Hi Liu Ying,
> -----Original Message-----
> From: Liu Ying <victor.liu@xxxxxxx>
> Sent: Friday, October 18, 2024 8:38 AM
> To: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>; devicetree@xxxxxxxxxxxxxxx; imx@xxxxxxxxxxxxxxx; linux-arm-
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> Subject: Re: [PATCH 5/5] drm: lcdif: Use drm_bridge_connector
>
> On 10/18/2024, Biju Das wrote:
> > Hi Liu Ying,
>
> Hi Biju,
>
> >
> > Thanks for the patch.
>
> Thanks for your review.
>
> >
> >> -----Original Message-----
> >> From: linux-arm-kernel <linux-arm-kernel-bounces@xxxxxxxxxxxxxxxxxxx>
> >> On Behalf Of Liu Ying
> >> Sent: Friday, October 18, 2024 7:48 AM
> >> Subject: [PATCH 5/5] drm: lcdif: Use drm_bridge_connector
> >>
> >> Initialize a connector by calling drm_bridge_connector_init() for
> >> each encoder so that down stream bridge drivers don't need to create connectors any more.
> >>
> >> Signed-off-by: Liu Ying <victor.liu@xxxxxxx>
> >> ---
> >> drivers/gpu/drm/mxsfb/Kconfig | 1 +
> >> drivers/gpu/drm/mxsfb/lcdif_drv.c | 17 ++++++++++++++++-
> >> 2 files changed, 17 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/gpu/drm/mxsfb/Kconfig
> >> b/drivers/gpu/drm/mxsfb/Kconfig index
> >> 264e74f45554..06c95e556380 100644
> >> --- a/drivers/gpu/drm/mxsfb/Kconfig
> >> +++ b/drivers/gpu/drm/mxsfb/Kconfig
> >> @@ -27,6 +27,7 @@ config DRM_IMX_LCDIF
> >> depends on DRM && OF
> >> depends on COMMON_CLK
> >> depends on ARCH_MXC || COMPILE_TEST
> >> + select DRM_BRIDGE_CONNECTOR
> >> select DRM_CLIENT_SELECTION
> >> select DRM_MXS
> >> select DRM_KMS_HELPER
> >> diff --git a/drivers/gpu/drm/mxsfb/lcdif_drv.c
> >> b/drivers/gpu/drm/mxsfb/lcdif_drv.c
> >> index 58ccad9c425d..d4521da6675e 100644
> >> --- a/drivers/gpu/drm/mxsfb/lcdif_drv.c
> >> +++ b/drivers/gpu/drm/mxsfb/lcdif_drv.c
> >> @@ -16,7 +16,9 @@
> >>
> >> #include <drm/drm_atomic_helper.h>
> >> #include <drm/drm_bridge.h>
> >> +#include <drm/drm_bridge_connector.h>
> >> #include <drm/drm_client_setup.h>
> >> +#include <drm/drm_connector.h>
> >> #include <drm/drm_drv.h>
> >> #include <drm/drm_encoder.h>
> >> #include <drm/drm_fbdev_dma.h>
> >> @@ -56,6 +58,7 @@ static int lcdif_attach_bridge(struct lcdif_drm_private *lcdif)
> >> struct device_node *remote;
> >> struct of_endpoint of_ep;
> >> struct drm_encoder *encoder;
> >> + struct drm_connector *connector;
> >>
> >> remote = of_graph_get_remote_port_parent(ep);
> >> if (!of_device_is_available(remote)) { @@ -97,13 +100,25 @@ static
> >> int lcdif_attach_bridge(struct lcdif_drm_private *lcdif)
> >> return ret;
> >> }
> >>
> >> - ret = drm_bridge_attach(encoder, bridge, NULL, 0);
> >> + ret = drm_bridge_attach(encoder, bridge, NULL,
> >> + DRM_BRIDGE_ATTACH_NO_CONNECTOR);
> >> if (ret) {
> >> of_node_put(ep);
> >> return dev_err_probe(dev, ret,
> >> "Failed to attach bridge for endpoint%u\n",
> >> of_ep.id);
> >> }
> >> +
> >> + connector = drm_bridge_connector_init(lcdif->drm, encoder);
> >> + if (IS_ERR(connector)) {
> >> + ret = PTR_ERR(connector);
> >> + dev_err(dev, "Failed to initialize bridge connector: %d\n",
> >> + ret);
> >> + of_node_put(ep);
> >> + return ret;
> >
> > Maybe same error path style like above??
> > of_node_put(ep);
> > return dev_err_probe(dev, PTR_ERR(connector),"Failed to initialize
> > bridge connector");
>
> I thought about that and decided not to use dev_err_probe() because I don't think
> drm_bridge_connector_init() may return -EPROBE_DEFER, no?
Yes, you are correct.
Reviewed-by: Biju Das <biju.das.jz@xxxxxxxxxxxxxx>
Cheers,
Biju
>
> >
> > Cheers,
> > Biju
> >
> >> + }
> >> +
> >> + drm_connector_attach_encoder(connector, encoder);
> >> }
> >>
> >> return 0;
> >> --
> >> 2.34.1
> >>
> >
>
> --
> Regards,
> Liu Ying
