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drm/tegra: Add guard to avoid double disable/enable of RGB outputs 

Add guard to check whether RGB output is already enabled in the way it's
done for HDMI output. Fixes possible hang on trying to disable output twice
(first time during driver probe and second on fb registering).

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Dmitry Osipenko 2014-02-11 21:12:27 +04:00 committed by Thierry Reding
parent 89e6e8c85f
commit b189153790
1 changed files with 11 additions and 0 deletions
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11
drivers/gpu/drm/tegra/rgb.c
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@ -15,6 +15,7 @@
struct tegra_rgb {
struct tegra_output output;
struct tegra_dc *dc;
bool enabled;
struct clk *clk_parent;
struct clk *clk;
@ -89,6 +90,9 @@ static int tegra_output_rgb_enable(struct tegra_output *output)
struct tegra_rgb *rgb = to_rgb(output);
unsigned long value;
if (rgb->enabled)
return 0;
tegra_dc_write_regs(rgb->dc, rgb_enable, ARRAY_SIZE(rgb_enable));
value = DE_SELECT_ACTIVE | DE_CONTROL_NORMAL;
@ -122,6 +126,8 @@ static int tegra_output_rgb_enable(struct tegra_output *output)
tegra_dc_writel(rgb->dc, GENERAL_ACT_REQ << 8, DC_CMD_STATE_CONTROL);
tegra_dc_writel(rgb->dc, GENERAL_ACT_REQ, DC_CMD_STATE_CONTROL);
rgb->enabled = true;
return 0;
}
@ -130,6 +136,9 @@ static int tegra_output_rgb_disable(struct tegra_output *output)
struct tegra_rgb *rgb = to_rgb(output);
unsigned long value;
if (!rgb->enabled)
return 0;
value = tegra_dc_readl(rgb->dc, DC_CMD_DISPLAY_POWER_CONTROL);
value &= ~(PW0_ENABLE | PW1_ENABLE | PW2_ENABLE | PW3_ENABLE |
PW4_ENABLE | PM0_ENABLE | PM1_ENABLE);
@ -144,6 +153,8 @@ static int tegra_output_rgb_disable(struct tegra_output *output)
tegra_dc_write_regs(rgb->dc, rgb_disable, ARRAY_SIZE(rgb_disable));
rgb->enabled = false;
return 0;
}