github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-26 08:02:27 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

phy: qcom-qmp-combo: fix drm bridge registration

Browse Source 
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 fbc35b45f9 ("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: 35921910bb ("phy: qcom: qmp-combo: switch to DRM_AUX_BRIDGE")
Fixes: 1904c3f578 ("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>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Acked-by: Vinod Koul <vkoul@kernel.org>
Acked-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20240217150228.5788-6-johan+linaro@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Johan Hovold 2024-02-17 16:02:27 +01:00 committed by Vinod Koul
parent 90d35da658
commit d2d7b8e880
1 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/phy/qualcomm/phy-qcom-qmp-combo.c
View File

@ -3566,10 +3566,6 @@ static int qmp_combo_probe(struct platform_device *pdev)
if (ret)
return ret;
ret = drm_aux_bridge_register(dev);
if (ret)
return ret;
/* Check for legacy binding with child nodes. */
usb_np = of_get_child_by_name(dev->of_node, "usb3-phy");
if (usb_np) {
@ -3589,6 +3585,10 @@ static int qmp_combo_probe(struct platform_device *pdev)
if (ret)
goto err_node_put;
ret = drm_aux_bridge_register(dev);
if (ret)
goto err_node_put;
pm_runtime_set_active(dev);
ret = devm_pm_runtime_enable(dev);
if (ret)