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Tue, 23 Apr 2024 19:16:59 -0700 (PDT) Received: from umbar.lan ([192.130.178.91]) by smtp.gmail.com with ESMTPSA id o2-20020ac24c42000000b00518e96b85b0sm2144108lfk.234.2024.04.23.19.16.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 23 Apr 2024 19:16:59 -0700 (PDT) From: Dmitry Baryshkov Date: Wed, 24 Apr 2024 05:16:57 +0300 Subject: [PATCH v4] usb: typec: qcom-pmic-typec: split HPD bridge alloc and registration Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20240424-qc-pmic-typec-hpd-split-v4-1-f7e10d147443@linaro.org> X-B4-Tracking: v=1; b=H4sIAJhrKGYC/4XNwQrCMAzG8VeRno00Sd3Uk+8hHrqucwHdajuGQ /buVk+KiMf/B/nlrpKP4pPaLe4q+lGS9F0Os1wo19ru5EHq3Io0GW30Gq4OwkUcDFPwDtpQQwp nGYBoow1p3GqqVL4O0Tdye8mHY+5W0tDH6fVoxOf63xwRELjg2tqmYsfF/iydjf2qjyf1REd6h za/IcoQlto0ayasSv6C+A3C4jfEGWpqXaJn3KLFD2ie5wdGsPJ/UQEAAA== To: Bryan O'Donoghue , Heikki Krogerus , Bjorn Andersson , Konrad Dybcio , Greg Kroah-Hartman Cc: Johan Hovold , linux-arm-msm@vger.kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Caleb Connolly X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=3381; i=dmitry.baryshkov@linaro.org; h=from:subject:message-id; bh=z0tyvXJLTPOxib1CjXH35jFEgsUkKqgQu3u4d6x+zAU=; b=owEBbQGS/pANAwAKAYs8ij4CKSjVAcsmYgBmKGua8A+E5KBZPeNOQXcA2mDi6X8c57wKq09sY wf30OEtAHWJATMEAAEKAB0WIQRMcISVXLJjVvC4lX+LPIo+Aiko1QUCZihrmgAKCRCLPIo+Aiko 1c9LB/wM2jWAszFbtPuorq1W61uTjm6LJWhzKlr/hwmDcqRGuBIakSHyheyNlJ3qKncxWWTjULp akn89vD6sx8RTTM1XS6LVDGX2BpEcZBZBNqXH6kUFX8R2+IirtvLE5Ic6Dtwl6W8zLvFAN3tzQP JXGynrrn5RfGvECNrP7i7hNkSv+8K/L/yLksH7fGiIHrr0zMIbTtl8p83lxi/NjpyxyV5Zly/PD Nb1BhF7YvzIDAFnZxZlh41Ant7uEQT3yaOASVtMzaLgnW8Jn0iormJypT9XFtmgcNbtxMU1a8I1 nl8JZ99bMzMMOUPdI5fu7UzTv48R5pY5GVdj540CIHFVITn5 X-Developer-Key: i=dmitry.baryshkov@linaro.org; a=openpgp; fpr=8F88381DD5C873E4AE487DA5199BF1243632046A If a probe function returns -EPROBE_DEFER after creating another device there is a change of ending up in a probe deferral loop, (see commit fbc35b45f9f6 ("Add documentation on meaning of -EPROBE_DEFER"). In case of the qcom-pmic-typec driver the tcpm_register_port() function looks up external resources (USB role switch and inherently via called typec_register_port() USB-C muxes, switches and retimers). In order to prevent such probe-defer loops caused by qcom-pmic-typec driver, use the API added by Johan Hovold and move HPD bridge registration to the end of the probe function. The devm_drm_dp_hpd_bridge_add() is called at the end of the probe function after all TCPM start functions. This is done as a way to overcome a different problem, the DRM subsystem can not properly cope with the DRM bridges being destroyed once the bridge is attached. Having this function call at the end of the probe function prevents possible DRM bridge device creation followed by destruction in case one of the TCPM start functions returns an error. Reported-by: Caleb Connolly Acked-by: Bryan O'Donoghue Signed-off-by: Dmitry Baryshkov --- Dependency: https://lore.kernel.org/lkml/20240418145730.4605-2-johan+linaro@kernel.org/ --- Changes in v4: - Rebased on top of Johan's patches - Link to v3: https://lore.kernel.org/r/20240416-qc-pmic-typec-hpd-split-v3-1-fd071e3191a1@linaro.org Changes in v3: - Updated commit message to explain my decisions (Johan). - Link to v2: https://lore.kernel.org/r/20240408-qc-pmic-typec-hpd-split-v2-1-1704f5321b73@linaro.org Changes in v2: - Fix commit message (Bryan) - Link to v1: https://lore.kernel.org/r/20240405-qc-pmic-typec-hpd-split-v1-1-363daafb3c36@linaro.org --- drivers/usb/typec/tcpm/qcom/qcom_pmic_typec.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec.c b/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec.c index d3958c061a97..501eddb294e4 100644 --- a/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec.c +++ b/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec.c @@ -41,7 +41,7 @@ static int qcom_pmic_typec_probe(struct platform_device *pdev) struct device_node *np = dev->of_node; const struct pmic_typec_resources *res; struct regmap *regmap; - struct device *bridge_dev; + struct auxiliary_device *bridge_dev; u32 base; int ret; @@ -92,7 +92,7 @@ static int qcom_pmic_typec_probe(struct platform_device *pdev) if (!tcpm->tcpc.fwnode) return -EINVAL; - bridge_dev = drm_dp_hpd_bridge_register(tcpm->dev, to_of_node(tcpm->tcpc.fwnode)); + bridge_dev = devm_drm_dp_hpd_bridge_alloc(tcpm->dev, to_of_node(tcpm->tcpc.fwnode)); if (IS_ERR(bridge_dev)) return PTR_ERR(bridge_dev); @@ -110,8 +110,14 @@ static int qcom_pmic_typec_probe(struct platform_device *pdev) if (ret) goto port_stop; + ret = devm_drm_dp_hpd_bridge_add(tcpm->dev, bridge_dev); + if (ret) + goto pdphy_stop; + return 0; +pdphy_stop: + tcpm->pdphy_stop(tcpm); port_stop: tcpm->port_stop(tcpm); port_unregister: --- base-commit: 15d419fa23ecc51e388a369bbeaf3b47b0b5c76a change-id: 20240405-qc-pmic-typec-hpd-split-22804201902b Best regards, -- Dmitry Baryshkov