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Commit 8c8282c0 authored by Thierry Reding's avatar Thierry Reding
Browse files

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



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: default avatarThierry Reding <treding@nvidia.com>
parent d06e7f8f

drivers/gpu/drm/tegra/hdmi.c

+11 −0
Original line number Diff line number Diff line
@@ -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,