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drm/tegra: Split DC_CMD_STATE_CONTROL register write

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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>
This commit is contained in:
Thierry Reding 2013-01-15 12:21:36 +01:00
parent 3c03c46ac8
commit 3b9e71eae5
1 changed files with 3 additions and 2 deletions
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5
drivers/gpu/drm/tegra/dc.c
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@ -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);