Currently, the vblank support is not correctly implemented in MXSFB_DRM
driver. The call to drm_vblank_init is made with mode_config.num_crtc
which at that time is 0. Because of this, vblank is not activated, so
there won't be any vblank event submitted.
For example, when running modetest with the '-v' parameter will result
in an astronomical refresh rate (10000+ Hz), because of that.
Signed-off-by: Robert Chiras <robert.chiras@xxxxxxx>
---
drivers/gpu/drm/mxsfb/mxsfb_drv.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
index 2743975..78a2382 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
@@ -38,6 +38,9 @@
#include "mxsfb_drv.h"
#include "mxsfb_regs.h"
+/* The eLCDIF max possible CRTCs */
+#define MAX_CRTCS 1
+
enum mxsfb_devtype {
MXSFB_V3,
MXSFB_V4,
@@ -138,6 +141,8 @@ static void mxsfb_pipe_enable(struct drm_simple_display_pipe *pipe,
mxsfb->connector = &mxsfb->panel_connector;
}
+ drm_crtc_vblank_on(&pipe->crtc);
+
pm_runtime_get_sync(drm->dev);
drm_panel_prepare(mxsfb->panel);
mxsfb_crtc_enable(mxsfb);
@@ -164,6 +169,8 @@ static void mxsfb_pipe_disable(struct drm_simple_display_pipe *pipe)
}
spin_unlock_irq(&drm->event_lock);
+ drm_crtc_vblank_off(&pipe->crtc);
+
if (mxsfb->connector != &mxsfb->panel_connector)
mxsfb->connector = NULL;
}
@@ -246,7 +253,7 @@ static int mxsfb_load(struct drm_device *drm, unsigned long flags)
pm_runtime_enable(drm->dev);
- ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
+ ret = drm_vblank_init(drm, MAX_CRTCS);
if (ret < 0) {
dev_err(drm->dev, "Failed to initialise vblank\n");
goto err_vblank;
--
2.7.4
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