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drm/vc4: hdmi: Switch to pm_runtime_status_suspended

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If the controller isn't clocked or its domain powered up, the register
accesses will either stall the CPU or return garbage, respectively.

Thus, we had a warning in our register access function to complain when
that kind of risky accesses were performed.

In order to check the runtime_pm power state, we were using
pm_runtime_active(), but it turns out that it will become active only
once the runtime_resume hook has been executed.

This prevents us from doing any WARN-free register access in our
runtime_resume() implementation, while this is valid.

Let's switch to pm_runtime_status_suspended() instead.

Fixes: 14e193b956 ("drm/vc4: hdmi: Warn if we access the controller while disabled")
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Link: https://lore.kernel.org/r/20220613144800.326124-23-maxime@cerno.tech
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
This commit is contained in:
Dave Stevenson 2022-06-13 16:47:49 +02:00 committed by Maxime Ripard
parent 35dc00c12a
commit fcef97e700
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1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/vc4/vc4_hdmi_regs.h
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@ -423,7 +423,7 @@ static inline u32 vc4_hdmi_read(struct vc4_hdmi *hdmi,
const struct vc4_hdmi_variant *variant = hdmi->variant;
void __iomem *base;
WARN_ON(!pm_runtime_active(&hdmi->pdev->dev));
WARN_ON(pm_runtime_status_suspended(&hdmi->pdev->dev));
if (reg >= variant->num_registers) {
dev_warn(&hdmi->pdev->dev,
@ -453,7 +453,7 @@ static inline void vc4_hdmi_write(struct vc4_hdmi *hdmi,
lockdep_assert_held(&hdmi->hw_lock);
WARN_ON(!pm_runtime_active(&hdmi->pdev->dev));
WARN_ON(pm_runtime_status_suspended(&hdmi->pdev->dev));
if (reg >= variant->num_registers) {
dev_warn(&hdmi->pdev->dev,