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Date: Thu, 20 Jan 2022 19:52:54 +0530
From: Jagan Teki <jagan@...rulasolutions.com>
To: Neil Armstrong <narmstrong@...libre.com>
Cc: dri-devel@...ts.freedesktop.org,
martin.blumenstingl@...glemail.com,
linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 5/6] drm/meson: add DSI encoder
On Thu, Jan 20, 2022 at 2:04 PM Neil Armstrong <narmstrong@...libre.com> wrote:
>
> This adds an encoder bridge designed to drive a MIPI-DSI display
> by using the ENCL encoder through the internal MIPI DSI transceiver
> connected to the output of the ENCL pixel encoder.
>
> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
> ---
> drivers/gpu/drm/meson/Makefile | 2 +-
> drivers/gpu/drm/meson/meson_drv.c | 7 +
> drivers/gpu/drm/meson/meson_encoder_dsi.c | 160 ++++++++++++++++++++++
> drivers/gpu/drm/meson/meson_encoder_dsi.h | 12 ++
> 4 files changed, 180 insertions(+), 1 deletion(-)
> create mode 100644 drivers/gpu/drm/meson/meson_encoder_dsi.c
> create mode 100644 drivers/gpu/drm/meson/meson_encoder_dsi.h
>
> diff --git a/drivers/gpu/drm/meson/Makefile b/drivers/gpu/drm/meson/Makefile
> index 3afa31bdc950..833e18c20603 100644
> --- a/drivers/gpu/drm/meson/Makefile
> +++ b/drivers/gpu/drm/meson/Makefile
> @@ -2,7 +2,7 @@
> meson-drm-y := meson_drv.o meson_plane.o meson_crtc.o meson_encoder_cvbs.o
> meson-drm-y += meson_viu.o meson_vpp.o meson_venc.o meson_vclk.o meson_overlay.o
> meson-drm-y += meson_rdma.o meson_osd_afbcd.o
> -meson-drm-y += meson_encoder_hdmi.o
> +meson-drm-y += meson_encoder_hdmi.o meson_encoder_dsi.o
>
> obj-$(CONFIG_DRM_MESON) += meson-drm.o
> obj-$(CONFIG_DRM_MESON_DW_HDMI) += meson_dw_hdmi.o
> diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c
> index 26aeaf0ab86e..15344cf9f913 100644
> --- a/drivers/gpu/drm/meson/meson_drv.c
> +++ b/drivers/gpu/drm/meson/meson_drv.c
> @@ -33,6 +33,7 @@
> #include "meson_registers.h"
> #include "meson_encoder_cvbs.h"
> #include "meson_encoder_hdmi.h"
> +#include "meson_encoder_dsi.h"
> #include "meson_viu.h"
> #include "meson_vpp.h"
> #include "meson_rdma.h"
> @@ -323,6 +324,12 @@ static int meson_drv_bind_master(struct device *dev, bool has_components)
> if (ret)
> goto exit_afbcd;
>
> + if (meson_vpu_is_compatible(priv, VPU_COMPATIBLE_G12A)) {
> + ret = meson_encoder_dsi_init(priv);
> + if (ret)
> + goto free_drm;
> + }
> +
> ret = meson_plane_create(priv);
> if (ret)
> goto exit_afbcd;
> diff --git a/drivers/gpu/drm/meson/meson_encoder_dsi.c b/drivers/gpu/drm/meson/meson_encoder_dsi.c
> new file mode 100644
> index 000000000000..12a586316183
> --- /dev/null
> +++ b/drivers/gpu/drm/meson/meson_encoder_dsi.c
> @@ -0,0 +1,160 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (C) 2016 BayLibre, SAS
> + * Author: Neil Armstrong <narmstrong@...libre.com>
> + * Copyright (C) 2015 Amlogic, Inc. All rights reserved.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <linux/of_graph.h>
> +
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_simple_kms_helper.h>
> +#include <drm/drm_bridge.h>
> +#include <drm/drm_bridge_connector.h>
> +#include <drm/drm_device.h>
> +#include <drm/drm_probe_helper.h>
> +
> +#include "meson_drv.h"
> +#include "meson_encoder_dsi.h"
> +#include "meson_registers.h"
> +#include "meson_venc.h"
> +#include "meson_vclk.h"
> +
> +struct meson_encoder_dsi {
> + struct drm_encoder encoder;
> + struct drm_bridge bridge;
> + struct drm_bridge *next_bridge;
> + struct meson_drm *priv;
> +};
> +
> +#define bridge_to_meson_encoder_dsi(x) \
> + container_of(x, struct meson_encoder_dsi, bridge)
> +
> +static int meson_encoder_dsi_attach(struct drm_bridge *bridge,
> + enum drm_bridge_attach_flags flags)
> +{
> + struct meson_encoder_dsi *encoder_dsi = bridge_to_meson_encoder_dsi(bridge);
> +
> + return drm_bridge_attach(bridge->encoder, encoder_dsi->next_bridge,
> + &encoder_dsi->bridge, flags);
> +}
> +
> +static void meson_encoder_dsi_mode_set(struct drm_bridge *bridge,
> + const struct drm_display_mode *mode,
> + const struct drm_display_mode *adjusted_mode)
> +{
> + struct meson_encoder_dsi *encoder_dsi = bridge_to_meson_encoder_dsi(bridge);
> + struct meson_drm *priv = encoder_dsi->priv;
> +
> + meson_vclk_setup(priv, MESON_VCLK_TARGET_DSI, mode->clock, 0, 0, 0, false);
> +
> + meson_venc_mipi_dsi_mode_set(priv, mode);
> + meson_encl_load_gamma(priv);
> +
> + writel_relaxed(0, priv->io_base + _REG(ENCL_VIDEO_EN));
> +
> + writel_bits_relaxed(ENCL_VIDEO_MODE_ADV_VFIFO_EN, ENCL_VIDEO_MODE_ADV_VFIFO_EN,
> + priv->io_base + _REG(ENCL_VIDEO_MODE_ADV));
> + writel_relaxed(0, priv->io_base + _REG(ENCL_TST_EN));
> +}
> +
> +static void meson_encoder_dsi_atomic_enable(struct drm_bridge *bridge,
> + struct drm_bridge_state *bridge_state)
> +{
> + struct meson_encoder_dsi *encoder_dsi = bridge_to_meson_encoder_dsi(bridge);
> + struct meson_drm *priv = encoder_dsi->priv;
> +
> + writel_bits_relaxed(BIT(0), 0, priv->io_base + _REG(VPP_WRAP_OSD1_MATRIX_EN_CTRL));
> +
> + writel_relaxed(1, priv->io_base + _REG(ENCL_VIDEO_EN));
> +}
> +
> +static void meson_encoder_dsi_atomic_disable(struct drm_bridge *bridge,
> + struct drm_bridge_state *bridge_state)
> +{
> + struct meson_encoder_dsi *meson_encoder_dsi =
> + bridge_to_meson_encoder_dsi(bridge);
> + struct meson_drm *priv = meson_encoder_dsi->priv;
> +
> + writel_relaxed(0, priv->io_base + _REG(ENCL_VIDEO_EN));
> +
> + writel_bits_relaxed(BIT(0), BIT(0), priv->io_base + _REG(VPP_WRAP_OSD1_MATRIX_EN_CTRL));
> +}
> +
> +static const struct drm_bridge_funcs meson_encoder_dsi_bridge_funcs = {
> + .attach = meson_encoder_dsi_attach,
> + /*
> + * TOFIX: remove when dw-mipi-dsi moves out of mode_set
> + * We should get rid of mode_set, but until dw-mipi-dsi uses it
> + * we need to setup the pixel clock before the following
> + * bridge tries to setup the HW.
> + */
> + .mode_set = meson_encoder_dsi_mode_set,
> + .atomic_enable = meson_encoder_dsi_atomic_enable,
> + .atomic_disable = meson_encoder_dsi_atomic_disable,
> + .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
> + .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
> + .atomic_reset = drm_atomic_helper_bridge_reset,
> +};
> +
> +int meson_encoder_dsi_init(struct meson_drm *priv)
> +{
> + struct meson_encoder_dsi *meson_encoder_dsi;
> + struct device_node *remote;
> + int ret;
> +
> + meson_encoder_dsi = devm_kzalloc(priv->dev, sizeof(*meson_encoder_dsi), GFP_KERNEL);
> + if (!meson_encoder_dsi)
> + return -ENOMEM;
> +
> + /* DSI Transceiver Bridge */
> + remote = of_graph_get_remote_node(priv->dev->of_node, 2, 0);
> + if (!remote) {
> + dev_err(priv->dev, "DSI transceiver device is disabled");
> + return 0;
> + }
> +
> + meson_encoder_dsi->next_bridge = of_drm_find_bridge(remote);
> + if (!meson_encoder_dsi->next_bridge) {
> + dev_dbg(priv->dev, "Failed to find DSI transceiver bridge: %d\n", ret);
> + return -EPROBE_DEFER;
> + }
> +
> + /* DSI Encoder Bridge */
> + meson_encoder_dsi->bridge.funcs = &meson_encoder_dsi_bridge_funcs;
> + meson_encoder_dsi->bridge.of_node = priv->dev->of_node;
> + meson_encoder_dsi->bridge.type = DRM_MODE_CONNECTOR_DSI;
> +
> + drm_bridge_add(&meson_encoder_dsi->bridge);
> +
> + meson_encoder_dsi->priv = priv;
> +
> + /* Encoder */
> + ret = drm_simple_encoder_init(priv->drm, &meson_encoder_dsi->encoder,
> + DRM_MODE_ENCODER_DSI);
> + if (ret) {
> + dev_err(priv->dev, "Failed to init DSI encoder: %d\n", ret);
> + return ret;
> + }
> +
> + meson_encoder_dsi->encoder.possible_crtcs = BIT(0);
> +
> + /* Attach DSI Encoder Bridge to Encoder */
> + ret = drm_bridge_attach(&meson_encoder_dsi->encoder, &meson_encoder_dsi->bridge, NULL, 0);
> + if (ret) {
> + dev_err(priv->dev, "Failed to attach bridge: %d\n", ret);
> + return ret;
> + }
> +
> + /*
> + * We should have now in place:
> + * encoder->[dsi encoder bridge]->[dw-mipi-dsi bridge]->[panel bridge]->[panel]
> + */
Reviewed-by: Jagan Teki <jagan@...rulasolutions.com>
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