Hi Maxime & Dom
On Thu, 10 Dec 2020 at 13:46, Maxime Ripard <maxime@xxxxxxxxxx> wrote:
>
> From: Dom Cobley <popcornmix@xxxxxxxxx>
>
> The hdmi reset got moved to a later point in the commit 9045e91a476b
> ("drm/vc4: hdmi: Add reset callback").
>
> However, the reset now occurs after vc4_hdmi_cec_init and so tramples
> the setup of registers like HDMI_CEC_CNTRL_1
>
> This only affects pi0-3 as on pi4 the cec registers are in a separate
> block
It does mean that this reset only happens once on bind rather than on
every pre_crtc_configure, but as this really is the big reset the
entire block I don't see it needing to be triggered on every
configure.
> Fixes: 9045e91a476b ("drm/vc4: hdmi: Add reset callback")
> Signed-off-by: Dom Cobley <popcornmix@xxxxxxxxx>
> Signed-off-by: Maxime Ripard <maxime@xxxxxxxxxx>
Reviewed-by: Dave Stevenson <dave.stevenson@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/vc4/vc4_hdmi.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
> index 8006bddc8fbb..3df1747dd917 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
> @@ -773,9 +773,6 @@ static void vc4_hdmi_encoder_pre_crtc_configure(struct drm_encoder *encoder,
> return;
> }
>
> - if (vc4_hdmi->variant->reset)
> - vc4_hdmi->variant->reset(vc4_hdmi);
> -
> if (vc4_hdmi->variant->phy_init)
> vc4_hdmi->variant->phy_init(vc4_hdmi, vc4_conn_state);
>
> @@ -1865,6 +1862,9 @@ static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data)
> vc4_hdmi->disable_wifi_frequencies =
> of_property_read_bool(dev->of_node, "wifi-2.4ghz-coexistence");
>
> + if (vc4_hdmi->variant->reset)
> + vc4_hdmi->variant->reset(vc4_hdmi);
> +
> pm_runtime_enable(dev);
>
> drm_simple_encoder_init(drm, encoder, DRM_MODE_ENCODER_TMDS);
> --
> 2.28.0
>
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