Hi Maxime
On Wed, 8 Jul 2020 at 18:43, Maxime Ripard <maxime@xxxxxxxxxx> wrote:
>
> The BCM2711 and BCM283x HDMI controllers use a slightly different reset
> sequence, so let's add a callback to reset the controller.
>
> Signed-off-by: Maxime Ripard <maxime@xxxxxxxxxx>
Reviewed-by: Dave Stevenson <dave.stevenson@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/vc4/vc4_hdmi.c | 31 ++++++++++++++++++-------------
> drivers/gpu/drm/vc4/vc4_hdmi.h | 3 +++
> 2 files changed, 21 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
> index a4fed1439bf3..80bc3dd9d4a8 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
> @@ -69,6 +69,21 @@ static int vc4_hdmi_debugfs_regs(struct seq_file *m, void *unused)
> return 0;
> }
>
> +static void vc4_hdmi_reset(struct vc4_hdmi *vc4_hdmi)
> +{
> + HDMI_WRITE(HDMI_M_CTL, VC4_HD_M_SW_RST);
> + udelay(1);
> + HDMI_WRITE(HDMI_M_CTL, 0);
> +
> + HDMI_WRITE(HDMI_M_CTL, VC4_HD_M_ENABLE);
> +
> + HDMI_WRITE(HDMI_SW_RESET_CONTROL,
> + VC4_HDMI_SW_RESET_HDMI |
> + VC4_HDMI_SW_RESET_FORMAT_DETECT);
> +
> + HDMI_WRITE(HDMI_SW_RESET_CONTROL, 0);
> +}
> +
> static enum drm_connector_status
> vc4_hdmi_connector_detect(struct drm_connector *connector, bool force)
> {
> @@ -363,11 +378,8 @@ static void vc4_hdmi_encoder_enable(struct drm_encoder *encoder)
> return;
> }
>
> - HDMI_WRITE(HDMI_SW_RESET_CONTROL,
> - VC4_HDMI_SW_RESET_HDMI |
> - VC4_HDMI_SW_RESET_FORMAT_DETECT);
> -
> - HDMI_WRITE(HDMI_SW_RESET_CONTROL, 0);
> + if (vc4_hdmi->variant->reset)
> + vc4_hdmi->variant->reset(vc4_hdmi);
>
> /* PHY should be in reset, like
> * vc4_hdmi_encoder_disable() does.
> @@ -1292,14 +1304,6 @@ static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data)
> vc4_hdmi->hpd_active_low = hpd_gpio_flags & OF_GPIO_ACTIVE_LOW;
> }
>
> - /* HDMI core must be enabled. */
> - if (!(HDMI_READ(HDMI_M_CTL) & VC4_HD_M_ENABLE)) {
> - HDMI_WRITE(HDMI_M_CTL, VC4_HD_M_SW_RST);
> - udelay(1);
> - HDMI_WRITE(HDMI_M_CTL, 0);
> -
> - HDMI_WRITE(HDMI_M_CTL, VC4_HD_M_ENABLE);
> - }
> pm_runtime_enable(dev);
>
> drm_simple_encoder_init(drm, encoder, DRM_MODE_ENCODER_TMDS);
> @@ -1428,6 +1432,7 @@ static const struct vc4_hdmi_variant bcm2835_variant = {
> .num_registers = ARRAY_SIZE(vc4_hdmi_fields),
>
> .init_resources = vc4_hdmi_init_resources,
> + .reset = vc4_hdmi_reset,
> };
>
> static const struct of_device_id vc4_hdmi_dt_match[] = {
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.h b/drivers/gpu/drm/vc4/vc4_hdmi.h
> index b36e0210671f..17a30589f39c 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.h
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.h
> @@ -35,6 +35,9 @@ struct vc4_hdmi_variant {
> * clocks, etc) for that variant.
> */
> int (*init_resources)(struct vc4_hdmi *vc4_hdmi);
> +
> + /* Callback to reset the HDMI block */
> + void (*reset)(struct vc4_hdmi *vc4_hdmi);
> };
>
> /* HDMI audio information */
> --
> git-series 0.9.1
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