Merge pull request #5157 from HiassofT/le10-kodi-gbm-mode

kodi: add patch to fix gbm default resolution handling

packages/mediacenter/kodi/patches/kodi-995.20-gbm-default-to-original-crtc-mode.patch

@@ -0,0 +1,70 @@
+From bdd6c0e14d52f1ec8dac34c1dee9a636fd5cd1e8 Mon Sep 17 00:00:00 2001
+From: Matthias Reichl <hias@horus.com>
+Date: Wed, 17 Feb 2021 22:14:15 +0100
+Subject: [PATCH] windowing/gbm/drm: default to original crtc mode
+
+This brings RES_DESKTOP handling of gbm in line with other windowing
+systems.
+
+If the framebuffer has been set up with a valid mode before kodi
+startup then use that as the default / DESKTOP mode, otherwise fall
+back to the previous behaviour of setting DESKTOP to the preferred
+mode reported by drm.
+
+This avoids unnecessary mode switches at kodi startup (which usually
+lead to screen blanking for a short time) and allows users to easily
+override broken video/edid/... setups by manually configuring a mode
+in linux which then kodi uses too. That is especially important when
+running kodi for the first time, if it switches to a different mode
+that might not be working with the user's monitor the result is a
+black screen with no easy possibility to fix the settings.
+
+Signed-off-by: Matthias Reichl <hias@horus.com>
+---
+ xbmc/windowing/gbm/drm/DRMCrtc.h    |  1 +
+ xbmc/windowing/gbm/drm/DRMUtils.cpp | 10 ++++++++++
+ 2 files changed, 11 insertions(+)
+
+diff --git a/xbmc/windowing/gbm/drm/DRMCrtc.h b/xbmc/windowing/gbm/drm/DRMCrtc.h
+index 15d7f8faf6..a1aadc2fad 100644
+--- a/xbmc/windowing/gbm/drm/DRMCrtc.h
++++ b/xbmc/windowing/gbm/drm/DRMCrtc.h
+@@ -30,6 +30,7 @@ public:
+   uint32_t GetX() const { return m_crtc->x; }
+   uint32_t GetY() const { return m_crtc->y; }
+   drmModeModeInfoPtr GetMode() const { return &m_crtc->mode; }
++  bool GetModeValid() const { return m_crtc->mode_valid != 0; }
+ 
+ private:
+   struct DrmModeCrtcDeleter
+diff --git a/xbmc/windowing/gbm/drm/DRMUtils.cpp b/xbmc/windowing/gbm/drm/DRMUtils.cpp
+index 5593ce086b..85fc266fd2 100644
+--- a/xbmc/windowing/gbm/drm/DRMUtils.cpp
++++ b/xbmc/windowing/gbm/drm/DRMUtils.cpp
+@@ -144,6 +144,9 @@ drm_fb * CDRMUtils::DrmFbGetFromBo(struct gbm_bo *bo)
+ 
+ bool CDRMUtils::FindPreferredMode()
+ {
++  if (m_mode)
++    return true;
++
+   for (int i = 0, area = 0; i < m_connector->GetModesCount(); i++)
+   {
+     drmModeModeInfo* current_mode = m_connector->GetModeForIndex(i);
+@@ -534,6 +537,13 @@ bool CDRMUtils::FindCrtc()
+       if (m_crtcs[i]->GetCrtcId() == m_encoder->GetCrtcId())
+       {
+         m_orig_crtc = m_crtcs[i].get();
++        if (m_orig_crtc->GetModeValid())
++        {
++          m_mode = m_orig_crtc->GetMode();
++          CLog::Log(LOGDEBUG, "CDRMUtils::{} - original crtc mode: {}x{}{} @ {} Hz", __FUNCTION__,
++                    m_mode->hdisplay, m_mode->vdisplay,
++                    m_mode->flags & DRM_MODE_FLAG_INTERLACE ? "i" : "", m_mode->vrefresh);
++        }
+         return true;
+       }
+     }
+-- 
+2.20.1
+