Re: [PATCH v12 3/4] drm/bridge: anx7625: add MIPI DPI input feature

From: Laurent Pinchart
Date: Sun Mar 06 2022 - 22:30:33 EST

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Hello Xin,

On Mon, Mar 07, 2022 at 11:22:48AM +0800, Xin Ji wrote:
> On Sun, Mar 06, 2022 at 07:13:30PM +0200, Laurent Pinchart wrote:
> > Hello Xin,
> >
> > (Question for Rob below, and I'm afraid this is urgent as we need to
> > merge a fix in v5.17).
> >
> > On Fri, Nov 05, 2021 at 11:19:03AM +0800, Xin Ji wrote:
> > > The basic anx7625 driver only support MIPI DSI rx signal input.
> > > This patch add MIPI DPI rx input configuration support, after apply
> > > this patch, the driver can support DSI rx or DPI rx by adding
> > > 'bus-type' in DT.
> > >
> > > Reviewed-by: Robert Foss <robert.foss@xxxxxxxxxx>
> > > Signed-off-by: Xin Ji <xji@xxxxxxxxxxxxxxxx>
> > > ---
> > > drivers/gpu/drm/bridge/analogix/anx7625.c | 247 ++++++++++++++++------
> > > drivers/gpu/drm/bridge/analogix/anx7625.h | 18 +-
> > > 2 files changed, 205 insertions(+), 60 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
> > > index f48e91134c20..f7c3386c8929 100644
> > > --- a/drivers/gpu/drm/bridge/analogix/anx7625.c
> > > +++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
> > > @@ -32,6 +32,7 @@
> > > #include <drm/drm_print.h>
> > > #include <drm/drm_probe_helper.h>
> > >
> > > +#include <media/v4l2-fwnode.h>
> > > #include <video/display_timing.h>
> > >
> > > #include "anx7625.h"
> > > @@ -152,18 +153,18 @@ static int anx7625_write_and(struct anx7625_data *ctx,
> > > return anx7625_reg_write(ctx, client, offset, (val & (mask)));
> > > }
> > >
> > > -static int anx7625_write_and_or(struct anx7625_data *ctx,
> > > - struct i2c_client *client,
> > > - u8 offset, u8 and_mask, u8 or_mask)
> > > +static int anx7625_config_bit_matrix(struct anx7625_data *ctx)
> > > {
> > > - int val;
> > > + int i, ret;
> > >
> > > - val = anx7625_reg_read(ctx, client, offset);
> > > - if (val < 0)
> > > - return val;
> > > + ret = anx7625_write_or(ctx, ctx->i2c.tx_p2_client,
> > > + AUDIO_CONTROL_REGISTER, 0x80);
> > > + for (i = 0; i < 13; i++)
> > > + ret |= anx7625_reg_write(ctx, ctx->i2c.tx_p2_client,
> > > + VIDEO_BIT_MATRIX_12 + i,
> > > + 0x18 + i);
> > >
> > > - return anx7625_reg_write(ctx, client,
> > > - offset, (val & and_mask) | (or_mask));
> > > + return ret;
> > > }
> > >
> > > static int anx7625_read_ctrl_status_p0(struct anx7625_data *ctx)
> > > @@ -221,38 +222,6 @@ static int anx7625_video_mute_control(struct anx7625_data *ctx,
> > > return ret;
> > > }
> > >
> > > -static int anx7625_config_audio_input(struct anx7625_data *ctx)
> > > -{
> > > - struct device *dev = &ctx->client->dev;
> > > - int ret;
> > > -
> > > - /* Channel num */
> > > - ret = anx7625_reg_write(ctx, ctx->i2c.tx_p2_client,
> > > - AUDIO_CHANNEL_STATUS_6, I2S_CH_2 << 5);
> > > -
> > > - /* FS */
> > > - ret |= anx7625_write_and_or(ctx, ctx->i2c.tx_p2_client,
> > > - AUDIO_CHANNEL_STATUS_4,
> > > - 0xf0, AUDIO_FS_48K);
> > > - /* Word length */
> > > - ret |= anx7625_write_and_or(ctx, ctx->i2c.tx_p2_client,
> > > - AUDIO_CHANNEL_STATUS_5,
> > > - 0xf0, AUDIO_W_LEN_24_24MAX);
> > > - /* I2S */
> > > - ret |= anx7625_write_or(ctx, ctx->i2c.tx_p2_client,
> > > - AUDIO_CHANNEL_STATUS_6, I2S_SLAVE_MODE);
> > > - ret |= anx7625_write_and(ctx, ctx->i2c.tx_p2_client,
> > > - AUDIO_CONTROL_REGISTER, ~TDM_TIMING_MODE);
> > > - /* Audio change flag */
> > > - ret |= anx7625_write_or(ctx, ctx->i2c.rx_p0_client,
> > > - AP_AV_STATUS, AP_AUDIO_CHG);
> > > -
> > > - if (ret < 0)
> > > - DRM_DEV_ERROR(dev, "fail to config audio.\n");
> > > -
> > > - return ret;
> > > -}
> > > -
> > > /* Reduction of fraction a/b */
> > > static void anx7625_reduction_of_a_fraction(unsigned long *a, unsigned long *b)
> > > {
> > > @@ -431,7 +400,7 @@ static int anx7625_dsi_video_timing_config(struct anx7625_data *ctx)
> > > ret |= anx7625_write_and(ctx, ctx->i2c.rx_p1_client,
> > > MIPI_LANE_CTRL_0, 0xfc);
> > > ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client,
> > > - MIPI_LANE_CTRL_0, 3);
> > > + MIPI_LANE_CTRL_0, ctx->pdata.mipi_lanes - 1);
> > >
> > > /* Htotal */
> > > htotal = ctx->dt.hactive.min + ctx->dt.hfront_porch.min +
> > > @@ -615,6 +584,76 @@ static int anx7625_dsi_config(struct anx7625_data *ctx)
> > > return ret;
> > > }
> > >
> > > +static int anx7625_api_dpi_config(struct anx7625_data *ctx)
> > > +{
> > > + struct device *dev = &ctx->client->dev;
> > > + u16 freq = ctx->dt.pixelclock.min / 1000;
> > > + int ret;
> > > +
> > > + /* configure pixel clock */
> > > + ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
> > > + PIXEL_CLOCK_L, freq & 0xFF);
> > > + ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
> > > + PIXEL_CLOCK_H, (freq >> 8));
> > > +
> > > + /* set DPI mode */
> > > + /* set to DPI PLL module sel */
> > > + ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
> > > + MIPI_DIGITAL_PLL_9, 0x20);
> > > + /* power down MIPI */
> > > + ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
> > > + MIPI_LANE_CTRL_10, 0x08);
> > > + /* enable DPI mode */
> > > + ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p1_client,
> > > + MIPI_DIGITAL_PLL_18, 0x1C);
> > > + /* set first edge */
> > > + ret |= anx7625_reg_write(ctx, ctx->i2c.tx_p2_client,
> > > + VIDEO_CONTROL_0, 0x06);
> > > + if (ret < 0)
> > > + DRM_DEV_ERROR(dev, "IO error : dpi phy set failed.\n");
> > > +
> > > + return ret;
> > > +}
> > > +
> > > +static int anx7625_dpi_config(struct anx7625_data *ctx)
> > > +{
> > > + struct device *dev = &ctx->client->dev;
> > > + int ret;
> > > +
> > > + DRM_DEV_DEBUG_DRIVER(dev, "config dpi\n");
> > > +
> > > + /* DSC disable */
> > > + ret = anx7625_write_and(ctx, ctx->i2c.rx_p0_client,
> > > + R_DSC_CTRL_0, ~DSC_EN);
> > > + if (ret < 0) {
> > > + DRM_DEV_ERROR(dev, "IO error : disable dsc failed.\n");
> > > + return ret;
> > > + }
> > > +
> > > + ret = anx7625_config_bit_matrix(ctx);
> > > + if (ret < 0) {
> > > + DRM_DEV_ERROR(dev, "config bit matrix failed.\n");
> > > + return ret;
> > > + }
> > > +
> > > + ret = anx7625_api_dpi_config(ctx);
> > > + if (ret < 0) {
> > > + DRM_DEV_ERROR(dev, "mipi phy(dpi) setup failed.\n");
> > > + return ret;
> > > + }
> > > +
> > > + /* set MIPI RX EN */
> > > + ret = anx7625_write_or(ctx, ctx->i2c.rx_p0_client,
> > > + AP_AV_STATUS, AP_MIPI_RX_EN);
> > > + /* clear mute flag */
> > > + ret |= anx7625_write_and(ctx, ctx->i2c.rx_p0_client,
> > > + AP_AV_STATUS, (u8)~AP_MIPI_MUTE);
> > > + if (ret < 0)
> > > + DRM_DEV_ERROR(dev, "IO error : enable mipi rx failed.\n");
> > > +
> > > + return ret;
> > > +}
> > > +
> > > static void anx7625_dp_start(struct anx7625_data *ctx)
> > > {
> > > int ret;
> > > @@ -625,9 +664,10 @@ static void anx7625_dp_start(struct anx7625_data *ctx)
> > > return;
> > > }
> > >
> > > - anx7625_config_audio_input(ctx);
> > > -
> > > - ret = anx7625_dsi_config(ctx);
> > > + if (ctx->pdata.is_dpi)
> > > + ret = anx7625_dpi_config(ctx);
> > > + else
> > > + ret = anx7625_dsi_config(ctx);
> > >
> > > if (ret < 0)
> > > DRM_DEV_ERROR(dev, "MIPI phy setup error.\n");
> > > @@ -1075,6 +1115,7 @@ static void anx7625_start_dp_work(struct anx7625_data *ctx)
> > > return;
> > > }
> > >
> > > + ctx->hpd_status = 1;
> > > ctx->hpd_high_cnt++;
> > >
> > > /* Not support HDCP */
> > > @@ -1084,8 +1125,10 @@ static void anx7625_start_dp_work(struct anx7625_data *ctx)
> > > ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client, 0xec, 0x10);
> > > /* Interrupt for DRM */
> > > ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client, 0xff, 0x01);
> > > - if (ret < 0)
> > > + if (ret < 0) {
> > > + DRM_DEV_ERROR(dev, "fail to setting HDCP/auth\n");
> > > return;
> > > + }
> > >
> > > ret = anx7625_reg_read(ctx, ctx->i2c.rx_p1_client, 0x86);
> > > if (ret < 0)
> > > @@ -1104,6 +1147,10 @@ static void anx7625_hpd_polling(struct anx7625_data *ctx)
> > > int ret, val;
> > > struct device *dev = &ctx->client->dev;
> > >
> > > + /* Interrupt mode, no need poll HPD status, just return */
> > > + if (ctx->pdata.intp_irq)
> > > + return;
> > > +
> > > ret = readx_poll_timeout(anx7625_read_hpd_status_p0,
> > > ctx, val,
> > > ((val & HPD_STATUS) || (val < 0)),
> > > @@ -1131,6 +1178,21 @@ static void anx7625_remove_edid(struct anx7625_data *ctx)
> > > ctx->slimport_edid_p.edid_block_num = -1;
> > > }
> > >
> > > +static void anx7625_dp_adjust_swing(struct anx7625_data *ctx)
> > > +{
> > > + int i;
> > > +
> > > + for (i = 0; i < ctx->pdata.dp_lane0_swing_reg_cnt; i++)
> > > + anx7625_reg_write(ctx, ctx->i2c.tx_p1_client,
> > > + DP_TX_LANE0_SWING_REG0 + i,
> > > + ctx->pdata.lane0_reg_data[i] & 0xFF);
> > > +
> > > + for (i = 0; i < ctx->pdata.dp_lane1_swing_reg_cnt; i++)
> > > + anx7625_reg_write(ctx, ctx->i2c.tx_p1_client,
> > > + DP_TX_LANE1_SWING_REG0 + i,
> > > + ctx->pdata.lane1_reg_data[i] & 0xFF);
> > > +}
> > > +
> > > static void dp_hpd_change_handler(struct anx7625_data *ctx, bool on)
> > > {
> > > struct device *dev = &ctx->client->dev;
> > > @@ -1146,9 +1208,8 @@ static void dp_hpd_change_handler(struct anx7625_data *ctx, bool on)
> > > } else {
> > > DRM_DEV_DEBUG_DRIVER(dev, " HPD high\n");
> > > anx7625_start_dp_work(ctx);
> > > + anx7625_dp_adjust_swing(ctx);
> > > }
> > > -
> > > - ctx->hpd_status = 1;
> > > }
> > >
> > > static int anx7625_hpd_change_detect(struct anx7625_data *ctx)
> > > @@ -1225,20 +1286,72 @@ static irqreturn_t anx7625_intr_hpd_isr(int irq, void *data)
> > > return IRQ_HANDLED;
> > > }
> > >
> > > +static int anx7625_get_swing_setting(struct device *dev,
> > > + struct anx7625_platform_data *pdata)
> > > +{
> > > + int num_regs;
> > > +
> > > + if (of_get_property(dev->of_node,
> > > + "analogix,lane0-swing", &num_regs)) {
> > > + if (num_regs > DP_TX_SWING_REG_CNT)
> > > + num_regs = DP_TX_SWING_REG_CNT;
> > > +
> > > + pdata->dp_lane0_swing_reg_cnt = num_regs;
> > > + of_property_read_u32_array(dev->of_node, "analogix,lane0-swing",
> > > + pdata->lane0_reg_data, num_regs);
> > > + }
> > > +
> > > + if (of_get_property(dev->of_node,
> > > + "analogix,lane1-swing", &num_regs)) {
> > > + if (num_regs > DP_TX_SWING_REG_CNT)
> > > + num_regs = DP_TX_SWING_REG_CNT;
> > > +
> > > + pdata->dp_lane1_swing_reg_cnt = num_regs;
> > > + of_property_read_u32_array(dev->of_node, "analogix,lane1-swing",
> > > + pdata->lane1_reg_data, num_regs);
> > > + }
> > > +
> > > + return 0;
> > > +}
> > > +
> > > static int anx7625_parse_dt(struct device *dev,
> > > struct anx7625_platform_data *pdata)
> > > {
> > > - struct device_node *np = dev->of_node;
> > > + struct device_node *np = dev->of_node, *ep0;
> > > struct drm_panel *panel;
> > > int ret;
> > > + int bus_type, mipi_lanes;
> > > +
> > > + anx7625_get_swing_setting(dev, pdata);
> > >
> > > + pdata->is_dpi = 1; /* default dpi mode */
> > > pdata->mipi_host_node = of_graph_get_remote_node(np, 0, 0);
> > > if (!pdata->mipi_host_node) {
> > > DRM_DEV_ERROR(dev, "fail to get internal panel.\n");
> > > return -ENODEV;
> > > }
> > >
> > > - DRM_DEV_DEBUG_DRIVER(dev, "found dsi host node.\n");
> > > + bus_type = V4L2_FWNODE_BUS_TYPE_PARALLEL;
> > > + mipi_lanes = MAX_LANES_SUPPORT;
> > > + ep0 = of_graph_get_endpoint_by_regs(np, 0, 0);
> > > + if (ep0) {
> > > + if (of_property_read_u32(ep0, "bus-type", &bus_type))
> > > + bus_type = 0;
> > > +
> > > + mipi_lanes = of_property_count_u32_elems(ep0, "data-lanes");
> > > + }
> > > +
> > > + if (bus_type == V4L2_FWNODE_BUS_TYPE_PARALLEL) /* bus type is Parallel(DSI) */
> >
> > This is not correct *at all*. V4L2_FWNODE_BUS_TYPE_PARALLEL has nothing
> > to do with DSI. DSI stands for Digital *Serial* Interface. If anything,
> > the V4L2_FWNODE_BUS_TYPE_PARALLEL type would map better to DPI, even if
> > it's not an exact match.
> >
> > This patch has landed in v5.17-rc1, along with the corresponding
> > bindings. As DT bindings are an ABI, we should really fix this before
> > v5.17 is released. There is no DSI bus types defined in DT, and adding
> > one as a fix so late in the v5.17-rc cycle seems a bit of a stretch to
> > me (unless Rob disagrees).
> >
> > It would seem best to revert this series and the corresponding bindings,
> > and retry in v5.18.
>
> Hi, what about make a patch to change this line to:
> if (bus_type != V4L2_FWNODE_BUS_TYPE_PARALLEL), and then change the DTS
> file?

We could possibly use V4L2_FWNODE_BUS_TYPE_PARALLEL (5) for MIPI DPI
(although it's not a very accurate match, so a different type may be
better, this should be discussed), but V4L2_FWNODE_BUS_TYPE_CCP2 (1) is
definitely not appropriate for DSI. For that we need a new type, and I
don't think it should be rushed in v5.17.

> > > + pdata->is_dpi = 0;
> > > +
> > > + pdata->mipi_lanes = mipi_lanes;
> > > + if (pdata->mipi_lanes > MAX_LANES_SUPPORT || pdata->mipi_lanes <= 0)
> > > + pdata->mipi_lanes = MAX_LANES_SUPPORT;
> > > +
> > > + if (pdata->is_dpi)
> > > + DRM_DEV_DEBUG_DRIVER(dev, "found MIPI DPI host node.\n");
> > > + else
> > > + DRM_DEV_DEBUG_DRIVER(dev, "found MIPI DSI host node.\n");
> > >
> > > ret = drm_of_find_panel_or_bridge(np, 1, 0, &panel, NULL);
> > > if (ret < 0) {
> > > @@ -1301,9 +1414,13 @@ static enum drm_connector_status anx7625_sink_detect(struct anx7625_data *ctx)
> > > {
> > > struct device *dev = &ctx->client->dev;
> > >
> > > - DRM_DEV_DEBUG_DRIVER(dev, "sink detect, return connected\n");
> > > + DRM_DEV_DEBUG_DRIVER(dev, "sink detect\n");
> > >
> > > - return connector_status_connected;
> > > + if (ctx->pdata.panel_bridge)
> > > + return connector_status_connected;
> > > +
> > > + return ctx->hpd_status ? connector_status_connected :
> > > + connector_status_disconnected;
> > > }
> > >
> > > static int anx7625_attach_dsi(struct anx7625_data *ctx)
> > > @@ -1332,7 +1449,7 @@ static int anx7625_attach_dsi(struct anx7625_data *ctx)
> > > return -EINVAL;
> > > }
> > >
> > > - dsi->lanes = 4;
> > > + dsi->lanes = ctx->pdata.mipi_lanes;
> > > dsi->format = MIPI_DSI_FMT_RGB888;
> > > dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
> > > MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
> > > @@ -1460,6 +1577,10 @@ static bool anx7625_bridge_mode_fixup(struct drm_bridge *bridge,
> > >
> > > DRM_DEV_DEBUG_DRIVER(dev, "drm mode fixup set\n");
> > >
> > > + /* No need fixup for external monitor */
> > > + if (!ctx->pdata.panel_bridge)
> > > + return true;
> > > +
> > > hsync = mode->hsync_end - mode->hsync_start;
> > > hfp = mode->hsync_start - mode->hdisplay;
> > > hbp = mode->htotal - mode->hsync_end;
> > > @@ -1835,14 +1956,22 @@ static int anx7625_i2c_probe(struct i2c_client *client,
> > >
> > > platform->bridge.funcs = &anx7625_bridge_funcs;
> > > platform->bridge.of_node = client->dev.of_node;
> > > - platform->bridge.ops = DRM_BRIDGE_OP_EDID | DRM_BRIDGE_OP_HPD;
> > > - platform->bridge.type = DRM_MODE_CONNECTOR_eDP;
> > > + platform->bridge.ops = DRM_BRIDGE_OP_EDID;
> > > + if (!platform->pdata.panel_bridge)
> > > + platform->bridge.ops |= DRM_BRIDGE_OP_HPD |
> > > + DRM_BRIDGE_OP_DETECT;
> > > + platform->bridge.type = platform->pdata.panel_bridge ?
> > > + DRM_MODE_CONNECTOR_eDP :
> > > + DRM_MODE_CONNECTOR_DisplayPort;
> > > +
> > > drm_bridge_add(&platform->bridge);
> > >
> > > - ret = anx7625_attach_dsi(platform);
> > > - if (ret) {
> > > - DRM_DEV_ERROR(dev, "Fail to attach to dsi : %d\n", ret);
> > > - goto unregister_bridge;
> > > + if (!platform->pdata.is_dpi) {
> > > + ret = anx7625_attach_dsi(platform);
> > > + if (ret) {
> > > + DRM_DEV_ERROR(dev, "Fail to attach to dsi : %d\n", ret);
> > > + goto unregister_bridge;
> > > + }
> > > }
> > >
> > > DRM_DEV_DEBUG_DRIVER(dev, "probe done\n");
> > > diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.h b/drivers/gpu/drm/bridge/analogix/anx7625.h
> > > index 6dcf64c703f9..3ef1d8f4e575 100644
> > > --- a/drivers/gpu/drm/bridge/analogix/anx7625.h
> > > +++ b/drivers/gpu/drm/bridge/analogix/anx7625.h
> > > @@ -141,12 +141,20 @@
> > > #define HORIZONTAL_BACK_PORCH_H 0x22 /* Bit[7:4] are reserved */
> > >
> > > /******** END of I2C Address 0x72 *********/
> > > +
> > > +/***************************************************************/
> > > +/* Register definition of device address 0x7a */
> > > +#define DP_TX_SWING_REG_CNT 0x14
> > > +#define DP_TX_LANE0_SWING_REG0 0x00
> > > +#define DP_TX_LANE1_SWING_REG0 0x14
> > > +/******** END of I2C Address 0x7a *********/
> > > +
> > > /***************************************************************/
> > > /* Register definition of device address 0x7e */
> > >
> > > #define I2C_ADDR_7E_FLASH_CONTROLLER 0x7E
> > >
> > > -#define FLASH_LOAD_STA 0x05
> > > +#define FLASH_LOAD_STA 0x05
> > > #define FLASH_LOAD_STA_CHK BIT(7)
> > >
> > > #define XTAL_FRQ_SEL 0x3F
> > > @@ -349,12 +357,20 @@ struct s_edid_data {
> > >
> > > /***************** Display End *****************/
> > >
> > > +#define MAX_LANES_SUPPORT 4
> > > +
> > > struct anx7625_platform_data {
> > > struct gpio_desc *gpio_p_on;
> > > struct gpio_desc *gpio_reset;
> > > struct regulator_bulk_data supplies[3];
> > > struct drm_bridge *panel_bridge;
> > > int intp_irq;
> > > + int is_dpi;
> > > + int mipi_lanes;
> > > + int dp_lane0_swing_reg_cnt;
> > > + int lane0_reg_data[DP_TX_SWING_REG_CNT];
> > > + int dp_lane1_swing_reg_cnt;
> > > + int lane1_reg_data[DP_TX_SWING_REG_CNT];
> > > u32 low_power_mode;
> > > struct device_node *mipi_host_node;
> > > };

--
Regards,

Laurent Pinchart

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