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Date: Mon, 24 Jun 2024 11:25:21 +0200
From: Maxime Ripard <mripard@...nel.org>
To: Keith Zhao <keith.zhao@...rfivetech.com>
Cc: "andrzej.hajda@...el.com" <andrzej.hajda@...el.com>,
"neil.armstrong@...aro.org" <neil.armstrong@...aro.org>, "rfoss@...nel.org" <rfoss@...nel.org>,
"Laurent.pinchart@...asonboard.com" <Laurent.pinchart@...asonboard.com>, "jonas@...boo.se" <jonas@...boo.se>,
"jernej.skrabec@...il.com" <jernej.skrabec@...il.com>,
"maarten.lankhorst@...ux.intel.com" <maarten.lankhorst@...ux.intel.com>, "tzimmermann@...e.de" <tzimmermann@...e.de>,
"airlied@...il.com" <airlied@...il.com>, "daniel@...ll.ch" <daniel@...ll.ch>,
"robh@...nel.org" <robh@...nel.org>, "krzk+dt@...nel.org" <krzk+dt@...nel.org>,
"conor+dt@...nel.org" <conor+dt@...nel.org>, "hjc@...k-chips.com" <hjc@...k-chips.com>,
"heiko@...ech.de" <heiko@...ech.de>, "andy.yan@...k-chips.com" <andy.yan@...k-chips.com>,
Xingyu Wu <xingyu.wu@...rfivetech.com>, "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
Jack Zhu <jack.zhu@...rfivetech.com>, Shengyang Chen <shengyang.chen@...rfivetech.com>,
"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>, "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 03/10] drm/rockchip:hdmi: migrate to use inno-hdmi
bridge driver
On Sun, Jun 23, 2024 at 07:17:14AM GMT, Keith Zhao wrote:
> Hi Maxime：
>
>
> > -----Original Message-----
> > From: Maxime Ripard <mripard@...nel.org>
> > Sent: 2024年5月22日 15:25
> > To: Keith Zhao <keith.zhao@...rfivetech.com>
> > Cc: andrzej.hajda@...el.com; neil.armstrong@...aro.org; rfoss@...nel.org;
> > Laurent.pinchart@...asonboard.com; jonas@...boo.se;
> > jernej.skrabec@...il.com; maarten.lankhorst@...ux.intel.com;
> > tzimmermann@...e.de; airlied@...il.com; daniel@...ll.ch; robh@...nel.org;
> > krzk+dt@...nel.org; conor+dt@...nel.org; hjc@...k-chips.com;
> > heiko@...ech.de; andy.yan@...k-chips.com; Xingyu Wu
> > <xingyu.wu@...rfivetech.com>; p.zabel@...gutronix.de; Jack Zhu
> > <jack.zhu@...rfivetech.com>; Shengyang Chen
> > <shengyang.chen@...rfivetech.com>; dri-devel@...ts.freedesktop.org;
> > devicetree@...r.kernel.org; linux-kernel@...r.kernel.org;
> > linux-arm-kernel@...ts.infradead.org
> > Subject: Re: [PATCH v4 03/10] drm/rockchip:hdmi: migrate to use inno-hdmi
> > bridge driver
> >
> > Hi,
> >
> > On Tue, May 21, 2024 at 06:58:10PM GMT, keith wrote:
> > > Add the ROCKCHIP inno hdmi driver that uses the Inno DesignWare HDMI
> > > TX bridge and remove the old separate one.
> > >
> > > Signed-off-by: keith <keith.zhao@...rfivetech.com>
> > > ---
> > > drivers/gpu/drm/rockchip/Kconfig | 1 +
> > > drivers/gpu/drm/rockchip/Makefile | 2 +-
> > > drivers/gpu/drm/rockchip/inno_hdmi-rockchip.c | 517 ++++++++
> > > .../{inno_hdmi.h => inno_hdmi-rockchip.h} | 45 -
> > > drivers/gpu/drm/rockchip/inno_hdmi.c | 1073 -----------------
> > > 5 files changed, 519 insertions(+), 1119 deletions(-) create mode
> > > 100644 drivers/gpu/drm/rockchip/inno_hdmi-rockchip.c
> > > rename drivers/gpu/drm/rockchip/{inno_hdmi.h => inno_hdmi-rockchip.h}
> > > (85%) delete mode 100644 drivers/gpu/drm/rockchip/inno_hdmi.c
> > >
> > > diff --git a/drivers/gpu/drm/rockchip/Kconfig
> > > b/drivers/gpu/drm/rockchip/Kconfig
> > > index 1bf3e2829cd0..cc6cfd5a30d6 100644
> > > --- a/drivers/gpu/drm/rockchip/Kconfig
> > > +++ b/drivers/gpu/drm/rockchip/Kconfig
> > > @@ -74,6 +74,7 @@ config ROCKCHIP_DW_MIPI_DSI
> > >
> > > config ROCKCHIP_INNO_HDMI
> > > bool "Rockchip specific extensions for Innosilicon HDMI"
> > > + select DRM_INNO_HDMI
> > > help
> > > This selects support for Rockchip SoC specific extensions
> > > for the Innosilicon HDMI driver. If you want to enable diff --git
> > > a/drivers/gpu/drm/rockchip/Makefile
> > > b/drivers/gpu/drm/rockchip/Makefile
> > > index 3ff7b21c0414..4b2d0cba8db3 100644
> > > --- a/drivers/gpu/drm/rockchip/Makefile
> > > +++ b/drivers/gpu/drm/rockchip/Makefile
> > > @@ -12,7 +12,7 @@ rockchipdrm-$(CONFIG_ROCKCHIP_ANALOGIX_DP) +=
> > > analogix_dp-rockchip.o
> > > rockchipdrm-$(CONFIG_ROCKCHIP_CDN_DP) += cdn-dp-core.o cdn-dp-reg.o
> > > rockchipdrm-$(CONFIG_ROCKCHIP_DW_HDMI) += dw_hdmi-rockchip.o
> > > rockchipdrm-$(CONFIG_ROCKCHIP_DW_MIPI_DSI) +=
> > dw-mipi-dsi-rockchip.o
> > > -rockchipdrm-$(CONFIG_ROCKCHIP_INNO_HDMI) += inno_hdmi.o
> > > +rockchipdrm-$(CONFIG_ROCKCHIP_INNO_HDMI) += inno_hdmi-rockchip.o
> > > rockchipdrm-$(CONFIG_ROCKCHIP_LVDS) += rockchip_lvds.o
> > > rockchipdrm-$(CONFIG_ROCKCHIP_RGB) += rockchip_rgb.o
> > > rockchipdrm-$(CONFIG_ROCKCHIP_RK3066_HDMI) += rk3066_hdmi.o diff
> > > --git a/drivers/gpu/drm/rockchip/inno_hdmi-rockchip.c
> > > b/drivers/gpu/drm/rockchip/inno_hdmi-rockchip.c
> > > new file mode 100644
> > > index 000000000000..69d0e913e13b
> > > --- /dev/null
> > > +++ b/drivers/gpu/drm/rockchip/inno_hdmi-rockchip.c
> > > @@ -0,0 +1,517 @@
> > > +// SPDX-License-Identifier: GPL-2.0-only
> > > +/*
> > > + * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd
> > > + * Zheng Yang <zhengyang@...k-chips.com>
> > > + * Yakir Yang <ykk@...k-chips.com>
> > > + */
> > > +
> > > +#include <linux/irq.h>
> > > +#include <linux/clk.h>
> > > +#include <linux/delay.h>
> > > +#include <linux/err.h>
> > > +#include <linux/hdmi.h>
> > > +#include <linux/mod_devicetable.h>
> > > +#include <linux/module.h>
> > > +#include <linux/mutex.h>
> > > +#include <linux/platform_device.h>
> > > +
> > > +#include <drm/bridge/inno_hdmi.h>
> > > +#include <drm/drm_atomic.h>
> > > +#include <drm/drm_atomic_helper.h>
> > > +#include <drm/drm_edid.h>
> > > +#include <drm/drm_of.h>
> > > +#include <drm/drm_probe_helper.h>
> > > +#include <drm/drm_simple_kms_helper.h>
> > > +
> > > +#include "rockchip_drm_drv.h"
> > > +
> > > +#include "inno_hdmi-rockchip.h"
> > > +
> > > +#define INNO_HDMI_MIN_TMDS_CLOCK 25000000U
> > > +
> > > +struct rk_inno_hdmi {
> > > + struct rockchip_encoder encoder;
> > > + struct inno_hdmi inno_hdmi;
> > > + struct clk *pclk;
> > > + struct clk *refclk;
> > > +};
> > > +
> > > +static struct inno_hdmi *rk_encoder_to_inno_hdmi(struct drm_encoder
> > > +*encoder) {
> > > + struct rockchip_encoder *rkencoder = to_rockchip_encoder(encoder);
> > > + struct rk_inno_hdmi *rk_hdmi = container_of(rkencoder, struct
> > > +rk_inno_hdmi, encoder);
> > > +
> > > + return &rk_hdmi->inno_hdmi;
> > > +}
> > > +
> > > +enum {
> > > + CSC_RGB_0_255_TO_ITU601_16_235_8BIT,
> > > + CSC_RGB_0_255_TO_ITU709_16_235_8BIT,
> > > + CSC_RGB_0_255_TO_RGB_16_235_8BIT,
> > > +};
> > > +
> > > +static const char coeff_csc[][24] = {
> > > + /*
> > > + * RGB2YUV:601 SD mode:
> > > + * Cb = -0.291G - 0.148R + 0.439B + 128
> > > + * Y = 0.504G + 0.257R + 0.098B + 16
> > > + * Cr = -0.368G + 0.439R - 0.071B + 128
> > > + */
> > > + {
> > > + 0x11, 0x5f, 0x01, 0x82, 0x10, 0x23, 0x00, 0x80,
> > > + 0x02, 0x1c, 0x00, 0xa1, 0x00, 0x36, 0x00, 0x1e,
> > > + 0x11, 0x29, 0x10, 0x59, 0x01, 0x82, 0x00, 0x80
> > > + },
> > > + /*
> > > + * RGB2YUV:709 HD mode:
> > > + * Cb = - 0.338G - 0.101R + 0.439B + 128
> > > + * Y = 0.614G + 0.183R + 0.062B + 16
> > > + * Cr = - 0.399G + 0.439R - 0.040B + 128
> > > + */
> > > + {
> > > + 0x11, 0x98, 0x01, 0xc1, 0x10, 0x28, 0x00, 0x80,
> > > + 0x02, 0x74, 0x00, 0xbb, 0x00, 0x3f, 0x00, 0x10,
> > > + 0x11, 0x5a, 0x10, 0x67, 0x01, 0xc1, 0x00, 0x80
> > > + },
> > > + /*
> > > + * RGB[0:255]2RGB[16:235]:
> > > + * R' = R x (235-16)/255 + 16;
> > > + * G' = G x (235-16)/255 + 16;
> > > + * B' = B x (235-16)/255 + 16;
> > > + */
> > > + {
> > > + 0x00, 0x00, 0x03, 0x6F, 0x00, 0x00, 0x00, 0x10,
> > > + 0x03, 0x6F, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10,
> > > + 0x00, 0x00, 0x00, 0x00, 0x03, 0x6F, 0x00, 0x10
> > > + },
> > > +};
> > > +
> > > +static struct inno_hdmi_phy_config rk3036_hdmi_phy_configs[] = {
> > > + { 74250000, 0x3f, 0xbb },
> > > + { 165000000, 0x6f, 0xbb },
> > > + { ~0UL, 0x00, 0x00 }
> > > +};
> > > +
> > > +static struct inno_hdmi_phy_config rk3128_hdmi_phy_configs[] = {
> > > + { 74250000, 0x3f, 0xaa },
> > > + { 165000000, 0x5f, 0xaa },
> > > + { ~0UL, 0x00, 0x00 }
> > > +};
> > > +
> > > +static int inno_hdmi_find_phy_config(struct inno_hdmi *hdmi,
> > > + unsigned long pixelclk)
> > > +{
> > > + const struct inno_hdmi_phy_config *phy_configs =
> > hdmi->plat_data->phy_configs;
> > > + int i;
> > > +
> > > + for (i = 0; phy_configs[i].pixelclock != ~0UL; i++) {
> > > + if (pixelclk <= phy_configs[i].pixelclock)
> > > + return i;
> > > + }
> > > +
> > > + DRM_DEV_DEBUG(hdmi->dev, "No phy configuration for pixelclock %lu\n",
> > > + pixelclk);
> > > +
> > > + return -EINVAL;
> > > +}
> > > +
> > > +static void inno_hdmi_standby(struct inno_hdmi *hdmi) {
> > > + inno_hdmi_sys_power(hdmi, false);
> > > +
> > > + hdmi_writeb(hdmi, HDMI_PHY_DRIVER, 0x00);
> > > + hdmi_writeb(hdmi, HDMI_PHY_PRE_EMPHASIS, 0x00);
> > > + hdmi_writeb(hdmi, HDMI_PHY_CHG_PWR, 0x00);
> > > + hdmi_writeb(hdmi, HDMI_PHY_SYS_CTL, 0x15); };
> > > +
> > > +static void inno_hdmi_power_up(struct inno_hdmi *hdmi,
> > > + unsigned long mpixelclock)
> > > +{
> > > + struct inno_hdmi_phy_config *phy_config;
> > > + int ret = inno_hdmi_find_phy_config(hdmi, mpixelclock);
> > > +
> > > + if (ret < 0) {
> > > + phy_config = hdmi->plat_data->default_phy_config;
> > > + DRM_DEV_ERROR(hdmi->dev,
> > > + "Using default phy configuration for TMDS rate %lu",
> > > + mpixelclock);
> > > + } else {
> > > + phy_config = &hdmi->plat_data->phy_configs[ret];
> > > + }
> > > +
> > > + inno_hdmi_sys_power(hdmi, false);
> > > +
> > > + hdmi_writeb(hdmi, HDMI_PHY_PRE_EMPHASIS,
> > phy_config->pre_emphasis);
> > > + hdmi_writeb(hdmi, HDMI_PHY_DRIVER,
> > phy_config->voltage_level_control);
> > > + hdmi_writeb(hdmi, HDMI_PHY_SYS_CTL, 0x15);
> > > + hdmi_writeb(hdmi, HDMI_PHY_SYS_CTL, 0x14);
> > > + hdmi_writeb(hdmi, HDMI_PHY_SYS_CTL, 0x10);
> > > + hdmi_writeb(hdmi, HDMI_PHY_CHG_PWR, 0x0f);
> > > + hdmi_writeb(hdmi, HDMI_PHY_SYNC, 0x00);
> > > + hdmi_writeb(hdmi, HDMI_PHY_SYNC, 0x01);
> > > +
> > > + inno_hdmi_sys_power(hdmi, true);
> > > +};
> > > +
> > > +static void inno_hdmi_reset(struct inno_hdmi *hdmi) {
> > > + u32 val;
> > > + u32 msk;
> > > +
> > > + hdmi_modb(hdmi, HDMI_SYS_CTRL, m_RST_DIGITAL,
> > v_NOT_RST_DIGITAL);
> > > + udelay(100);
> > > +
> > > + hdmi_modb(hdmi, HDMI_SYS_CTRL, m_RST_ANALOG,
> > v_NOT_RST_ANALOG);
> > > + udelay(100);
> > > +
> > > + msk = m_REG_CLK_INV | m_REG_CLK_SOURCE | m_POWER | m_INT_POL;
> > > + val = v_REG_CLK_INV | v_REG_CLK_SOURCE_SYS | v_PWR_ON |
> > v_INT_POL_HIGH;
> > > + hdmi_modb(hdmi, HDMI_SYS_CTRL, msk, val);
> > > +
> > > + inno_hdmi_standby(hdmi);
> > > +}
> > > +
> > > +static int inno_hdmi_config_video_csc(struct inno_hdmi *hdmi) {
> > > + struct drm_connector *connector = &hdmi->connector;
> > > + struct drm_connector_state *conn_state = connector->state;
> > > + struct inno_hdmi_connector_state *inno_conn_state =
> > > + to_inno_hdmi_conn_state(conn_state);
> > > + int c0_c2_change = 0;
> > > + int csc_enable = 0;
> > > + int csc_mode = 0;
> > > + int auto_csc = 0;
> > > + int value;
> > > + int i;
> > > +
> > > + /* Input video mode is SDR RGB24bit, data enable signal from external */
> > > + hdmi_writeb(hdmi, HDMI_VIDEO_CONTRL1, v_DE_EXTERNAL |
> > > + v_VIDEO_INPUT_FORMAT(VIDEO_INPUT_SDR_RGB444));
> > > +
> > > + /* Input color hardcode to RGB, and output color hardcode to RGB888 */
> > > + value = v_VIDEO_INPUT_BITS(VIDEO_INPUT_8BITS) |
> > > + v_VIDEO_OUTPUT_COLOR(0) |
> > > + v_VIDEO_INPUT_CSP(0);
> > > + hdmi_writeb(hdmi, HDMI_VIDEO_CONTRL2, value);
> > > +
> > > + if (inno_conn_state->enc_out_format == HDMI_COLORSPACE_RGB) {
> > > + if (inno_conn_state->rgb_limited_range) {
> > > + csc_mode = CSC_RGB_0_255_TO_RGB_16_235_8BIT;
> > > + auto_csc = AUTO_CSC_DISABLE;
> > > + c0_c2_change = C0_C2_CHANGE_DISABLE;
> > > + csc_enable = v_CSC_ENABLE;
> > > +
> > > + } else {
> > > + value = v_SOF_DISABLE | v_COLOR_DEPTH_NOT_INDICATED(1);
> > > + hdmi_writeb(hdmi, HDMI_VIDEO_CONTRL3, value);
> > > +
> > > + hdmi_modb(hdmi, HDMI_VIDEO_CONTRL,
> > > + m_VIDEO_AUTO_CSC | m_VIDEO_C0_C2_SWAP,
> > > + v_VIDEO_AUTO_CSC(AUTO_CSC_DISABLE) |
> > > + v_VIDEO_C0_C2_SWAP(C0_C2_CHANGE_DISABLE));
> > > + return 0;
> > > + }
> > > + } else {
> > > + if (inno_conn_state->colorimetry == HDMI_COLORIMETRY_ITU_601)
> > {
> > > + if (inno_conn_state->enc_out_format ==
> > HDMI_COLORSPACE_YUV444) {
> > > + csc_mode = CSC_RGB_0_255_TO_ITU601_16_235_8BIT;
> > > + auto_csc = AUTO_CSC_DISABLE;
> > > + c0_c2_change = C0_C2_CHANGE_DISABLE;
> > > + csc_enable = v_CSC_ENABLE;
> > > + }
> > > + } else {
> > > + if (inno_conn_state->enc_out_format ==
> > HDMI_COLORSPACE_YUV444) {
> > > + csc_mode = CSC_RGB_0_255_TO_ITU709_16_235_8BIT;
> > > + auto_csc = AUTO_CSC_DISABLE;
> > > + c0_c2_change = C0_C2_CHANGE_DISABLE;
> > > + csc_enable = v_CSC_ENABLE;
> > > + }
> > > + }
> > > + }
> > > +
> > > + for (i = 0; i < 24; i++)
> > > + hdmi_writeb(hdmi, HDMI_VIDEO_CSC_COEF + i,
> > > + coeff_csc[csc_mode][i]);
> > > +
> > > + value = v_SOF_DISABLE | csc_enable |
> > v_COLOR_DEPTH_NOT_INDICATED(1);
> > > + hdmi_writeb(hdmi, HDMI_VIDEO_CONTRL3, value);
> > > + hdmi_modb(hdmi, HDMI_VIDEO_CONTRL, m_VIDEO_AUTO_CSC |
> > > + m_VIDEO_C0_C2_SWAP, v_VIDEO_AUTO_CSC(auto_csc) |
> > > + v_VIDEO_C0_C2_SWAP(c0_c2_change));
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static int inno_hdmi_setup(struct inno_hdmi *hdmi,
> > > + struct drm_display_mode *mode)
> > > +{
> > > + struct drm_display_info *display = &hdmi->connector.display_info;
> > > + unsigned long mpixelclock = mode->clock * 1000;
> > > +
> > > + /* Mute video and audio output */
> > > + hdmi_modb(hdmi, HDMI_AV_MUTE, m_AUDIO_MUTE | m_VIDEO_BLACK,
> > > + v_AUDIO_MUTE(1) | v_VIDEO_MUTE(1));
> > > +
> > > + /* Set HDMI Mode */
> > > + hdmi_writeb(hdmi, HDMI_HDCP_CTRL,
> > > + v_HDMI_DVI(display->is_hdmi));
> > > +
> > > + inno_hdmi_config_video_timing(hdmi, mode);
> > > +
> > > + inno_hdmi_config_video_csc(hdmi);
> > > +
> > > + if (display->is_hdmi)
> > > + inno_hdmi_config_video_avi(hdmi, mode);
> > > +
> > > + /*
> > > + * When IP controller have configured to an accurate video
> > > + * timing, then the TMDS clock source would be switched to
> > > + * DCLK_LCDC, so we need to init the TMDS rate to mode pixel
> > > + * clock rate, and reconfigure the DDC clock.
> > > + */
> > > + inno_hdmi_i2c_init(hdmi, mpixelclock);
> > > +
> > > + /* Unmute video and audio output */
> > > + hdmi_modb(hdmi, HDMI_AV_MUTE, m_AUDIO_MUTE | m_VIDEO_BLACK,
> > > + v_AUDIO_MUTE(0) | v_VIDEO_MUTE(0));
> > > +
> > > + inno_hdmi_power_up(hdmi, mpixelclock);
> > > +
> > > + return 0;
> > > +}
> > >
> >
> > It's kind of a general comment, but I don't think that's the right abstraction. You
> > should create a inno_hdmi bridge that allows to supplement some of the atomic
> > hooks, but not reimplement them entirely each time.
> >
> > You can have a look at how dw-hdmi does it for example. Also, why do you still
> > need the encoder and connectors?
> >
> Hi Maxime：
> This series of patches does not consider referencing bridge ,
> just split the public interface based on the current structure (encoder + connector),
> and then make it into a public API.
> The next step is to implement the driver code of the public part based on the bridge architecture.
I'm not sure what you have in mind, but I stand by what I was saying
previously. SoC-specific drivers shouldn't have code to handle the
common part of the bridge, it should be the other way around: the common
part should add hooks to handle the SoC-specific parts.
> By the way, does the current situation require the introduction of the next_bridge concept?
> dw-hdmi attach:
> static int dw_hdmi_bridge_attach(struct drm_bridge *bridge,
> enum drm_bridge_attach_flags flags)
> {
> struct dw_hdmi *hdmi = bridge->driver_private;
>
> if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)
> return drm_bridge_attach(bridge->encoder, hdmi->next_bridge,
> bridge, flags);
>
> return dw_hdmi_connector_create(hdmi);
> }
>
> For inno hdmi , I want to define it like this , will it be ok?
> static int inno_bridge_attach(struct drm_bridge *bridge,
> enum drm_bridge_attach_flags flags)
> {
> ......
>
> if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
> DRM_ERROR("Fix bridge driver to make connector optional!");
> return -EINVAL;
> }
>
> return 0;
> }
> ......
> And then , create the connector outside of bridge:
> ret = drm_bridge_attach(encoder, &hdmi->bridge, NULL, 0);
> if (ret)
> return ret;
>
> hdmi->connector = drm_bridge_connector_init(drm, encoder);
> if (IS_ERR(hdmi->connector)) {
> dev_err(dev, "Unable to create bridge connector\n");
> ret = PTR_ERR(hdmi->connector);
> return ret;
> }
Yes, it looks reasonable as long as you don't break old drivers.
Maxime
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