[PATCH v3 6/6] drm/ingenic: Attach bridge chain to encoders
Paul Cercueil
paul at crapouillou.net
Thu Sep 23 08:49:03 UTC 2021
Hi Nikolaus,
Le jeu., sept. 23 2021 at 07:52:08 +0200, H. Nikolaus Schaller
<hns at goldelico.com> a écrit :
> Hi Paul,
> thanks for another update.
>
> We have been delayed to rework the CI20 HDMI code on top of your
> series
> but it basically works in some situations. There is for example a
> problem
> if the EDID reports DRM_COLOR_FORMAT_YCRCB422 but it appears to be
> outside
> of your series.
I think the SoC can output YCbCr as well, but I never tried to use it.
> The only issue we have is described below.
>
>> Am 22.09.2021 um 22:55 schrieb Paul Cercueil <paul at crapouillou.net>:
>>
>> Attach a top-level bridge to each encoder, which will be used for
>> negociating the bus format and flags.
>>
>> All the bridges are now attached with
>> DRM_BRIDGE_ATTACH_NO_CONNECTOR.
>>
>> Signed-off-by: Paul Cercueil <paul at crapouillou.net>
>> ---
>> drivers/gpu/drm/ingenic/ingenic-drm-drv.c | 92
>> +++++++++++++++++------
>> 1 file changed, 70 insertions(+), 22 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
>> b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
>> index a5e2880e07a1..a05a9fa6e115 100644
>> --- a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
>> +++ b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
>> @@ -21,6 +21,7 @@
>> #include <drm/drm_atomic.h>
>> #include <drm/drm_atomic_helper.h>
>> #include <drm/drm_bridge.h>
>> +#include <drm/drm_bridge_connector.h>
>> #include <drm/drm_color_mgmt.h>
>> #include <drm/drm_crtc.h>
>> #include <drm/drm_crtc_helper.h>
>> @@ -108,6 +109,19 @@ struct ingenic_drm {
>> struct drm_private_obj private_obj;
>> };
>>
>> +struct ingenic_drm_bridge {
>> + struct drm_encoder encoder;
>> + struct drm_bridge bridge, *next_bridge;
>> +
>> + struct drm_bus_cfg bus_cfg;
>> +};
>> +
>> +static inline struct ingenic_drm_bridge *
>> +to_ingenic_drm_bridge(struct drm_encoder *encoder)
>> +{
>> + return container_of(encoder, struct ingenic_drm_bridge, encoder);
>> +}
>> +
>> static inline struct ingenic_drm_private_state *
>> to_ingenic_drm_priv_state(struct drm_private_state *state)
>> {
>> @@ -668,11 +682,10 @@ static void
>> ingenic_drm_encoder_atomic_mode_set(struct drm_encoder *encoder,
>> {
>> struct ingenic_drm *priv = drm_device_get_priv(encoder->dev);
>> struct drm_display_mode *mode = &crtc_state->adjusted_mode;
>> - struct drm_connector *conn = conn_state->connector;
>> - struct drm_display_info *info = &conn->display_info;
>> + struct ingenic_drm_bridge *bridge =
>> to_ingenic_drm_bridge(encoder);
>> unsigned int cfg, rgbcfg = 0;
>>
>> - priv->panel_is_sharp = info->bus_flags &
>> DRM_BUS_FLAG_SHARP_SIGNALS;
>> + priv->panel_is_sharp = bridge->bus_cfg.flags &
>> DRM_BUS_FLAG_SHARP_SIGNALS;
>>
>> if (priv->panel_is_sharp) {
>> cfg = JZ_LCD_CFG_MODE_SPECIAL_TFT_1 | JZ_LCD_CFG_REV_POLARITY;
>> @@ -685,19 +698,19 @@ static void
>> ingenic_drm_encoder_atomic_mode_set(struct drm_encoder *encoder,
>> cfg |= JZ_LCD_CFG_HSYNC_ACTIVE_LOW;
>> if (mode->flags & DRM_MODE_FLAG_NVSYNC)
>> cfg |= JZ_LCD_CFG_VSYNC_ACTIVE_LOW;
>> - if (info->bus_flags & DRM_BUS_FLAG_DE_LOW)
>> + if (bridge->bus_cfg.flags & DRM_BUS_FLAG_DE_LOW)
>> cfg |= JZ_LCD_CFG_DE_ACTIVE_LOW;
>> - if (info->bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)
>> + if (bridge->bus_cfg.flags & DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)
>> cfg |= JZ_LCD_CFG_PCLK_FALLING_EDGE;
>>
>> if (!priv->panel_is_sharp) {
>> - if (conn->connector_type == DRM_MODE_CONNECTOR_TV) {
>> + if (conn_state->connector->connector_type ==
>> DRM_MODE_CONNECTOR_TV) {
>> if (mode->flags & DRM_MODE_FLAG_INTERLACE)
>> cfg |= JZ_LCD_CFG_MODE_TV_OUT_I;
>> else
>> cfg |= JZ_LCD_CFG_MODE_TV_OUT_P;
>> } else {
>> - switch (*info->bus_formats) {
>> + switch (bridge->bus_cfg.format) {
>> case MEDIA_BUS_FMT_RGB565_1X16:
>> cfg |= JZ_LCD_CFG_MODE_GENERIC_16BIT;
>> break;
>> @@ -723,20 +736,29 @@ static void
>> ingenic_drm_encoder_atomic_mode_set(struct drm_encoder *encoder,
>> regmap_write(priv->map, JZ_REG_LCD_RGBC, rgbcfg);
>> }
>>
>> -static int ingenic_drm_encoder_atomic_check(struct drm_encoder
>> *encoder,
>> - struct drm_crtc_state *crtc_state,
>> - struct drm_connector_state *conn_state)
>> +static int ingenic_drm_bridge_attach(struct drm_bridge *bridge,
>> + enum drm_bridge_attach_flags flags)
>> +{
>> + struct ingenic_drm_bridge *ib =
>> to_ingenic_drm_bridge(bridge->encoder);
>> +
>> + return drm_bridge_attach(bridge->encoder, ib->next_bridge,
>> + &ib->bridge, flags);
>> +}
>> +
>> +static int ingenic_drm_bridge_atomic_check(struct drm_bridge
>> *bridge,
>> + struct drm_bridge_state *bridge_state,
>> + struct drm_crtc_state *crtc_state,
>> + struct drm_connector_state *conn_state)
>> {
>> - struct drm_display_info *info =
>> &conn_state->connector->display_info;
>> struct drm_display_mode *mode = &crtc_state->adjusted_mode;
>> + struct ingenic_drm_bridge *ib =
>> to_ingenic_drm_bridge(bridge->encoder);
>>
>> - if (info->num_bus_formats != 1)
>> - return -EINVAL;
>> + ib->bus_cfg = bridge_state->output_bus_cfg;
>>
>> if (conn_state->connector->connector_type == DRM_MODE_CONNECTOR_TV)
>> return 0;
>>
>> - switch (*info->bus_formats) {
>> + switch (bridge_state->output_bus_cfg.format) {
>> case MEDIA_BUS_FMT_RGB888_3X8:
>> case MEDIA_BUS_FMT_RGB888_3X8_DELTA:
>> /*
>> @@ -900,8 +922,16 @@ static const struct drm_crtc_helper_funcs
>> ingenic_drm_crtc_helper_funcs = {
>> };
>>
>> static const struct drm_encoder_helper_funcs
>> ingenic_drm_encoder_helper_funcs = {
>> - .atomic_mode_set = ingenic_drm_encoder_atomic_mode_set,
>> - .atomic_check = ingenic_drm_encoder_atomic_check,
>> + .atomic_mode_set = ingenic_drm_encoder_atomic_mode_set,
>> +};
>> +
>> +static const struct drm_bridge_funcs ingenic_drm_bridge_funcs = {
>> + .attach = ingenic_drm_bridge_attach,
>> + .atomic_check = ingenic_drm_bridge_atomic_check,
>> + .atomic_reset = drm_atomic_helper_bridge_reset,
>> + .atomic_duplicate_state =
>> drm_atomic_helper_bridge_duplicate_state,
>> + .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
>> + .atomic_get_input_bus_fmts =
>> drm_atomic_helper_bridge_propagate_bus_fmt,
>> };
>>
>> static const struct drm_mode_config_funcs
>> ingenic_drm_mode_config_funcs = {
>> @@ -976,7 +1006,9 @@ static int ingenic_drm_bind(struct device
>> *dev, bool has_components)
>> struct drm_plane *primary;
>> struct drm_bridge *bridge;
>> struct drm_panel *panel;
>> + struct drm_connector *connector;
>> struct drm_encoder *encoder;
>> + struct ingenic_drm_bridge *ib;
>> struct drm_device *drm;
>> void __iomem *base;
>> long parent_rate;
>> @@ -1154,20 +1186,36 @@ static int ingenic_drm_bind(struct device
>> *dev, bool has_components)
>> bridge = devm_drm_panel_bridge_add_typed(dev, panel,
>> DRM_MODE_CONNECTOR_DPI);
>>
>> - encoder = drmm_plain_encoder_alloc(drm, NULL,
>> DRM_MODE_ENCODER_DPI, NULL);
>> - if (IS_ERR(encoder)) {
>> - ret = PTR_ERR(encoder);
>> + ib = drmm_encoder_alloc(drm, struct ingenic_drm_bridge, encoder,
>> + NULL, DRM_MODE_ENCODER_DPI, NULL);
>> + if (IS_ERR(ib)) {
>> + ret = PTR_ERR(ib);
>> dev_err(dev, "Failed to init encoder: %d\n", ret);
>> return ret;
>> }
>>
>> - encoder->possible_crtcs = 1;
>> + encoder = &ib->encoder;
>> + encoder->possible_crtcs = drm_crtc_mask(&priv->crtc);
>>
>> drm_encoder_helper_add(encoder,
>> &ingenic_drm_encoder_helper_funcs);
>>
>> - ret = drm_bridge_attach(encoder, bridge, NULL, 0);
>> - if (ret)
>> + ib->bridge.funcs = &ingenic_drm_bridge_funcs;
>> + ib->next_bridge = bridge;
>> +
>> + ret = drm_bridge_attach(encoder, &ib->bridge, NULL,
>> + DRM_BRIDGE_ATTACH_NO_CONNECTOR);
>
> DRM_BRIDGE_ATTACH_NO_CONNECTOR makes it fundamentally incompatible
> with synopsys/dw_hdmi.c
>
> That driver checks for DRM_BRIDGE_ATTACH_NO_CONNECTOR being NOT
> present,
> since it wants to register its own connector through
> dw_hdmi_connector_create().
>
> It does it for a reason: the dw-hdmi is a multi-function driver which
> does
> HDMI and DDC/EDID stuff in a single driver (because I/O registers and
> power
> management seem to be shared).
The IT66121 driver does all of that too, and does not need
DRM_BRIDGE_ATTACH_NO_CONNECTOR. The drm_bridge_funcs struct has
callbacks to handle cable detection and DDC stuff.
> Since I do not see who could split this into a separate bridge and a
> connector driver
> and test it on multiple SoC platforms (there are at least 3 or 4), I
> think modifying
> the fundamentals of the dw-hdmi architecture just to get CI20 HDMI
> working is not
> our turf.
You could have a field in the dw-hdmi pdata structure, that would
instruct the driver whether or not it should use the new API. Ugly, I
know, and would probably duplicate a lot of code, but that would allow
other drivers to be updated at a later date.
> Therefore the code here should be able to detect if
> drm_bridge_attach() already
> creates and attaches a connector and then skip the code below.
Not that easy, unfortunately. On one side we have dw-hdmi which checks
that DRM_BRIDGE_ATTACH_NO_CONNECTOR is not set, and on the other side
we have other drivers like the IT66121 which will fail if this flag is
not set.
Cheers,
-Paul
>> + if (ret) {
>> + dev_err(dev, "Unable to attach bridge\n");
>> return ret;
>> + }
>> +
>> + connector = drm_bridge_connector_init(drm, encoder);
>> + if (IS_ERR(connector)) {
>> + dev_err(dev, "Unable to init connector\n");
>> + return PTR_ERR(connector);
>> + }
>> +
>> + drm_connector_attach_encoder(connector, encoder);
>> }
>>
>> drm_for_each_encoder(encoder, drm) {
>> --
>> 2.33.0
>
> I haven't replaced v2 with v3 in our test tree yet, but will do asap.
>
> BR and thanks,
> Nikolaus
>
>
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