Re: [RFC PATCH 3/8] drm: verisilicon: add a driver for Verisilicon display controllers

[Philipp Zabel]

On Fr, 2025-08-15 at 00:40 +0800, Icenowy Zheng wrote:
> This is a from-scratch driver targeting Verisilicon DC-series display
> controllers, which feature self-identification functionality like their
> GC-series GPUs.
> 
> Only DC8200 is being supported now, and only the main framebuffer is set
> up (as the DRM primary plane). Support for more DC models and more
> features is my further targets.
> 
> As the display controller is delivered to SoC vendors as a whole part,
> this driver does not use component framework and extra bridges inside a
> SoC is expected to be implemented as dedicated bridges (this driver
> properly supports bridge chaining).
> 
> Signed-off-by: Icenowy Zheng <uwu@xxxxxxxxxx>
> ---
>  drivers/gpu/drm/Kconfig                       |   2 +
>  drivers/gpu/drm/Makefile                      |   1 +
>  drivers/gpu/drm/verisilicon/Kconfig           |  15 +
>  drivers/gpu/drm/verisilicon/Makefile          |   5 +
>  drivers/gpu/drm/verisilicon/vs_bridge.c       | 330 ++++++++++++++++++
>  drivers/gpu/drm/verisilicon/vs_bridge.h       |  40 +++
>  drivers/gpu/drm/verisilicon/vs_bridge_regs.h  |  47 +++
>  drivers/gpu/drm/verisilicon/vs_crtc.c         | 217 ++++++++++++
>  drivers/gpu/drm/verisilicon/vs_crtc.h         |  29 ++
>  drivers/gpu/drm/verisilicon/vs_crtc_regs.h    |  60 ++++
>  drivers/gpu/drm/verisilicon/vs_dc.c           | 233 +++++++++++++
>  drivers/gpu/drm/verisilicon/vs_dc.h           |  39 +++
>  drivers/gpu/drm/verisilicon/vs_dc_top_regs.h  |  27 ++
>  drivers/gpu/drm/verisilicon/vs_drm.c          | 177 ++++++++++
>  drivers/gpu/drm/verisilicon/vs_drm.h          |  29 ++
>  drivers/gpu/drm/verisilicon/vs_hwdb.c         | 150 ++++++++
>  drivers/gpu/drm/verisilicon/vs_hwdb.h         |  29 ++
>  drivers/gpu/drm/verisilicon/vs_plane.c        | 102 ++++++
>  drivers/gpu/drm/verisilicon/vs_plane.h        |  68 ++++
>  .../gpu/drm/verisilicon/vs_primary_plane.c    | 166 +++++++++
>  .../drm/verisilicon/vs_primary_plane_regs.h   |  53 +++
>  21 files changed, 1819 insertions(+)
>  create mode 100644 drivers/gpu/drm/verisilicon/Kconfig
>  create mode 100644 drivers/gpu/drm/verisilicon/Makefile
>  create mode 100644 drivers/gpu/drm/verisilicon/vs_bridge.c
>  create mode 100644 drivers/gpu/drm/verisilicon/vs_bridge.h
>  create mode 100644 drivers/gpu/drm/verisilicon/vs_bridge_regs.h
>  create mode 100644 drivers/gpu/drm/verisilicon/vs_crtc.c
>  create mode 100644 drivers/gpu/drm/verisilicon/vs_crtc.h
>  create mode 100644 drivers/gpu/drm/verisilicon/vs_crtc_regs.h
>  create mode 100644 drivers/gpu/drm/verisilicon/vs_dc.c
>  create mode 100644 drivers/gpu/drm/verisilicon/vs_dc.h
>  create mode 100644 drivers/gpu/drm/verisilicon/vs_dc_top_regs.h
>  create mode 100644 drivers/gpu/drm/verisilicon/vs_drm.c
>  create mode 100644 drivers/gpu/drm/verisilicon/vs_drm.h
>  create mode 100644 drivers/gpu/drm/verisilicon/vs_hwdb.c
>  create mode 100644 drivers/gpu/drm/verisilicon/vs_hwdb.h
>  create mode 100644 drivers/gpu/drm/verisilicon/vs_plane.c
>  create mode 100644 drivers/gpu/drm/verisilicon/vs_plane.h
>  create mode 100644 drivers/gpu/drm/verisilicon/vs_primary_plane.c
>  create mode 100644 drivers/gpu/drm/verisilicon/vs_primary_plane_regs.h
> 
[...]
> diff --git a/drivers/gpu/drm/verisilicon/vs_dc.c b/drivers/gpu/drm/verisilicon/vs_dc.c
> new file mode 100644
> index 0000000000000..98384559568c4
> --- /dev/null
> +++ b/drivers/gpu/drm/verisilicon/vs_dc.c
> @@ -0,0 +1,233 @@
[...]
> +static int vs_dc_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct vs_dc *dc;
> +	void __iomem *regs;
> +	unsigned int outputs, i;
> +	/* pix0/pix1 */
> +	char pixclk_name[5];
> +	int irq, ret;
> +
> +	if (!dev->of_node) {
> +		dev_err(dev, "can't find DC devices\n");
> +		return -ENODEV;
> +	}
> +
> +	outputs = of_graph_get_port_count(dev->of_node);
> +	if (!outputs) {
> +		dev_err(dev, "can't find DC downstream ports\n");
> +		return -ENODEV;
> +	}
> +	if (outputs > VSDC_MAX_OUTPUTS) {
> +		dev_err(dev, "too many DC downstream ports than possible\n");
> +		return -EINVAL;
> +	}
> +
> +	ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
> +	if (ret) {
> +		dev_err(dev, "No suitable DMA available\n");
> +		return ret;
> +	}
> +
> +	dc = devm_kzalloc(dev, sizeof(*dc), GFP_KERNEL);
> +	if (!dc)
> +		return -ENOMEM;
> +
> +	dc->outputs = outputs;
> +
> +	dc->rsts[0].id = "core";
> +	dc->rsts[1].id = "axi";
> +	dc->rsts[0].id = "ahb";

I assume this should be:

	dc->rsts[2].id = "ahb";

> +
> +	ret = devm_reset_control_bulk_get_optional_shared(dev, VSDC_RESET_COUNT,
> +							  dc->rsts);
> +	if (ret) {
> +		dev_err(dev, "can't get reset lines\n");

Consider using dev_err_probe().

> +		return ret;
> +	}
[...]

regards
Philipp