[PATCH 6.6 087/143] soc: qcom: pmic_glink: Fix boot when QRTR=m

Greg Kroah-Hartman
2024-03-04T21:39:44Z

From: Rob Clark <robdclark@chromium.org>

commit f79ee78767ca60e7a2c89eacd2dbdf237d97e838 upstream.

We need to bail out before adding/removing devices if we are going to
-EPROBE_DEFER. Otherwise boot can get stuck in a probe deferral loop due
to a long-standing issue in driver core (see commit fbc35b45f9f6 ("Add
documentation on meaning of -EPROBE_DEFER")).

Deregistering the altmode child device can potentially also trigger bugs
in the DRM bridge implementation, which does not expect bridges to go
away.

[DB: slightly fixed commit message by adding the word 'commit']
Suggested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Rob Clark <robdclark@chromium.org>
Link: https://lore.kernel.org/r/20231213210644.8702-1-robdclark@gmail.com
[ johan: rebase on 6.8-rc4, amend commit message and mention DRM ]
Fixes: 58ef4ece1e41 ("soc: qcom: pmic_glink: Introduce base PMIC GLINK driver")
Cc: <stable@vger.kernel.org> # 6.3
Cc: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240217150228.5788-5-johan+linaro@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/soc/qcom/pmic_glink.c | 21 +++++++++++----------
1 file changed, 11 insertions(+), 10 deletions(-)

--- a/drivers/soc/qcom/pmic_glink.c
+++ b/drivers/soc/qcom/pmic_glink.c
@@ -268,10 +268,17 @@ static int pmic_glink_probe(struct platf
else
pg->client_mask = PMIC_GLINK_CLIENT_DEFAULT;

+ pg->pdr = pdr_handle_alloc(pmic_glink_pdr_callback, pg);
+ if (IS_ERR(pg->pdr)) {
+ ret = dev_err_probe(&pdev->dev, PTR_ERR(pg->pdr),
+ "failed to initialize pdr\n");
+ return ret;
+ }
+
if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_UCSI)) {
ret = pmic_glink_add_aux_device(pg, &pg->ucsi_aux, "ucsi");
if (ret)
- return ret;
+ goto out_release_pdr_handle;
}
if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_ALTMODE)) {
ret = pmic_glink_add_aux_device(pg, &pg->altmode_aux, "altmode");
@@ -284,17 +291,11 @@ static int pmic_glink_probe(struct platf
goto out_release_altmode_aux;
}

- pg->pdr = pdr_handle_alloc(pmic_glink_pdr_callback, pg);
- if (IS_ERR(pg->pdr)) {
- ret = dev_err_probe(&pdev->dev, PTR_ERR(pg->pdr), "failed to initialize pdr\n");
- goto out_release_aux_devices;
- }
-
service = pdr_add_lookup(pg->pdr, "tms/servreg", "msm/adsp/charger_pd");
if (IS_ERR(service)) {
ret = dev_err_probe(&pdev->dev, PTR_ERR(service),
"failed adding pdr lookup for charger_pd\n");
- goto out_release_pdr_handle;
+ goto out_release_aux_devices;
}

mutex_lock(&__pmic_glink_lock);
@@ -303,8 +304,6 @@ static int pmic_glink_probe(struct platf

return 0;

-out_release_pdr_handle:
- pdr_handle_release(pg->pdr);
out_release_aux_devices:
if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_BATT))
pmic_glink_del_aux_device(pg, &pg->ps_aux);
@@ -314,6 +313,8 @@ out_release_altmode_aux:
out_release_ucsi_aux:
if (pg->client_mask & BIT(PMIC_GLINK_CLIENT_UCSI))
pmic_glink_del_aux_device(pg, &pg->ucsi_aux);
+out_release_pdr_handle:
+ pdr_handle_release(pg->pdr);

return ret;
}