diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0519-drm-vc4-Enable-Disable-vblanks-properly-in-crtc-en-d.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0519-drm-vc4-Enable-Disable-vblanks-properly-in-crtc-en-d.patch | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0519-drm-vc4-Enable-Disable-vblanks-properly-in-crtc-en-d.patch b/target/linux/brcm2708/patches-4.4/0519-drm-vc4-Enable-Disable-vblanks-properly-in-crtc-en-d.patch new file mode 100644 index 0000000000..4039a369fa --- /dev/null +++ b/target/linux/brcm2708/patches-4.4/0519-drm-vc4-Enable-Disable-vblanks-properly-in-crtc-en-d.patch @@ -0,0 +1,38 @@ +From c4bd9665b145cacfdf9cbd5f3d83ed0961080236 Mon Sep 17 00:00:00 2001 +From: Mario Kleiner <mario.kleiner.de@gmail.com> +Date: Tue, 19 Jul 2016 20:59:01 +0200 +Subject: [PATCH] drm/vc4: Enable/Disable vblanks properly in crtc en/disable. + +Add missing drm_crtc_vblank_on/off() calls so vblank irq +handling/updating/timestamping never runs with a crtc shut down +or during its shutdown/startup, as that causes large jumps in +vblank count and trouble for compositors. + +Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com> +Signed-off-by: Eric Anholt <eric@anholt.net> +--- + drivers/gpu/drm/vc4/vc4_crtc.c | 6 ++++++ + 1 file changed, 6 insertions(+) + +--- a/drivers/gpu/drm/vc4/vc4_crtc.c ++++ b/drivers/gpu/drm/vc4/vc4_crtc.c +@@ -468,6 +468,9 @@ static void vc4_crtc_disable(struct drm_ + int ret; + require_hvs_enabled(dev); + ++ /* Disable vblank irq handling before crtc is disabled. */ ++ drm_crtc_vblank_off(crtc); ++ + if (VC4_DSI_USE_FIRMWARE_SETUP && + (CRTC_READ(PV_V_CONTROL) & PV_VCONTROL_DSI)) { + /* Skip disabling the PV/HVS for the channel if it was +@@ -531,6 +534,9 @@ static void vc4_crtc_enable(struct drm_c + /* Turn on the pixel valve, which will emit the vstart signal. */ + CRTC_WRITE(PV_V_CONTROL, + CRTC_READ(PV_V_CONTROL) | PV_VCONTROL_VIDEN); ++ ++ /* Enable vblank irq handling after crtc is started. */ ++ drm_crtc_vblank_on(crtc); + } + + static bool vc4_crtc_mode_fixup(struct drm_crtc *crtc, |