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drm/tegra: dsi - Add enable guard

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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: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding 2014-03-14 14:15:10 +01:00
parent 17297a2813
commit 334ae6b527
1 changed files with 11 additions and 0 deletions
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11
drivers/gpu/drm/tegra/dsi.c
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@ -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;
}