linux-kernel - Re: [PATCH v4 54/78] drm/vc4: hdmi: Add PHY RNG enable / disable function

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Message-ID: <CAPY8ntAB41UNyNCAACRzS_mo4R5EbSiV_z_vMfJmoEw1Mbj7xw@mail.gmail.com>
Date:   Tue, 28 Jul 2020 14:04:18 +0100
From:   Dave Stevenson <dave.stevenson@...pberrypi.com>
To:     Maxime Ripard <maxime@...no.tech>
Cc:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Eric Anholt <eric@...olt.net>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        linux-rpi-kernel@...ts.infradead.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org,
        LKML <linux-kernel@...r.kernel.org>,
        Tim Gover <tim.gover@...pberrypi.com>,
        Phil Elwell <phil@...pberrypi.com>
Subject: Re: [PATCH v4 54/78] drm/vc4: hdmi: Add PHY RNG enable / disable function

Hi Maxime

On Wed, 8 Jul 2020 at 18:43, Maxime Ripard <maxime@...no.tech> wrote:
>
> Let's continue the implementation of hooks for the parts that change in the
> BCM2711 SoC with the PHY RNG setup.
>
> Signed-off-by: Maxime Ripard <maxime@...no.tech>

Reviewed-by: Dave Stevenson <dave.stevenson@...pberrypi.com>

> ---
>  drivers/gpu/drm/vc4/vc4_hdmi.c     | 15 +++++++++------
>  drivers/gpu/drm/vc4/vc4_hdmi.h     |  8 ++++++++
>  drivers/gpu/drm/vc4/vc4_hdmi_phy.c | 15 +++++++++++++++
>  3 files changed, 32 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
> index 068041145d1c..19897d6525ac 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
> @@ -762,9 +762,9 @@ static int vc4_hdmi_audio_trigger(struct snd_pcm_substream *substream, int cmd,
>         switch (cmd) {
>         case SNDRV_PCM_TRIGGER_START:
>                 vc4_hdmi_set_audio_infoframe(encoder);
> -               HDMI_WRITE(HDMI_TX_PHY_CTL_0,
> -                          HDMI_READ(HDMI_TX_PHY_CTL_0) &
> -                          ~VC4_HDMI_TX_PHY_RNG_PWRDN);
> +
> +               if (vc4_hdmi->variant->phy_rng_enable)
> +                       vc4_hdmi->variant->phy_rng_enable(vc4_hdmi);
>
>                 HDMI_WRITE(HDMI_MAI_CTL,
>                            VC4_SET_FIELD(vc4_hdmi->audio.channels,
> @@ -776,9 +776,10 @@ static int vc4_hdmi_audio_trigger(struct snd_pcm_substream *substream, int cmd,
>                            VC4_HD_MAI_CTL_DLATE |
>                            VC4_HD_MAI_CTL_ERRORE |
>                            VC4_HD_MAI_CTL_ERRORF);
> -               HDMI_WRITE(HDMI_TX_PHY_CTL_0,
> -                          HDMI_READ(HDMI_TX_PHY_CTL_0) |
> -                          VC4_HDMI_TX_PHY_RNG_PWRDN);
> +
> +               if (vc4_hdmi->variant->phy_rng_disable)
> +                       vc4_hdmi->variant->phy_rng_disable(vc4_hdmi);
> +
>                 break;
>         default:
>                 break;
> @@ -1433,6 +1434,8 @@ static const struct vc4_hdmi_variant bcm2835_variant = {
>         .reset                  = vc4_hdmi_reset,
>         .phy_init               = vc4_hdmi_phy_init,
>         .phy_disable            = vc4_hdmi_phy_disable,
> +       .phy_rng_enable         = vc4_hdmi_phy_rng_enable,
> +       .phy_rng_disable        = vc4_hdmi_phy_rng_disable,
>  };
>
>  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 32c80161c786..950accbc44e4 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.h
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.h
> @@ -47,6 +47,12 @@ struct vc4_hdmi_variant {
>
>         /* Callback to disable the PHY */
>         void (*phy_disable)(struct vc4_hdmi *vc4_hdmi);
> +
> +       /* Callback to enable the RNG in the PHY */
> +       void (*phy_rng_enable)(struct vc4_hdmi *vc4_hdmi);
> +
> +       /* Callback to disable the RNG in the PHY */
> +       void (*phy_rng_disable)(struct vc4_hdmi *vc4_hdmi);
>  };
>
>  /* HDMI audio information */
> @@ -107,5 +113,7 @@ encoder_to_vc4_hdmi(struct drm_encoder *encoder)
>  void vc4_hdmi_phy_init(struct vc4_hdmi *vc4_hdmi,
>                        struct drm_display_mode *mode);
>  void vc4_hdmi_phy_disable(struct vc4_hdmi *vc4_hdmi);
> +void vc4_hdmi_phy_rng_enable(struct vc4_hdmi *vc4_hdmi);
> +void vc4_hdmi_phy_rng_disable(struct vc4_hdmi *vc4_hdmi);
>
>  #endif /* _VC4_HDMI_H_ */
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi_phy.c b/drivers/gpu/drm/vc4/vc4_hdmi_phy.c
> index 5a1746877bb5..93287e24d7d1 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi_phy.c
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi_phy.c
> @@ -7,6 +7,7 @@
>   */
>
>  #include "vc4_hdmi.h"
> +#include "vc4_regs.h"
>  #include "vc4_hdmi_regs.h"
>
>  void vc4_hdmi_phy_init(struct vc4_hdmi *vc4_hdmi, struct drm_display_mode *mode)
> @@ -23,3 +24,17 @@ void vc4_hdmi_phy_disable(struct vc4_hdmi *vc4_hdmi)
>  {
>         HDMI_WRITE(HDMI_TX_PHY_RESET_CTL, 0xf << 16);
>  }
> +
> +void vc4_hdmi_phy_rng_enable(struct vc4_hdmi *vc4_hdmi)
> +{
> +       HDMI_WRITE(HDMI_TX_PHY_CTL_0,
> +                  HDMI_READ(HDMI_TX_PHY_CTL_0) &
> +                  ~VC4_HDMI_TX_PHY_RNG_PWRDN);
> +}
> +
> +void vc4_hdmi_phy_rng_disable(struct vc4_hdmi *vc4_hdmi)
> +{
> +       HDMI_WRITE(HDMI_TX_PHY_CTL_0,
> +                  HDMI_READ(HDMI_TX_PHY_CTL_0) |
> +                  VC4_HDMI_TX_PHY_RNG_PWRDN);
> +}
> --
> git-series 0.9.1