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Commit 334ae6b5 authored by Thierry Reding's avatar Thierry Reding
Browse files

drm/tegra: dsi - Add enable guard 



To prevent the enable or disable operations to potentially be run
multiple times, add guards to return early when the output is already
in the targetted state.

Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent 17297a28

drivers/gpu/drm/tegra/dsi.c

+11 −0
Original line number Diff line number Diff line
@@ -53,6 +53,7 @@ struct tegra_dsi { 
	struct mipi_dsi_host host;



	struct regulator *vdd;

	bool enabled;

};



static inline struct tegra_dsi *
@@ -436,6 +437,9 @@ static int tegra_output_dsi_enable(struct tegra_output *output) 
	const u32 *pkt_seq;

	int err;



	if (dsi->enabled)

		return 0;



	if (dsi->flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE) {

		DRM_DEBUG_KMS("Non-burst video mode with sync pulses\n");

		pkt_seq = pkt_seq_video_non_burst_sync_pulses;
@@ -530,6 +534,8 @@ static int tegra_output_dsi_enable(struct tegra_output *output) 
	value |= DSI_POWER_CONTROL_ENABLE;

	tegra_dsi_writel(dsi, value, DSI_POWER_CONTROL);



	dsi->enabled = true;



	return 0;

}
@@ -539,6 +545,9 @@ static int tegra_output_dsi_disable(struct tegra_output *output) 
	struct tegra_dsi *dsi = to_dsi(output);

	unsigned long value;



	if (!dsi->enabled)

		return 0;



	/* disable DSI controller */

	value = tegra_dsi_readl(dsi, DSI_POWER_CONTROL);

	value &= DSI_POWER_CONTROL_ENABLE;
@@ -568,6 +577,8 @@ static int tegra_output_dsi_disable(struct tegra_output *output) 


	clk_disable(dsi->clk);



	dsi->enabled = false;



	return 0;

}