2024-05-11 14:30:44

by Sui Jingfeng

Subject: [PATCH] drm/bridge: cdns-mhdp8546: Remove a redundant check on existence of bridge->encoder

In the cdns_mhdp_connector_init() function, the check on the existence
of bridge->encoder is not necessary, as it has already been done in the
drm_bridge_attach() function. And the check on the drm bridge core
happens before check in the implementation. Hence, it is guaranteed that
the .encoder member of the struct drm_bridge is not NULL when
adv7511_bridge_attach() function gets called.

Remove the redundant checking codes "if (!bridge->encoder) { ... }".

Signed-off-by: Sui Jingfeng <[email protected]>
---
drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c | 5 -----
1 file changed, 5 deletions(-)

diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
index e226acc5c15e..16b58a7dcc54 100644
--- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
+++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
@@ -1697,11 +1697,6 @@ static int cdns_mhdp_connector_init(struct cdns_mhdp_device *mhdp)
struct drm_bridge *bridge = &mhdp->bridge;
int ret;

- if (!bridge->encoder) {
- dev_err(mhdp->dev, "Parent encoder object not found");
- return -ENODEV;
- }
-
conn->polled = DRM_CONNECTOR_POLL_HPD;

ret = drm_connector_init(bridge->dev, conn, &cdns_mhdp_conn_funcs,
--
2.43.0

2024-05-12 21:22:38

by Laurent Pinchart

Subject: Re: [PATCH] drm/bridge: cdns-mhdp8546: Remove a redundant check on existence of bridge->encoder

Hi Sui,

Thank you for the patch.

On Sat, May 11, 2024 at 10:30:27PM +0800, Sui Jingfeng wrote:
> In the cdns_mhdp_connector_init() function, the check on the existence
> of bridge->encoder is not necessary, as it has already been done in the
> drm_bridge_attach() function. And the check on the drm bridge core
> happens before check in the implementation. Hence, it is guaranteed that
> the .encoder member of the struct drm_bridge is not NULL when
> adv7511_bridge_attach() function gets called.
>
> Remove the redundant checking codes "if (!bridge->encoder) { ... }".
>
> Signed-off-by: Sui Jingfeng <[email protected]>

Reviewed-by: Laurent Pinchart <[email protected]>

> ---
> drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c | 5 -----
> 1 file changed, 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
> index e226acc5c15e..16b58a7dcc54 100644
> --- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
> +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
> @@ -1697,11 +1697,6 @@ static int cdns_mhdp_connector_init(struct cdns_mhdp_device *mhdp)
> struct drm_bridge *bridge = &mhdp->bridge;
> int ret;
>
> - if (!bridge->encoder) {
> - dev_err(mhdp->dev, "Parent encoder object not found");
> - return -ENODEV;
> - }
> -
> conn->polled = DRM_CONNECTOR_POLL_HPD;
>
> ret = drm_connector_init(bridge->dev, conn, &cdns_mhdp_conn_funcs,

--
Regards,

Laurent Pinchart