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When user enabled HDCP feature, userspace will set HDCP content to DRM_MODE_CONTENT_PROTECTION_DESIRED. Next, anx7625 will update HDCP content to DRM_MODE_CONTENT_PROTECTION_ENABLED if down stream support HDCP feature. As anx7625 bridge IC will be power down after call .atomic_disable(), then all HDCP status will be lost on chip. So we should reestablish HDCP again in .atomic_enable(), and update hdcp content to DESIRE if current HDCP content is ENABLE in .atomic_disable(). v4: - Change HDCP content value to DESIRED if HDCP status is ENABLE in bridge interface .atomic_enable(). v3: - Move hdcp content value checking from bridge interface .atomic_check() to .atomic_enable() v2: - Add more details in commit message Signed-off-by: Xin Ji <xji@analogixsemi.com> Tested-by: Pin-yen Lin <treapking@chromium.org> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Link: https://lore.kernel.org/r/20241219070330.224996-1-xji@analogixsemi.com Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org> Link: https://patchwork.freedesktop.org/patch/msgid/20241219070330.224996-1-xji@analogixsemi.com