linux-kernel - Re: [PATCH v5 2/2] usb: typec: qcom-pmic-typec: register drm

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Date:   Tue, 22 Aug 2023 16:54:34 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/2] usb: typec: qcom-pmic-typec: register drm_bridge

On Thu, Aug 17, 2023 at 06:08:24PM +0300, Dmitry Baryshkov wrote:
> The current approach to handling DP on bridge-enabled platforms requires
> a chain of DP bridges up to the USB-C connector. Register a last DRM
> bridge for such chain.
> 
> Acked-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
>  drivers/usb/typec/tcpm/Kconfig                |  1 +
>  drivers/usb/typec/tcpm/qcom/qcom_pmic_typec.c | 37 +++++++++++++++++++
>  2 files changed, 38 insertions(+)
> 
> diff --git a/drivers/usb/typec/tcpm/Kconfig b/drivers/usb/typec/tcpm/Kconfig
> index 5d393f520fc2..0b2993fef564 100644
> --- a/drivers/usb/typec/tcpm/Kconfig
> +++ b/drivers/usb/typec/tcpm/Kconfig
> @@ -79,6 +79,7 @@ config TYPEC_WCOVE
>  config TYPEC_QCOM_PMIC
>  	tristate "Qualcomm PMIC USB Type-C Port Controller Manager driver"
>  	depends on ARCH_QCOM || COMPILE_TEST
> +	depends on DRM || DRM=n
>  	help
>  	  A Type-C port and Power Delivery driver which aggregates two
>  	  discrete pieces of silicon in the PM8150b PMIC block: the

Would it be an option to put the below in separate c file that you
just compile based on CONFIG_DRM?

        obj-$(CONFIG_TYPEC_QCOM_PMIC)           += qcom_pmic_tcpm.o
        qcom_pmic_tcpm-y                        += qcom_pmic_typec.o \
                                                   qcom_pmic_typec_port.o \
                                                   qcom_pmic_typec_pdphy.o
        ifneq ($(CONFIG_DRM),)
               qcom_pmic_tcpm-y                 += qcom_pmic_bridge_func.o
        endif

Thouse ifdefs in c file just look a bit rough to me.

> diff --git a/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec.c b/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec.c
> index af44ee4e6e86..581199d37b49 100644
> --- a/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec.c
> +++ b/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec.c
> @@ -17,6 +17,9 @@
>  #include <linux/usb/role.h>
>  #include <linux/usb/tcpm.h>
>  #include <linux/usb/typec_mux.h>
> +
> +#include <drm/drm_bridge.h>
> +
>  #include "qcom_pmic_typec_pdphy.h"
>  #include "qcom_pmic_typec_port.h"
>  
> @@ -33,6 +36,7 @@ struct pmic_typec {
>  	struct pmic_typec_port	*pmic_typec_port;
>  	bool			vbus_enabled;
>  	struct mutex		lock;		/* VBUS state serialization */
> +	struct drm_bridge	bridge;
>  };
>  
>  #define tcpc_to_tcpm(_tcpc_) container_of(_tcpc_, struct pmic_typec, tcpc)
> @@ -146,6 +150,35 @@ static int qcom_pmic_typec_init(struct tcpc_dev *tcpc)
>  	return 0;
>  }
>  
> +#if IS_ENABLED(CONFIG_DRM)
> +static int qcom_pmic_typec_attach(struct drm_bridge *bridge,
> +				     enum drm_bridge_attach_flags flags)
> +{
> +	return flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR ? 0 : -EINVAL;
> +}
> +
> +static const struct drm_bridge_funcs qcom_pmic_typec_bridge_funcs = {
> +	.attach = qcom_pmic_typec_attach,
> +};
> +
> +static int qcom_pmic_typec_init_drm(struct pmic_typec *tcpm)
> +{
> +	tcpm->bridge.funcs = &qcom_pmic_typec_bridge_funcs;
> +#ifdef CONFIG_OF
> +	tcpm->bridge.of_node = of_get_child_by_name(tcpm->dev->of_node, "connector");
> +#endif
> +	tcpm->bridge.ops = DRM_BRIDGE_OP_HPD;
> +	tcpm->bridge.type = DRM_MODE_CONNECTOR_DisplayPort;
> +
> +	return devm_drm_bridge_add(tcpm->dev, &tcpm->bridge);
> +}
> +#else
> +static int qcom_pmic_typec_init_drm(struct pmic_typec *tcpm)
> +{
> +	return 0;
> +}
> +#endif
> +
>  static int qcom_pmic_typec_probe(struct platform_device *pdev)
>  {
>  	struct pmic_typec *tcpm;
> @@ -208,6 +241,10 @@ static int qcom_pmic_typec_probe(struct platform_device *pdev)
>  	mutex_init(&tcpm->lock);
>  	platform_set_drvdata(pdev, tcpm);
>  
> +	ret = qcom_pmic_typec_init_drm(tcpm);
> +	if (ret)
> +		return ret;
> +
>  	tcpm->tcpc.fwnode = device_get_named_child_node(tcpm->dev, "connector");
>  	if (!tcpm->tcpc.fwnode)
>  		return -EINVAL;

thanks,

-- 
heikki