drm/tegra: Split DC_CMD_STATE_CONTROL register write
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>
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@ -689,9 +689,10 @@ static void tegra_crtc_commit(struct drm_crtc *crtc)
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struct tegra_dc *dc = to_tegra_dc(crtc);
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unsigned long value;
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value = GENERAL_ACT_REQ | WIN_A_ACT_REQ |
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GENERAL_UPDATE | WIN_A_UPDATE;
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value = GENERAL_UPDATE | WIN_A_UPDATE;
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tegra_dc_writel(dc, value, DC_CMD_STATE_CONTROL);
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value = GENERAL_ACT_REQ | WIN_A_ACT_REQ;
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tegra_dc_writel(dc, value, DC_CMD_STATE_CONTROL);
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drm_vblank_post_modeset(crtc->dev, dc->pipe);
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