From fbd80b2c8ebe9fd41229dc5438524d107c071ff1 Mon Sep 17 00:00:00 2001 From: Dawid Kurek Date: Thu, 6 Jul 2017 14:51:11 +0200 Subject: [PATCH] modesetting: Blacklist EVDI devices from PRIME sync UDL (usb) devices are blacklisted because of they weird behaviour when it comes to vblank events. As EVDI uses very similar model of handling vblanks it should be treated similarly. When doing a page flip, EVDI does not wait for real vblank, but simulates it by adding constant delay. It also does not support DRM_IOCTL_WAIT_VBLANK. In contrast to UDL, EVDI uses platform devices, thus instead of 'usb' in path they all have 'platform'. It is possible to blacklist by 'platform', so without explicitly saying 'evdi', but it might be misleading when it comes to real reason for it. Signed-off-by: Dawid Kurek --- hw/xfree86/drivers/modesetting/driver.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/hw/xfree86/drivers/modesetting/driver.c b/hw/xfree86/drivers/modesetting/driver.c index 32619edab..9afb344c8 100644 --- a/hw/xfree86/drivers/modesetting/driver.c +++ b/hw/xfree86/drivers/modesetting/driver.c @@ -1197,6 +1197,11 @@ msEnableSharedPixmapFlipping(RRCrtcPtr crtc, PixmapPtr front, PixmapPtr back) * vblank events */ if (syspath && strstr(syspath, "usb")) return FALSE; + + /* EVDI uses USB transport but is platform device, not usb. + * Blacklist it explicitly */ + if (syspath && strstr(syspath, "evdi")) + return FALSE; } #endif