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

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

Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding 2014-11-24 16:29:40 +01:00
parent 9c0b4ca112
commit 92f0e073ed
1 changed files with 25 additions and 0 deletions
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25
drivers/gpu/drm/tegra/dsi.c
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@ -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;