On Mon, 16 Dec 2019 16:02:36 +0100
Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> wrote:
> Hi Boris,
>
> On 16.12.2019 15:55, Boris Brezillon wrote:
> > On Mon, 16 Dec 2019 14:54:25 +0100
> > Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> wrote:
> >> On 03.12.2019 15:15, Boris Brezillon wrote:
> >>> So that each element in the chain can easily access its predecessor.
> >>> This will be needed to support bus format negotiation between elements
> >>> of the bridge chain.
> >>>
> >>> Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
> >>> Reviewed-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
> >>> Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> >> I've noticed that this patch got merged to linux-next as commit
> >> 05193dc38197021894b17239fafbd2eb1afe5a45. Sadly it breaks booting of
> >> Samsung Exynos5250-based Arndale board. Booting stops after following
> >> messages:
> >>
> >> [drm] Exynos DRM: using 14400000.fimd device for DMA mapping operations
> >> exynos-drm exynos-drm: bound 14400000.fimd (ops fimd_component_ops)
> >> exynos-drm exynos-drm: bound 14450000.mixer (ops mixer_component_ops)
> >> exynos-drm exynos-drm: bound 14500000.dsi (ops exynos_dsi_component_ops)
> >> exynos-drm exynos-drm: bound 14530000.hdmi (ops hdmi_component_ops)
> >> [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
> >> [drm] No driver support for vblank timestamp query.
> >> [drm] Cannot find any crtc or sizes
> >> [drm] Cannot find any crtc or sizes
> >> [drm] Initialized exynos 1.1.0 20180330 for exynos-drm on minor 0
> >>
> >> I will try to debug this and provide more information soon.
> >>
> > Can you try with this diff applied?
>
> This patch doesn't change anything.
Okay. Can you do a list_for_each_entry() on both encoder->bridge_chain
and dsi->bridge_chain (dump bridge pointers in a pr_info()) before and
after the list_splice_init() call?
>
> > --->8---
> > diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> > index 3955f84dc893..118ecedc7621 100644
> > --- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> > +++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> > @@ -1523,7 +1523,7 @@ static int exynos_dsi_host_attach(struct mipi_dsi_host *host,
> > if (out_bridge) {
> > drm_bridge_attach(encoder, out_bridge, NULL);
> > dsi->out_bridge = out_bridge;
> > - list_splice(&encoder->bridge_chain, &dsi->bridge_chain);
> > + list_splice_init(&encoder->bridge_chain, &dsi->bridge_chain);
> > } else {
> > int ret = exynos_dsi_create_connector(encoder);
> >
> > diff --git a/drivers/gpu/drm/vc4/vc4_dsi.c b/drivers/gpu/drm/vc4/vc4_dsi.c
> > index 6c5b80ad6154..e1378d48210f 100644
> > --- a/drivers/gpu/drm/vc4/vc4_dsi.c
> > +++ b/drivers/gpu/drm/vc4/vc4_dsi.c
> > @@ -1613,7 +1613,7 @@ static int vc4_dsi_bind(struct device *dev, struct device *master, void *data)
> > * from our driver, since we need to sequence them within the
> > * encoder's enable/disable paths.
> > */
> > - list_splice(&dsi->encoder->bridge_chain, &dsi->bridge_chain);
> > + list_splice_init(&dsi->encoder->bridge_chain, &dsi->bridge_chain);
> >
> > if (dsi->port == 0)
> > vc4_debugfs_add_regset32(drm, "dsi0_regs", &dsi->regset);
> > @@ -1639,7 +1639,7 @@ static void vc4_dsi_unbind(struct device *dev, struct device *master,
> > * Restore the bridge_chain so the bridge detach procedure can happen
> > * normally.
> > */
> > - list_splice(&dsi->bridge_chain, &dsi->encoder->bridge_chain);
> > + list_splice_init(&dsi->bridge_chain, &dsi->encoder->bridge_chain);
> > vc4_dsi_encoder_destroy(dsi->encoder);
> >
> > if (dsi->port == 1)
> >
> >
> Best regards
_______________________________________________
dri-devel mailing list
dri-devel@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/dri-devel
