Message-ID: <9223210.CDJkKcVGEf@steina-w>
Date: Wed, 17 Jan 2024 10:46:49 +0100
From: Alexander Stein <alexander.stein@...tq-group.com>
To: dmitry.baryshkov@...aro.org, andrzej.hajda@...el.com, neil.armstrong@...aro.org, Laurent.pinchart@...asonboard.com, jonas@...boo.se, jernej.skrabec@...il.com, airlied@...il.com, daniel@...ll.ch, robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org, shawnguo@...nel.org, s.hauer@...gutronix.de, festevam@...il.com, vkoul@...nel.org, dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org, Sandor Yu <Sandor.yu@....com>
Cc: kernel@...gutronix.de, linux-imx@....com, Sandor.yu@....com, oliver.brown@....com, sam@...nborg.org
Subject: Re: [PATCH v12 4/7] drm: bridge: Cadence: Add MHDP8501 DP/HDMI driver

Hi Sandor,

thanks for the update.

Am Mittwoch, 10. Januar 2024, 02:08:45 CET schrieb Sandor Yu:
> Add a new DRM DisplayPort and HDMI bridge driver for Candence MHDP8501
> used in i.MX8MQ SOC. MHDP8501 could support HDMI or DisplayPort
> standards according embedded Firmware running in the uCPU.
> 
> For iMX8MQ SOC, the DisplayPort/HDMI FW was loaded and activated by
> SOC's ROM code. Bootload binary included respective specific firmware
> is required.
> 
> Driver will check display connector type and
> then load the corresponding driver.
> 
> Signed-off-by: Sandor Yu <Sandor.yu@....com>
> Tested-by: Alexander Stein <alexander.stein@...tq-group.com>
> ---
> v11->v12:
> - Replace DRM_INFO with dev_info or dev_warn.
> - Replace DRM_ERROR with dev_err.
> - Return ret when cdns_mhdp_dpcd_read failed in function
> cdns_dp_aux_transferi(). - Remove unused parmeter in function
> cdns_dp_get_msa_misc
>   and use two separate variables for color space and bpc.
> - Add year 2024 to copyright.
> 
>  drivers/gpu/drm/bridge/cadence/Kconfig        |  16 +
>  drivers/gpu/drm/bridge/cadence/Makefile       |   2 +
>  .../drm/bridge/cadence/cdns-mhdp8501-core.c   | 315 ++++++++
>  .../drm/bridge/cadence/cdns-mhdp8501-core.h   | 365 +++++++++
>  .../gpu/drm/bridge/cadence/cdns-mhdp8501-dp.c | 699 ++++++++++++++++++
>  .../drm/bridge/cadence/cdns-mhdp8501-hdmi.c   | 678 +++++++++++++++++
>  6 files changed, 2075 insertions(+)
>  create mode 100644 drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-core.c
>  create mode 100644 drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-core.h
>  create mode 100644 drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-dp.c
>  create mode 100644 drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-hdmi.c
> 
> diff --git a/drivers/gpu/drm/bridge/cadence/Kconfig
> b/drivers/gpu/drm/bridge/cadence/Kconfig index e0973339e9e33..45848e741f5f4
> 100644
> --- a/drivers/gpu/drm/bridge/cadence/Kconfig
> +++ b/drivers/gpu/drm/bridge/cadence/Kconfig
> @@ -51,3 +51,19 @@ config DRM_CDNS_MHDP8546_J721E
>  	  initializes the J721E Display Port and sets up the
>  	  clock and data muxes.
>  endif
> +
> +config DRM_CDNS_MHDP8501
> +	tristate "Cadence MHDP8501 DP/HDMI bridge"
> +	select DRM_KMS_HELPER
> +	select DRM_PANEL_BRIDGE
> +	select DRM_DISPLAY_DP_HELPER
> +	select DRM_DISPLAY_HELPER
> +	select CDNS_MHDP_HELPER
> +	select DRM_CDNS_AUDIO
> +	depends on OF
> +	help
> +	  Support Cadence MHDP8501 DisplayPort/HDMI bridge.
> +	  Cadence MHDP8501 support one or more protocols,
> +	  including DisplayPort and HDMI.
> +	  To use the DP and HDMI drivers, their respective
> +	  specific firmware is required.
> diff --git a/drivers/gpu/drm/bridge/cadence/Makefile
> b/drivers/gpu/drm/bridge/cadence/Makefile index
> 087dc074820d7..02c1a9f3cf6fc 100644
> --- a/drivers/gpu/drm/bridge/cadence/Makefile
> +++ b/drivers/gpu/drm/bridge/cadence/Makefile
> @@ -6,3 +6,5 @@ obj-$(CONFIG_CDNS_MHDP_HELPER) += cdns-mhdp-helper.o
>  obj-$(CONFIG_DRM_CDNS_MHDP8546) += cdns-mhdp8546.o
>  cdns-mhdp8546-y := cdns-mhdp8546-core.o cdns-mhdp8546-hdcp.o
>  cdns-mhdp8546-$(CONFIG_DRM_CDNS_MHDP8546_J721E) += cdns-mhdp8546-j721e.o
> +obj-$(CONFIG_DRM_CDNS_MHDP8501) += cdns-mhdp8501.o
> +cdns-mhdp8501-y := cdns-mhdp8501-core.o cdns-mhdp8501-dp.o
> cdns-mhdp8501-hdmi.o diff --git
> a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-core.c
> b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-core.c new file mode 100644
> index 0000000000000..3080c7507a012
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-core.c
> @@ -0,0 +1,315 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Cadence Display Port Interface (DP) driver
> + *
> + * Copyright (C) 2023, 2024 NXP Semiconductor, Inc.
> + *
> + */
> +#include <drm/drm_of.h>
> +#include <drm/drm_print.h>
> +#include <linux/clk.h>
> +#include <linux/irq.h>
> +#include <linux/mutex.h>
> +#include <linux/of_device.h>

Since commit d57d584ef69de ("of: Stop circularly including of_device.h and 
of_platform.h") you to explicitly include linux/platform_device.h here. Please 
compile against next tree.

> +#include <linux/phy/phy.h>
> +
> +#include "cdns-mhdp8501-core.h"
> +
> [snip]
> diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-dp.c
> b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-dp.c new file mode 100644
> index 0000000000000..6963c7143a3b0
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-dp.c
> @@ -0,0 +1,699 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Cadence MHDP8501 DisplayPort(DP) bridge driver
> + *
> + * Copyright (C) 2019-2024 NXP Semiconductor, Inc.
> + *
> + */
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_edid.h>
> +#include <drm/drm_print.h>
> +#include <linux/phy/phy.h>
> +#include <linux/phy/phy-dp.h>
> +
> +#include "cdns-mhdp8501-core.h"
> +
> +#define LINK_TRAINING_TIMEOUT_MS	500
> +#define LINK_TRAINING_RETRY_MS		20
> +
> +ssize_t cdns_dp_aux_transfer(struct drm_dp_aux *aux,
> +			     struct drm_dp_aux_msg *msg)
> +{
> +	struct cdns_mhdp8501_device *mhdp = dev_get_drvdata(aux->dev);
> +	bool native = msg->request & (DP_AUX_NATIVE_WRITE & 
DP_AUX_NATIVE_READ);
> +	int ret;
> +
> +	/* Ignore address only message */
> +	if (!msg->size || !msg->buffer) {
> +		msg->reply = native ?
> +			DP_AUX_NATIVE_REPLY_ACK : DP_AUX_I2C_REPLY_ACK;
> +		return msg->size;
> +	}
> +
> +	if (!native) {
> +		dev_err(mhdp->dev, "%s: only native messages supported\n", 
__func__);
> +		return -EINVAL;
> +	}
> +
> +	/* msg sanity check */
> +	if (msg->size > DP_AUX_MAX_PAYLOAD_BYTES) {
> +		dev_err(mhdp->dev, "%s: invalid msg: size(%zu), 
request(%x)\n",
> +			__func__, msg->size, (unsigned int)msg-
>request);
> +		return -EINVAL;
> +	}
> +
> +	if (msg->request == DP_AUX_NATIVE_WRITE) {
> +		const u8 *buf = msg->buffer;
> +		int i;
> +
> +		for (i = 0; i < msg->size; ++i) {
> +			ret = cdns_mhdp_dpcd_write(&mhdp->base,
> +						   msg->address + 
i, buf[i]);
> +			if (ret < 0) {
> +				dev_err(mhdp->dev, "Failed to write 
DPCD\n");
> +				return ret;
> +			}
> +		}
> +		msg->reply = DP_AUX_NATIVE_REPLY_ACK;
> +		return msg->size;
> +	}
> +
> +	if (msg->request == DP_AUX_NATIVE_READ) {
> +		ret = cdns_mhdp_dpcd_read(&mhdp->base, msg->address,
> +					  msg->buffer, msg->size);
> +		if (ret < 0)
> +			return ret;
> +		msg->reply = DP_AUX_NATIVE_REPLY_ACK;
> +		return msg->size;
> +	}
> +	return 0;
> +}
> +
> +int cdns_dp_aux_destroy(struct cdns_mhdp8501_device *mhdp)
> +{
> +	drm_dp_aux_unregister(&mhdp->dp.aux);
> +
> +	return 0;
> +}
> +
> +static int cdns_dp_get_msa_misc(struct video_info *video)
> +{
> +	u32 msa_misc;
> +	u8 color_space = 0;
> +	u8 bpc = 0;
> +
> +	switch (video->color_fmt) {
> +	/* set YUV default color space conversion to BT601 */
> +	case DRM_COLOR_FORMAT_YCBCR444:
> +		color_space = 6 + BT_601 * 8;
> +		break;
> +	case DRM_COLOR_FORMAT_YCBCR422:
> +		color_space = 5 + BT_601 * 8;
> +		break;
> +	case DRM_COLOR_FORMAT_YCBCR420:
> +		color_space = 5;
> +		break;
> +	case DRM_COLOR_FORMAT_RGB444:
> +	default:
> +		color_space = 0;
> +		break;
> +	};
> +
> +	switch (video->bpc) {
> +	case 6:
> +		bpc = 0;
> +		break;
> +	case 10:
> +		bpc = 2;
> +		break;
> +	case 12:
> +		bpc = 3;
> +		break;
> +	case 16:
> +		bpc = 4;
> +		break;
> +	case 8:
> +	default:
> +		bpc = 1;
> +		break;
> +	};
> +
> +	msa_misc = (color_space << 1) | (bpc << 5);

This looks much nicer, thanks. But please order them in descending shift 
width: bpc first then color_space.

> +
> +	return msa_misc;
> +}
> +
> [snip]
> +int cdns_dp_set_host_cap(struct cdns_mhdp8501_device *mhdp)

This can be made static.

> +{
> +	u8 msg[8];
> +	int ret;
> +
> +	msg[0] = drm_dp_link_rate_to_bw_code(mhdp->dp.rate);
> +	msg[1] = mhdp->dp.num_lanes | SCRAMBLER_EN;
> +	msg[2] = VOLTAGE_LEVEL_2;
> +	msg[3] = PRE_EMPHASIS_LEVEL_3;
> +	msg[4] = PTS1 | PTS2 | PTS3 | PTS4;
> +	msg[5] = FAST_LT_NOT_SUPPORT;
> +	msg[6] = mhdp->lane_mapping;
> +	msg[7] = ENHANCED;
> +
> +	mutex_lock(&mhdp->mbox_mutex);
> +
> +	ret = cdns_mhdp_mailbox_send(&mhdp->base, MB_MODULE_ID_DP_TX,
> +				     DPTX_SET_HOST_CAPABILITIES,
> +				     sizeof(msg), msg);
> +
> +	mutex_unlock(&mhdp->mbox_mutex);
> +
> +	if (ret)
> +		dev_err(mhdp->dev, "set host cap failed: %d\n", ret);
> +
> +	return ret;
> +}
> [snip]
> diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-hdmi.c
> b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-hdmi.c new file mode 100644
> index 0000000000000..ae21f7dfe5e94
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8501-hdmi.c
> @@ -0,0 +1,678 @@
> [snip]
> +bool cdns_hdmi_bridge_mode_fixup(struct drm_bridge *bridge,
> +				 const struct drm_display_mode *mode,
> +				 struct drm_display_mode 
*adjusted_mode)

This can be made static.

Thanks and best regards,
Alexander

> +{
> +	struct cdns_mhdp8501_device *mhdp = bridge->driver_private;
> +	struct video_info *video = &mhdp->video_info;
> +
> +	/* The only currently supported format */
> +	video->bpc = 8;
> +	video->color_fmt = DRM_COLOR_FORMAT_RGB444;
> +
> +	return true;
> +}
> +
> +static enum drm_connector_status
> +cdns_hdmi_bridge_detect(struct drm_bridge *bridge)
> +{
> +	struct cdns_mhdp8501_device *mhdp = bridge->driver_private;
> +
> +	return cdns_mhdp8501_detect(mhdp);
> +}
> +
> +static struct edid *cdns_hdmi_bridge_get_edid(struct drm_bridge *bridge,
> +					      struct drm_connector 
*connector)
> +{
> +	struct cdns_mhdp8501_device *mhdp = bridge->driver_private;
> +
> +	return drm_do_get_edid(connector, cdns_hdmi_get_edid_block, mhdp);
> +}
> +
> +static void cdns_hdmi_bridge_atomic_disable(struct drm_bridge *bridge,
> +					    struct drm_bridge_state 
*old_state)
> +{
> +	struct cdns_mhdp8501_device *mhdp = bridge->driver_private;
> +
> +	mhdp->curr_conn = NULL;
> +
> +	/* Mailbox protect for HDMI PHY access */
> +	mutex_lock(&mhdp->mbox_mutex);
> +	phy_power_off(mhdp->phy);
> +	mutex_unlock(&mhdp->mbox_mutex);
> +}
> +
> +static void cdns_hdmi_bridge_atomic_enable(struct drm_bridge *bridge,
> +					   struct drm_bridge_state 
*old_state)
> +{
> +	struct cdns_mhdp8501_device *mhdp = bridge->driver_private;
> +	struct drm_atomic_state *state = old_state->base.state;
> +	struct drm_connector *connector;
> +	struct drm_crtc_state *crtc_state;
> +	struct drm_connector_state *conn_state;
> +	const struct drm_display_mode *mode;
> +
> +	connector = drm_atomic_get_new_connector_for_encoder(state,
> +							     
bridge->encoder);
> +	if (WARN_ON(!connector))
> +		return;
> +
> +	mhdp->curr_conn = connector;
> +
> +	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;
> +
> +	mode = &crtc_state->adjusted_mode;
> +	dev_dbg(mhdp->dev, "Mode: %dx%dp%d\n",
> +		mode->hdisplay, mode->vdisplay, mode->clock);
> +	memcpy(&mhdp->mode, mode, sizeof(struct drm_display_mode));
> +
> +	cdns_hdmi_mode_set(mhdp);
> +}
> +
> +const struct drm_bridge_funcs cdns_hdmi_bridge_funcs = {
> +	.attach = cdns_hdmi_bridge_attach,
> +	.detect = cdns_hdmi_bridge_detect,
> +	.get_edid = cdns_hdmi_bridge_get_edid,
> +	.mode_valid = cdns_hdmi_bridge_mode_valid,
> +	.mode_fixup = cdns_hdmi_bridge_mode_fixup,
> +	.atomic_enable = cdns_hdmi_bridge_atomic_enable,
> +	.atomic_disable = cdns_hdmi_bridge_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,
> +};


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