On Tue, Feb 11, 2014 at 6:12 PM, Dmitry Osipenko <digetx@xxxxxxxxx> wrote:
> 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@xxxxxxxxx>
> ---
> drivers/gpu/drm/tegra/rgb.c | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
> diff --git a/drivers/gpu/drm/tegra/rgb.c b/drivers/gpu/drm/tegra/rgb.c
> index 338f7f6..0266fb4 100644
> --- a/drivers/gpu/drm/tegra/rgb.c
> +++ b/drivers/gpu/drm/tegra/rgb.c
> @@ -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;
> }
>
Wouldn't it make more sense to make "enabled" and int that counts how
many times tegra_output_rgb_enable has been called? That way you can
have tegra_output_rgb_disable only really disable the display once the
same amount of disables have been performed...
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