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drm/tegra: output: Implement system suspend/resume 

Implement generic system suspend/resume functions that can be used with
any output type. Currently this only implements disabling and enabling
of the IRQ functionality across system suspend/resume. This prevents an
interrupt from happening before the display driver has fully resumed.

Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding 2019-12-03 17:29:57 +01:00
parent f90965abc5
commit 271502efbd
2 changed files with 33 additions and 0 deletions
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16
drivers/gpu/drm/tegra/output.c
View File

@ -250,3 +250,19 @@ void tegra_output_find_possible_crtcs(struct tegra_output *output,
output->encoder.possible_crtcs = mask; output->encoder.possible_crtcs = mask;
} }
int tegra_output_suspend(struct tegra_output *output)
{
if (output->hpd_irq)
disable_irq(output->hpd_irq);
return 0;
}
int tegra_output_resume(struct tegra_output *output)
{
if (output->hpd_irq)
enable_irq(output->hpd_irq);
return 0;
}

17
drivers/gpu/drm/tegra/sor.c
View File

@ -3995,9 +3995,16 @@ static int __maybe_unused tegra_sor_suspend(struct device *dev)
struct tegra_sor *sor = dev_get_drvdata(dev); struct tegra_sor *sor = dev_get_drvdata(dev);
int err; int err;
err = tegra_output_suspend(&sor->output);
if (err < 0) {
dev_err(dev, "failed to suspend output: %d\n", err);
return err;
}
if (sor->hdmi_supply) { if (sor->hdmi_supply) {
err = regulator_disable(sor->hdmi_supply); err = regulator_disable(sor->hdmi_supply);
if (err < 0) { if (err < 0) {
tegra_output_resume(&sor->output);
return err; return err;
} }
} }
@ -4016,6 +4023,16 @@ static int __maybe_unused tegra_sor_resume(struct device *dev)
return err; return err;
} }
err = tegra_output_resume(&sor->output);
if (err < 0) {
dev_err(dev, "failed to resume output: %d\n", err);
if (sor->hdmi_supply)
regulator_disable(sor->hdmi_supply);
return err;
}
return 0; return 0;
} }