Re: [PATCH] drm/bridge: tc358767: Support input format negotiation hook

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Hi Jan,

On 31/10/2023 08:24, Jan Kiszka wrote:
On 30.10.23 20:28, Aradhya Bhatia wrote:
With new connector model, tc358767 will not create the connector, when
DRM_BRIDGE_ATTACH_NO_CONNECTOR is set and display-controller driver will
rely on format negotiation to setup the encoder format.

Add the missing input-format negotiation hook in the
drm_bridge_funcs to complete DRM_BRIDGE_ATTACH_NO_CONNECTOR support.

Input format is selected to MEDIA_BUS_FMT_RGB888_1X24 as default, as is
the case with older model.

Reported-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
Signed-off-by: Aradhya Bhatia <a-bhatia1@xxxxxx>
---

Notes:

   * Since I do not have hardware with me, this was just build tested. I would
     appreciate it if someone could test and review it, especically somebody, who
     uses the bridge for DPI/DSI to eDP format conversion.

   * The Toshiba TC358767 bridge is not enabled in arm64 defconfig by default,
     when it should be. Hence, I sent a quick patch[0] earlier.

[0]: https://lore.kernel.org/all/20231030152834.18450-1-a-bhatia1@xxxxxx/

  drivers/gpu/drm/bridge/tc358767.c | 25 +++++++++++++++++++++++++
  1 file changed, 25 insertions(+)

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index ef2e373606ba..0affcefdeb1c 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -1751,6 +1751,30 @@ tc_dpi_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
  	return input_fmts;
  }
+static u32 *
+tc_edp_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
+				 struct drm_bridge_state *bridge_state,
+				 struct drm_crtc_state *crtc_state,
+				 struct drm_connector_state *conn_state,
+				 u32 output_fmt,
+				 unsigned int *num_input_fmts)
+{
+	u32 *input_fmts;
+
+	*num_input_fmts = 0;
+
+	input_fmts = kcalloc(MAX_INPUT_SEL_FORMATS, sizeof(*input_fmts),
+			     GFP_KERNEL);
+	if (!input_fmts)
+		return NULL;
+
+	/* This is the DSI/DPI-end bus format */
+	input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
+	*num_input_fmts = 1;
+
+	return input_fmts;
+}
+
  static const struct drm_bridge_funcs tc_dpi_bridge_funcs = {
  	.attach = tc_dpi_bridge_attach,
  	.mode_valid = tc_dpi_mode_valid,
@@ -1777,6 +1801,7 @@ static const struct drm_bridge_funcs tc_edp_bridge_funcs = {
  	.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,
+	.atomic_get_input_bus_fmts = tc_edp_atomic_get_input_bus_fmts,
  };
static bool tc_readable_reg(struct device *dev, unsigned int reg)

base-commit: c503e3eec382ac708ee7adf874add37b77c5d312

Doesn't help, callback is never invoked. There must be more missing.

Regarding test setup: Maybe your colleague Preneeth can help to give you
access, he just received some devices from us. Otherwise, drop me
instrumentation patches.

Can you try with this change:

diff --git a/drivers/gpu/drm/bridge/tc358767.c b/drivers/gpu/drm/bridge/tc358767.c
index 0affcefdeb1c..137a9f5e3cad 100644
--- a/drivers/gpu/drm/bridge/tc358767.c
+++ b/drivers/gpu/drm/bridge/tc358767.c
@@ -1579,6 +1579,13 @@ static struct edid *tc_get_edid(struct drm_bridge *bridge,
                                struct drm_connector *connector)
 {
        struct tc_data *tc = bridge_to_tc(bridge);
+       int ret;
+
+       ret = tc_get_display_props(tc);
+       if (ret < 0) {
+               dev_err(tc->dev, "failed to read display props: %d\n", ret);
+               return 0;
+       }
return drm_get_edid(connector, &tc->aux.ddc);
 }

 Tomi




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