On Tue, 25 Aug 2020 at 04:33, Lyude Paul <lyude@xxxxxxxxxx> wrote:
>
> Not entirely sure why this never came up when I originally tested this
> (maybe some BIOSes already have this setup?) but the ->caps_init vfunc
> appears to cause the display engine to throw an exception on driver
> init, at least on my ThinkPad P72:
>
> nouveau 0000:01:00.0: disp: chid 0 mthd 008c data 00000000 0000508c 0000102b
>
> This is magic nvidia speak for "You need to have the DMA notifier offset
> programmed before you can call NV507D_GET_CAPABILITIES." So, let's fix
> this by doing that, and also perform an update afterwards to prevent
> racing with the GPU when reading capabilities.
>
> Changes since v1:
> * Don't just program the DMA notifier offset, make sure to actually
> perform an update
I'm not sure there's a need to send an Update() method here, I believe
GetCapabilities() is an action method on its own right?
Ben.
>
> Signed-off-by: Lyude Paul <lyude@xxxxxxxxxx>
> Fixes: 4a2cb4181b07 ("drm/nouveau/kms/nv50-: Probe SOR and PIOR caps for DP interlacing support")
> Cc: <stable@xxxxxxxxxxxxxxx> # v5.8+
> ---
> drivers/gpu/drm/nouveau/dispnv50/core507d.c | 25 ++++++++++++++++-----
> 1 file changed, 19 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/nouveau/dispnv50/core507d.c b/drivers/gpu/drm/nouveau/dispnv50/core507d.c
> index e341f572c2696..5e86feec3b720 100644
> --- a/drivers/gpu/drm/nouveau/dispnv50/core507d.c
> +++ b/drivers/gpu/drm/nouveau/dispnv50/core507d.c
> @@ -65,13 +65,26 @@ core507d_ntfy_init(struct nouveau_bo *bo, u32 offset)
> int
> core507d_caps_init(struct nouveau_drm *drm, struct nv50_disp *disp)
> {
> - u32 *push = evo_wait(&disp->core->chan, 2);
> + struct nv50_core *core = disp->core;
> + u32 interlock[NV50_DISP_INTERLOCK__SIZE] = {0};
> + u32 *push;
>
> - if (push) {
> - evo_mthd(push, 0x008c, 1);
> - evo_data(push, 0x0);
> - evo_kick(push, &disp->core->chan);
> - }
> + core->func->ntfy_init(disp->sync, NV50_DISP_CORE_NTFY);
> +
> + push = evo_wait(&core->chan, 4);
> + if (!push)
> + return 0;
> +
> + evo_mthd(push, 0x0084, 1);
> + evo_data(push, 0x80000000 | NV50_DISP_CORE_NTFY);
> + evo_mthd(push, 0x008c, 1);
> + evo_data(push, 0x0);
> + evo_kick(push, &core->chan);
> +
> + core->func->update(core, interlock, false);
> + if (core->func->ntfy_wait_done(disp->sync, NV50_DISP_CORE_NTFY,
> + core->chan.base.device))
> + NV_ERROR(drm, "core notifier timeout\n");
>
> return 0;
> }
> --
> 2.26.2
>
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