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drm/tegra: hdmi - Use proper power-up sequence

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This reflects the power-up sequence as described in the documentation,
but it doesn't seem to be strictly necessary to get HDMI to work.

Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding 2014-04-16 10:46:24 +02:00
parent d06e7f8f66
commit 8c8282c04d
1 changed files with 11 additions and 0 deletions
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11
drivers/gpu/drm/tegra/hdmi.c
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@ -737,6 +737,17 @@ static int tegra_output_hdmi_enable(struct tegra_output *output)
usleep_range(1000, 2000);
reset_control_deassert(hdmi->rst);
/* power up sequence */
value = tegra_hdmi_readl(hdmi, HDMI_NV_PDISP_SOR_PLL0);
value &= ~SOR_PLL_PDBG;
tegra_hdmi_writel(hdmi, value, HDMI_NV_PDISP_SOR_PLL0);
usleep_range(10, 20);
value = tegra_hdmi_readl(hdmi, HDMI_NV_PDISP_SOR_PLL0);
value &= ~SOR_PLL_PWR;
tegra_hdmi_writel(hdmi, value, HDMI_NV_PDISP_SOR_PLL0);
tegra_dc_writel(dc, VSYNC_H_POSITION(1),
DC_DISP_DISP_TIMING_OPTIONS);
tegra_dc_writel(dc, DITHER_CONTROL_DISABLE | BASE_COLOR_SIZE888,