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Date: Tue, 28 Jul 2020 14:03:00 +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 53/78] drm/vc4: hdmi: Add PHY init and disable function
Hi Maxime
On Wed, 8 Jul 2020 at 18:43, Maxime Ripard <maxime@...no.tech> wrote:
>
> The HDMI PHY in the BCM2711 HDMI controller is significantly more
> complicated to setup than in the older BCM283x SoCs.
>
> Let's add hooks to enable and disable the PHY.
>
> Signed-off-by: Maxime Ripard <maxime@...no.tech>
Reviewed-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
> ---
> drivers/gpu/drm/vc4/Makefile | 1 +
> drivers/gpu/drm/vc4/vc4_hdmi.c | 14 +++++++-------
> drivers/gpu/drm/vc4/vc4_hdmi.h | 13 +++++++++++++
> drivers/gpu/drm/vc4/vc4_hdmi_phy.c | 25 +++++++++++++++++++++++++
> 4 files changed, 46 insertions(+), 7 deletions(-)
> create mode 100644 drivers/gpu/drm/vc4/vc4_hdmi_phy.c
>
> diff --git a/drivers/gpu/drm/vc4/Makefile b/drivers/gpu/drm/vc4/Makefile
> index b303703bc7f3..d0163e18e9ca 100644
> --- a/drivers/gpu/drm/vc4/Makefile
> +++ b/drivers/gpu/drm/vc4/Makefile
> @@ -12,6 +12,7 @@ vc4-y := \
> vc4_kms.o \
> vc4_gem.o \
> vc4_hdmi.o \
> + vc4_hdmi_phy.o \
> vc4_vec.o \
> vc4_hvs.o \
> vc4_irq.o \
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
> index 80bc3dd9d4a8..068041145d1c 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
> @@ -321,7 +321,9 @@ static void vc4_hdmi_encoder_disable(struct drm_encoder *encoder)
>
> HDMI_WRITE(HDMI_RAM_PACKET_CONFIG, 0);
>
> - HDMI_WRITE(HDMI_TX_PHY_RESET_CTL, 0xf << 16);
> + if (vc4_hdmi->variant->phy_disable)
> + vc4_hdmi->variant->phy_disable(vc4_hdmi);
> +
> HDMI_WRITE(HDMI_VID_CTL,
> HDMI_READ(HDMI_VID_CTL) & ~VC4_HD_VID_CTL_ENABLE);
>
> @@ -381,12 +383,8 @@ static void vc4_hdmi_encoder_enable(struct drm_encoder *encoder)
> if (vc4_hdmi->variant->reset)
> vc4_hdmi->variant->reset(vc4_hdmi);
>
> - /* PHY should be in reset, like
> - * vc4_hdmi_encoder_disable() does.
> - */
> - HDMI_WRITE(HDMI_TX_PHY_RESET_CTL, 0xf << 16);
> -
> - HDMI_WRITE(HDMI_TX_PHY_RESET_CTL, 0);
> + if (vc4_hdmi->variant->phy_init)
> + vc4_hdmi->variant->phy_init(vc4_hdmi, mode);
>
> if (debug_dump_regs) {
> struct drm_printer p = drm_info_printer(&vc4_hdmi->pdev->dev);
> @@ -1433,6 +1431,8 @@ static const struct vc4_hdmi_variant bcm2835_variant = {
>
> .init_resources = vc4_hdmi_init_resources,
> .reset = vc4_hdmi_reset,
> + .phy_init = vc4_hdmi_phy_init,
> + .phy_disable = vc4_hdmi_phy_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 17a30589f39c..32c80161c786 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.h
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.h
> @@ -21,6 +21,8 @@ to_vc4_hdmi_encoder(struct drm_encoder *encoder)
> return container_of(encoder, struct vc4_hdmi_encoder, base.base);
> }
>
> +struct drm_display_mode;
> +
> struct vc4_hdmi;
> struct vc4_hdmi_register;
>
> @@ -38,6 +40,13 @@ struct vc4_hdmi_variant {
>
> /* Callback to reset the HDMI block */
> void (*reset)(struct vc4_hdmi *vc4_hdmi);
> +
> + /* Callback to initialize the PHY according to the mode */
> + void (*phy_init)(struct vc4_hdmi *vc4_hdmi,
> + struct drm_display_mode *mode);
> +
> + /* Callback to disable the PHY */
> + void (*phy_disable)(struct vc4_hdmi *vc4_hdmi);
> };
>
> /* HDMI audio information */
> @@ -95,4 +104,8 @@ encoder_to_vc4_hdmi(struct drm_encoder *encoder)
> return container_of(_encoder, struct vc4_hdmi, 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);
> +
> #endif /* _VC4_HDMI_H_ */
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi_phy.c b/drivers/gpu/drm/vc4/vc4_hdmi_phy.c
> new file mode 100644
> index 000000000000..5a1746877bb5
> --- /dev/null
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi_phy.c
> @@ -0,0 +1,25 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2015 Broadcom
> + * Copyright (c) 2014 The Linux Foundation. All rights reserved.
> + * Copyright (C) 2013 Red Hat
> + * Author: Rob Clark <robdclark@...il.com>
> + */
> +
> +#include "vc4_hdmi.h"
> +#include "vc4_hdmi_regs.h"
> +
> +void vc4_hdmi_phy_init(struct vc4_hdmi *vc4_hdmi, struct drm_display_mode *mode)
> +{
> + /* PHY should be in reset, like
> + * vc4_hdmi_encoder_disable() does.
> + */
> +
> + HDMI_WRITE(HDMI_TX_PHY_RESET_CTL, 0xf << 16);
> + HDMI_WRITE(HDMI_TX_PHY_RESET_CTL, 0);
> +}
> +
> +void vc4_hdmi_phy_disable(struct vc4_hdmi *vc4_hdmi)
> +{
> + HDMI_WRITE(HDMI_TX_PHY_RESET_CTL, 0xf << 16);
> +}
> --
> git-series 0.9.1
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