Re: [PATCH RESEND 08/17] drm/spacemit: add Saturn DPU core types, cmdlist and display MMU

On Sa, 2026-07-25 at 00:51 -0400, Cody Kang via B4 Relay wrote:
> From: Cody Kang <[email protected]>
> 
> Register programming of the Saturn DPU is batched: the driver builds
> per-module register lists in memory and the hardware command-list
> engine replays them at frame boundaries, while scanout buffers are
> mapped through the DPU's private address translation unit (DMMU)
> rather than scanned out by physical address.
> 
> Add the shared driver types, the MMIO field accessors, the trace
> events, the command-list builder and the DMMU table code. Some DPU
> configuration registers are write-only, so a read-modify-write would
> corrupt neighbouring fields; byte- and halfword-aligned fields are
> therefore written at their native width instead.
> 
> Signed-off-by: Cody Kang <[email protected]>
> ---
>  drivers/gpu/drm/spacemit/dpu/dpu_saturn.h   |  35 +++
>  drivers/gpu/drm/spacemit/dpu/dpu_trace.h    | 350 ++++++++++++++++++++++++++++
>  drivers/gpu/drm/spacemit/spacemit_cmdlist.c | 304 ++++++++++++++++++++++++
>  drivers/gpu/drm/spacemit/spacemit_cmdlist.h | 146 ++++++++++++
>  drivers/gpu/drm/spacemit/spacemit_crtc.h    | 259 ++++++++++++++++++++
>  drivers/gpu/drm/spacemit/spacemit_dmmu.c    | 103 ++++++++
>  drivers/gpu/drm/spacemit/spacemit_dmmu.h    |  40 ++++
>  drivers/gpu/drm/spacemit/spacemit_dpu_reg.h | 108 +++++++++
>  drivers/gpu/drm/spacemit/spacemit_drm.h     |  68 ++++++
>  9 files changed, 1413 insertions(+)
> 
[...]
> diff --git a/drivers/gpu/drm/spacemit/spacemit_cmdlist.h b/drivers/gpu/drm/spacemit/spacemit_cmdlist.h
> new file mode 100644
> index 000000000000..d5acdbeb3b0e
> --- /dev/null
> +++ b/drivers/gpu/drm/spacemit/spacemit_cmdlist.h
> @@ -0,0 +1,146 @@
[...]
> +struct spacemit_crtc {
> +	struct device *dev;
> +	struct drm_crtc crtc;
> +	const struct dpu_core_ops *core;
> +	struct dpu_mmu_tbl mmu_tbl;
> +	int dev_id;
> +	int irq_online;
> +	struct timer_list cfg_rdy_timer;
> +
> +	bool is_1st_f;
> +	bool first_modeset;
> +	struct dpu_clk_context clk_ctx;
> +	u32 aclk;
> +	u32 out_format;
> +
> +	struct reset_control *mclk_reset;
> +	struct reset_control *lcd_reset;
> +	struct reset_control *esc_reset;
> +	struct reset_control *aclk_reset;
> +	struct reset_control *dsc_reset;

Why are these duplicated from spacemit_drm_private?
dpu_pm_suspend/resume() in patch 10 have access to priv.

regards
Philipp

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