Re: [PATCH v5 11/17] drm/meson: add DSI encoder

Nicolas Belin
2023-05-31T09:22:40Z

Le mar. 30 mai 2023 à 09:38, Neil Armstrong
<neil.armstrong@linaro.org> a écrit :
>
> 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@baylibre.com>
> Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
> Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
> ---
> drivers/gpu/drm/meson/Makefile | 2 +-
> drivers/gpu/drm/meson/meson_drv.c | 9 ++
> drivers/gpu/drm/meson/meson_drv.h | 1 +
> drivers/gpu/drm/meson/meson_encoder_dsi.c | 174 ++++++++++++++++++++++++++++++
> drivers/gpu/drm/meson/meson_encoder_dsi.h | 13 +++
> 5 files changed, 198 insertions(+), 1 deletion(-)
>
> 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 e935c0286a20..747b639ea0c4 100644
> --- a/drivers/gpu/drm/meson/meson_drv.c
> +++ b/drivers/gpu/drm/meson/meson_drv.c
> @@ -34,6 +34,7 @@
> #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"
> @@ -329,6 +330,12 @@ 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 exit_afbcd;
> + }
> +
> ret = meson_plane_create(priv);
> if (ret)
> goto exit_afbcd;
> @@ -367,6 +374,7 @@ static int meson_drv_bind_master(struct device *dev, bool has_components)
> free_drm:
> drm_dev_put(drm);
>
> + meson_encoder_dsi_remove(priv);
> meson_encoder_hdmi_remove(priv);
> meson_encoder_cvbs_remove(priv);
>
> @@ -399,6 +407,7 @@ static void meson_drv_unbind(struct device *dev)
> free_irq(priv->vsync_irq, drm);
> drm_dev_put(drm);
>
> + meson_encoder_dsi_remove(priv);
> meson_encoder_hdmi_remove(priv);
> meson_encoder_cvbs_remove(priv);
>
> diff --git a/drivers/gpu/drm/meson/meson_drv.h b/drivers/gpu/drm/meson/meson_drv.h
> index c62ee358456f..b23009a3380f 100644
> --- a/drivers/gpu/drm/meson/meson_drv.h
> +++ b/drivers/gpu/drm/meson/meson_drv.h
> @@ -28,6 +28,7 @@ enum vpu_compatible {
> enum {
> MESON_ENC_CVBS = 0,
> MESON_ENC_HDMI,
> + MESON_ENC_DSI,
> MESON_ENC_LAST,
> };
>
> 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..812e172dec63
> --- /dev/null
> +++ b/drivers/gpu/drm/meson/meson_encoder_dsi.c
> @@ -0,0 +1,174 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (C) 2016 BayLibre, SAS
> + * Author: Neil Armstrong <narmstrong@baylibre.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_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 drm_atomic_state *state = bridge_state->base.state;
> + struct meson_drm *priv = encoder_dsi->priv;
> + struct drm_connector_state *conn_state;
> + struct drm_crtc_state *crtc_state;
> + struct drm_connector *connector;
> +
> + connector = drm_atomic_get_new_connector_for_encoder(state, bridge->encoder);
> + if (WARN_ON(!connector))
> + return;
> +
> + conn_state = drm_atomic_get_new_connector_state(state, connector);
> + if (WARN_ON(!conn_state))
> + return;
> +
> + crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
> + if (WARN_ON(!crtc_state))
> + return;
> +
> + /* ENCL clock setup is handled by CCF */
> +
> + meson_venc_mipi_dsi_mode_set(priv, &crtc_state->adjusted_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));
> +
> + 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,
> + .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\n");
> + 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]
> + */
> +
> + priv->encoders[MESON_ENC_DSI] = meson_encoder_dsi;
> +
> + dev_dbg(priv->dev, "DSI encoder initialized\n");
> +
> + return 0;
> +}
> +
> +void meson_encoder_dsi_remove(struct meson_drm *priv)
> +{
> + struct meson_encoder_dsi *meson_encoder_dsi;
> +
> + if (priv->encoders[MESON_ENC_DSI]) {
> + meson_encoder_dsi = priv->encoders[MESON_ENC_DSI];
> + drm_bridge_remove(&meson_encoder_dsi->bridge);
> + drm_bridge_remove(meson_encoder_dsi->next_bridge);
> + }
> +}
> diff --git a/drivers/gpu/drm/meson/meson_encoder_dsi.h b/drivers/gpu/drm/meson/meson_encoder_dsi.h
> new file mode 100644
> index 000000000000..9277d7015193
> --- /dev/null
> +++ b/drivers/gpu/drm/meson/meson_encoder_dsi.h
> @@ -0,0 +1,13 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later */
> +/*
> + * Copyright (C) 2021 BayLibre, SAS
> + * Author: Neil Armstrong <narmstrong@baylibre.com>
> + */
> +
> +#ifndef __MESON_ENCODER_DSI_H
> +#define __MESON_ENCODER_DSI_H
> +
> +int meson_encoder_dsi_init(struct meson_drm *priv);
> +void meson_encoder_dsi_remove(struct meson_drm *priv);
> +
> +#endif /* __MESON_ENCODER_DSI_H */
>
> --
> 2.34.1
>
Reviewed-by: Nicolas Belin <nbelin@baylibre.com>
Tested-by: Nicolas Belin <nbelin@baylibre.com> # on Khadas VIM3 + TS050 Panel

Thanks,
Nicolas