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Commit 92f0e073 authored by Thierry Reding's avatar Thierry Reding
Browse files

drm/tegra: dsi: Soft-reset controller on ->disable 



This reset is necessary to properly clean up the internal state of the
controller.

Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent 9c0b4ca1

drivers/gpu/drm/tegra/dsi.c

+25 −0
Original line number Diff line number Diff line
@@ -724,6 +724,30 @@ static void tegra_dsi_disable(struct tegra_dsi *dsi) 
	usleep_range(5000, 10000);

}



static void tegra_dsi_soft_reset(struct tegra_dsi *dsi)

{

	u32 value;



	value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);

	value &= ~DSI_POWER_CONTROL_ENABLE;

	tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);



	usleep_range(300, 1000);



	value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);

	value |= DSI_POWER_CONTROL_ENABLE;

	tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);



	usleep_range(300, 1000);



	value = tegra_dsi_readl(dsi, DSI_TRIGGER);

	if (value)

		tegra_dsi_writel(dsi, 0, DSI_TRIGGER);



	if (dsi->slave)

		tegra_dsi_soft_reset(dsi->slave);

}



static int tegra_output_dsi_disable(struct tegra_output *output)

{

	struct tegra_dc *dc = to_tegra_dc(output->encoder.crtc);
@@ -762,6 +786,7 @@ static int tegra_output_dsi_disable(struct tegra_output *output) 
	if (err < 0)

		dev_dbg(dsi->dev, "failed to idle DSI: %d\n", err);



	tegra_dsi_soft_reset(dsi);

	tegra_dsi_disable(dsi);



	dsi->enabled = false;