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drm/tegra: dsi: Reset across ->exit()/->init() 

This allows a DRM driver unload/reload cycle to completely reset the DSI
controller and may help in situations where it's broken.

Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding 2014-11-24 16:31:48 +01:00
parent 92f0e073ed
commit 201106d83e
1 changed files with 14 additions and 13 deletions
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27
drivers/gpu/drm/tegra/dsi.c
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@ -948,6 +948,14 @@ static int tegra_dsi_init(struct host1x_client *client)
struct tegra_dsi *dsi = host1x_client_to_dsi(client);
int err;
reset_control_deassert(dsi->rst);
err = tegra_dsi_pad_calibrate(dsi);
if (err < 0) {
dev_err(dsi->dev, "MIPI calibration failed: %d\n", err);
goto reset;
}
/* Gangsters must not register their own outputs. */
if (!dsi->master) {
dsi->output.type = TEGRA_OUTPUT_DSI;
@ -968,6 +976,10 @@ static int tegra_dsi_init(struct host1x_client *client)
}
return 0;
reset:
reset_control_assert(dsi->rst);
return err;
}
static int tegra_dsi_exit(struct host1x_client *client)
@ -997,6 +1009,8 @@ static int tegra_dsi_exit(struct host1x_client *client)
}
}
reset_control_assert(dsi->rst);
return 0;
}
@ -1423,13 +1437,6 @@ static int tegra_dsi_probe(struct platform_device *pdev)
if (IS_ERR(dsi->rst))
return PTR_ERR(dsi->rst);
err = reset_control_deassert(dsi->rst);
if (err < 0) {
dev_err(&pdev->dev, "failed to bring DSI out of reset: %d\n",
err);
return err;
}
dsi->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(dsi->clk)) {
dev_err(&pdev->dev, "cannot get DSI clock\n");
@ -1495,12 +1502,6 @@ static int tegra_dsi_probe(struct platform_device *pdev)
goto disable_vdd;
}
err = tegra_dsi_pad_calibrate(dsi);
if (err < 0) {
dev_err(dsi->dev, "MIPI calibration failed: %d\n", err);
goto mipi_free;
}
dsi->host.ops = &tegra_dsi_host_ops;
dsi->host.dev = &pdev->dev;