From: Thierry Reding treding@nvidia.com

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 --- drivers/gpu/drm/tegra/output.c | 16 ++++++++++++++++ drivers/gpu/drm/tegra/sor.c | 17 +++++++++++++++++ 2 files changed, 33 insertions(+)

diff --git a/drivers/gpu/drm/tegra/output.c b/drivers/gpu/drm/tegra/output.c index 34373734ff68..57203030dd02 100644 --- a/drivers/gpu/drm/tegra/output.c +++ b/drivers/gpu/drm/tegra/output.c @@ -250,3 +250,19 @@ void tegra_output_find_possible_crtcs(struct tegra_output *output,

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; +} diff --git a/drivers/gpu/drm/tegra/sor.c b/drivers/gpu/drm/tegra/sor.c index 200d99e17afe..572e18545505 100644 --- a/drivers/gpu/drm/tegra/sor.c +++ b/drivers/gpu/drm/tegra/sor.c @@ -3995,9 +3995,16 @@ static int tegra_sor_suspend(struct device *dev) struct tegra_sor *sor = dev_get_drvdata(dev); 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) { err = regulator_disable(sor->hdmi_supply); if (err < 0) { + tegra_output_resume(&sor->output); return err; } } @@ -4016,6 +4023,16 @@ static int tegra_sor_resume(struct device *dev) 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; }