altered from any source distribution.
  */
  
  #include "../../SDL_internal.h"
  
  #if SDL_VIDEO_DRIVER_KMSDRM
  
  #include "SDL_kmsdrm_legacy_video.h"
  #include "SDL_kmsdrm_legacy_events.h"
  
  #ifdef SDL_INPUT_LINUXEV
  #include "../../core/linux/SDL_evdev.h"
  #endif
  
  void KMSDRM_LEGACY_PumpEvents(_THIS)
  {
  #ifdef SDL_INPUT_LINUXEV
      SDL_EVDEV_Poll();
  #endif
  
  }
  
  #endif /* SDL_VIDEO_DRIVER_KMSDRM */
  
  

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