[RFC PATCH 1/8] drm: writeback: Refactor drm_writeback_connector structure

[Dmitry Baryshkov]

On Mon, Aug 11, 2025 at 02:57:00PM +0530, Suraj Kandpal wrote:
> Some drivers cannot work with the current design where the connector
> is embedded within the drm_writeback_connector such as intel and
> some drivers that can get it working end up adding a lot of checks
> all around the code to check if it's a writeback conenctor or not.
> To solve this we move the drm_writeback_connector within the
> drm_connector and remove the drm_connector base which was in
> drm_writeback_connector. We do all other required
> modifications that come with these changes along with addition
> of new function which returns the drm_connector when
> drm_writeback_connector is present.
> All drivers will be expected to allocate the drm_connector.
> 
> Signed-off-by: Suraj Kandpal <suraj.kandpal at intel.com>
> ---
>  drivers/gpu/drm/drm_writeback.c | 33 ++++++++++------
>  include/drm/drm_connector.h     | 60 +++++++++++++++++++++++++++++
>  include/drm/drm_writeback.h     | 68 ++++-----------------------------
>  3 files changed, 89 insertions(+), 72 deletions(-)

This patch breaks building of drivers:

drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c: In function ‘dpu_encoder_phys_wb_prepare_for_kickoff’:
drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c:487:36: error: ‘struct drm_writeback_connector’ has no member named ‘base’
  487 |         drm_conn = &wb_enc->wb_conn->base;
      |                                    ^~

Please perform step-by-step modifications, making sure that on each
step all the drivers can be built and function as expected.

> 
> @@ -2305,6 +2360,11 @@ struct drm_connector {
>  	 * @cec: CEC-related data.
>  	 */
>  	struct drm_connector_cec cec;
> +
> +	/**
> +	 * @writeback: Writeback related valriables.
> +	 */
> +	struct drm_writeback_connector writeback;

I will respond to this in another thread.

>  };
>  
>  #define obj_to_connector(x) container_of(x, struct drm_connector, base)

-- 
With best wishes
Dmitry