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drm/tegra: dpaux: Fix crash if VDD supply is absent

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In order to properly make the VDD supply optional, all accesses to the
regulator need to be ignored, because the regulator core doesn't treat
NULL special.

Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding 2019-06-24 13:30:24 +02:00
parent 245ce70cd4
commit 6c79f09fce
1 changed files with 14 additions and 8 deletions
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22
drivers/gpu/drm/tegra/dpaux.c
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@ -505,6 +505,8 @@ static int tegra_dpaux_probe(struct platform_device *pdev)
return PTR_ERR(dpaux->vdd);
}
dpaux->vdd = NULL;
}
platform_set_drvdata(pdev, dpaux);
@ -698,13 +700,15 @@ int drm_dp_aux_attach(struct drm_dp_aux *aux, struct tegra_output *output)
output->connector.polled = DRM_CONNECTOR_POLL_HPD;
dpaux->output = output;
err = regulator_enable(dpaux->vdd);
if (err < 0)
return err;
if (output->panel) {
enum drm_connector_status status;
if (dpaux->vdd) {
err = regulator_enable(dpaux->vdd);
if (err < 0)
return err;
}
timeout = jiffies + msecs_to_jiffies(250);
while (time_before(jiffies, timeout)) {
@ -732,13 +736,15 @@ int drm_dp_aux_detach(struct drm_dp_aux *aux)
disable_irq(dpaux->irq);
err = regulator_disable(dpaux->vdd);
if (err < 0)
return err;
if (dpaux->output->panel) {
enum drm_connector_status status;
if (dpaux->vdd) {
err = regulator_disable(dpaux->vdd);
if (err < 0)
return err;
}
timeout = jiffies + msecs_to_jiffies(250);
while (time_before(jiffies, timeout)) {