On Sat, 17 Feb 2024 at 17:03, Johan Hovold johan+linaro@kernel.org wrote:
Due to a long-standing issue in driver core, drivers may not probe defer after having registered child devices to avoid triggering a probe deferral loop (see fbc35b45f9f6 ("Add documentation on meaning of -EPROBE_DEFER")).
This could potentially also trigger a bug in the DRM bridge implementation which does not expect bridges to go away even if device links may avoid triggering this (when enabled).
Move registration of the DRM aux bridge to after looking up clocks and other resources.
Note that PHY creation can in theory also trigger a probe deferral when a 'phy' supply is used. This does not seem to affect the QMP PHY driver but the PHY subsystem should be reworked to address this (i.e. by separating initialisation and registration of the PHY).
Fixes: 35921910bbd0 ("phy: qcom: qmp-combo: switch to DRM_AUX_BRIDGE") Fixes: 1904c3f578dc ("phy: qcom-qmp-combo: Introduce drm_bridge") Cc: stable@vger.kernel.org # 6.5 Cc: Bjorn Andersson quic_bjorande@quicinc.com Cc: Dmitry Baryshkov dmitry.baryshkov@linaro.org Signed-off-by: Johan Hovold johan+linaro@kernel.org
drivers/phy/qualcomm/phy-qcom-qmp-combo.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
Reviewed-by: Dmitry Baryshkov dmitry.baryshkov@linaro.org