linux-kernel - Re: [PATCH v2 2/2] usb: typec: qcom-pmic-typec: register drm

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Date:   Mon, 10 Jul 2023 13:57:06 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     "Bryan O'Donoghue" <bryan.odonoghue@...aro.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v2 2/2] usb: typec: qcom-pmic-typec: register drm_bridge

On Mon, 10 Jul 2023 at 13:04, Konrad Dybcio <konrad.dybcio@...aro.org> wrote:
>
> On 10.07.2023 12:02, Bryan O'Donoghue wrote:
> > On 09/07/2023 21:13, 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.
> >>
> >> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> >> ---
> >>   drivers/usb/typec/tcpm/Kconfig                |  1 +
> >>   drivers/usb/typec/tcpm/qcom/qcom_pmic_typec.c | 39 +++++++++++++++++++
> >>   2 files changed, 40 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
> >> diff --git a/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec.c b/drivers/usb/typec/tcpm/qcom/qcom_pmic_typec.c
> >> index a905160dd860..0722fb8d75c4 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 +36,9 @@ struct pmic_typec {
> >>       struct pmic_typec_port    *pmic_typec_port;
> >>       bool            vbus_enabled;
> >>       struct mutex        lock;        /* VBUS state serialization */
> >> +#ifdef CONFIG_DRM
> >> +    struct drm_bridge    bridge;
> >> +#endif
> >
> > IMO there's no reason to ifdef the structure. Its up to you if you want to change it nor not, I have no strong feelings about it.
> +1, there's no ifdefs in the drm_bridge.h header that would make this not compile

It is quite typical to idef unused structure fields. For example
OF-related fields are frequently ifdef'ed.
Let's see what the maintainers will say.

>
> Konrad
> >
> > Acked-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> >
> > ---
> > bod



-- 
With best wishes
Dmitry