The Tegra TRM says that the ACT_REQ and UPDATE fields cannot be programmed at the same time so they are updated in two consecutive writes instead.
Signed-off-by: Thierry Reding thierry.reding@avionic-design.de --- drivers/gpu/drm/tegra/dc.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c index c5d825f..2086400 100644 --- a/drivers/gpu/drm/tegra/dc.c +++ b/drivers/gpu/drm/tegra/dc.c @@ -689,9 +689,10 @@ static void tegra_crtc_commit(struct drm_crtc *crtc) struct tegra_dc *dc = to_tegra_dc(crtc); unsigned long value;
- value = GENERAL_ACT_REQ | WIN_A_ACT_REQ | - GENERAL_UPDATE | WIN_A_UPDATE; + value = GENERAL_UPDATE | WIN_A_UPDATE; + tegra_dc_writel(dc, value, DC_CMD_STATE_CONTROL);
+ value = GENERAL_ACT_REQ | WIN_A_ACT_REQ; tegra_dc_writel(dc, value, DC_CMD_STATE_CONTROL);
drm_vblank_post_modeset(crtc->dev, dc->pipe);