On Thu, 23 Jan 2020 07:52:59 +0000 (UTC)
Jonas Karlman <jonas@xxxxxxxxx> wrote:
> On 2020-01-23 08:39, Boris Brezillon wrote:
> > On Wed, 22 Jan 2020 23:44:28 +0000 (UTC)
> > Jonas Karlman <jonas@xxxxxxxxx> wrote:
> >
> >>> +static int
> >>> +drm_atomic_bridge_chain_select_bus_fmts(struct drm_bridge *bridge,
> >>> + struct drm_crtc_state *crtc_state,
> >>> + struct drm_connector_state *conn_state)
> >>> +{
> >>> + struct drm_connector *conn = conn_state->connector;
> >>> + struct drm_encoder *encoder = bridge->encoder;
> >>> + struct drm_bridge_state *last_bridge_state;
> >>> + unsigned int i, num_out_bus_fmts;
> >>> + struct drm_bridge *last_bridge;
> >>> + u32 *out_bus_fmts;
> >>> + int ret = 0;
> >>> +
> >>> + last_bridge = list_last_entry(&encoder->bridge_chain,
> >>> + struct drm_bridge, chain_node);
> >>> + last_bridge_state = drm_atomic_get_new_bridge_state(crtc_state->state,
> >>> + last_bridge);
> >>> +
> >>> + if (last_bridge->funcs->atomic_get_output_bus_fmts) {
> >>> + const struct drm_bridge_funcs *funcs = last_bridge->funcs;
> >>> +
> >>> + /*
> >>> + * If the driver implements ->atomic_get_output_bus_fmts() it
> >>> + * should also implement the atomic state hooks.
> >>> + */
> >>> + if (WARN_ON(last_bridge_state))
> >>
> >> This looks wrong, with this changed to WARN_ON(!last_bridge_state)
> >> my RK3328 HDMI2.0/YUV444/YUV420/10-bit branch at [1] starts working.
> >>
> >> With WARN_ON(last_bridge_state) I get:
> >>
> >> [ 6.606658] WARNING: CPU: 0 PID: 167 at drivers/gpu/drm/drm_bridge.c:746 drm_atomic_bridge_chain_check+0x2b8/0x308
> >> [ 6.606673] Hardware name: Pine64 Rock64 (DT)
> >>
> >> [ 6.606754] Call trace:
> >> [ 6.606759] drm_atomic_bridge_chain_check+0x2b8/0x308
> >> [ 6.606764] drm_atomic_helper_check_modeset+0x89c/0xab8
> >> [ 6.606768] drm_atomic_helper_check+0x1c/0xa0
> >> [ 6.606772] drm_atomic_check_only+0x464/0x708
> >> [ 6.606777] drm_atomic_commit+0x18/0x58
> >
> > Add
> >
> > const drm_bridge_funcs ... = {
> > ...
> > .atomic_reset = drm_atomic_helper_bridge_reset,
> > .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
> > .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
> > ...
> > };
> >
> > and that should work.
>
> That is what I added and what made that this warning is being triggered.
> The comment state that atomic state is needed, but the check warns when there is a state.
>
> I have this:
>
> static const struct drm_bridge_funcs dw_hdmi_bridge_funcs = {
> ...
> .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
> .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
> .atomic_get_output_bus_fmts = dw_hdmi_bridge_atomic_get_output_bus_fmts,
> .atomic_get_input_bus_fmts = dw_hdmi_bridge_atomic_get_input_bus_fmts,
> .atomic_check = dw_hdmi_bridge_atomic_check,
> .atomic_reset = drm_atomic_helper_bridge_reset,
> ...
> };
>
> and
>
> static const struct drm_bridge_funcs dw_hdmi_rockchip_bridge_funcs = {
> ...
> .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
> .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
> .atomic_get_input_bus_fmts = dw_hdmi_rockchip_get_input_bus_fmts,
> .atomic_check = dw_hdmi_rockchip_bridge_atomic_check,
> .atomic_reset = drm_atomic_helper_bridge_reset,
> };
>
> after applying the following I got a hdmi signal again
>
> diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
> index 0c28816146ba..7e7b0fac8f4f 100644
> --- a/drivers/gpu/drm/drm_bridge.c
> +++ b/drivers/gpu/drm/drm_bridge.c
> @@ -743,7 +743,7 @@ drm_atomic_bridge_chain_select_bus_fmts(struct drm_bridge *bridge,
> * If the driver implements ->atomic_get_output_bus_fmts() it
> * should also implement the atomic state hooks.
> */
> - if (WARN_ON(last_bridge_state))
> + if (WARN_ON(!last_bridge_state))
> return -EINVAL;
My bad, I didn't read your email carefully. You're right, I'll fix it
in v8.
Thanks,
Boris
