Re: [PATCH 1/7] drm/bridge: display-connector: implement bus fmts callbacks
From: Sam Ravnborg <hidden>
Date: 2021-10-14 17:46:55
Also in:
dri-devel, linux-amlogic
Hi Neil, code looks fine. A few improvement proposals to the comments. With the include order fixed and the comments considered: Reviewed-by: Sam Ravnborg <redacted> Sam On Thu, Oct 14, 2021 at 05:26:00PM +0200, Neil Armstrong wrote:
quoted hunk ↗ jump to hunk
Since this bridge is tied to the connector, it acts like a passthrough, so concerning the output & input bus formats, either pass the bus formats from the previous bridge or return fallback data like done in the bridge function: drm_atomic_bridge_chain_select_bus_fmts() & select_bus_fmt_recursive. This permits avoiding skipping the negociation if the remaining bridge chain has all the bits in place. Without this bus fmt negociation breaks on drm/meson HDMI pipeline when attaching dw-hdmi with DRM_BRIDGE_ATTACH_NO_CONNECTOR, because the last bridge of the display-connector doesn't implement buf fmt callbacks and MEDIA_BUS_FMT_FIXED is used leading to select an unsupported default bus format from dw-hdmi. Signed-off-by: Neil Armstrong <redacted> --- drivers/gpu/drm/bridge/display-connector.c | 88 ++++++++++++++++++++++ 1 file changed, 88 insertions(+)diff --git a/drivers/gpu/drm/bridge/display-connector.c b/drivers/gpu/drm/bridge/display-connector.c index 05eb759da6fc..9697ac173157 100644 --- a/drivers/gpu/drm/bridge/display-connector.c +++ b/drivers/gpu/drm/bridge/display-connector.c@@ -14,6 +14,7 @@ #include <linux/regulator/consumer.h> #include <drm/drm_bridge.h> +#include <drm/drm_atomic_helper.h> #include <drm/drm_edid.h>
Alphabetic order.
quoted hunk ↗ jump to hunk
struct display_connector {@@ -87,10 +88,97 @@ static struct edid *display_connector_get_edid(struct drm_bridge *bridge, return drm_get_edid(connector, conn->bridge.ddc); } +/* + * Since this bridge is tied to the connector, it acts like a passthrough, + * so concerning the output bus formats, either pass the bus formats from the + * previous bridge or return fallback data like done in the bridge function: + * drm_atomic_bridge_chain_select_bus_fmts(). + * This permits avoiding skipping the negociation if the bridge chain has all + * bits in place.
negociation if => negotiation of Consider the following wording: This supports negotiation if the bridge chain has all bits in place.
+ */
+static u32 *display_connector_get_output_bus_fmts(struct drm_bridge *bridge,
+ struct drm_bridge_state *bridge_state,
+ struct drm_crtc_state *crtc_state,
+ struct drm_connector_state *conn_state,
+ unsigned int *num_output_fmts)
+{
+ struct drm_bridge *prev_bridge = drm_bridge_get_prev_bridge(bridge);
+ struct drm_bridge_state *prev_bridge_state;
+
+ if (!prev_bridge || !prev_bridge->funcs->atomic_get_output_bus_fmts) {
+ struct drm_connector *conn = conn_state->connector;
+ u32 *out_bus_fmts;
+
+ *num_output_fmts = 1;
+ out_bus_fmts = kmalloc(sizeof(*out_bus_fmts), GFP_KERNEL);
+ if (!out_bus_fmts)
+ return NULL;
+
+ if (conn->display_info.num_bus_formats &&
+ conn->display_info.bus_formats)
+ out_bus_fmts[0] = conn->display_info.bus_formats[0];
+ else
+ out_bus_fmts[0] = MEDIA_BUS_FMT_FIXED;
+
+ return out_bus_fmts;
+ }
+
+ prev_bridge_state = drm_atomic_get_new_bridge_state(crtc_state->state,
+ prev_bridge);
+
+ return prev_bridge->funcs->atomic_get_output_bus_fmts(prev_bridge, prev_bridge_state,
+ crtc_state, conn_state,
+ num_output_fmts);
+}
+
+/*
+ * Since this bridge is tied to the connector, it acts like a passthrough,
+ * so concerning the input bus formats, either pass the bus formats from the
+ * previous bridge or return fallback data like done in the bridge function:
+ * select_bus_fmt_recursive() when atomic_get_input_bus_fmts is not supported.Maybe use this this: from the previous bridge or MEDIA_BUS_FMT_FIXED (like select_bus_fmt_recursive())
+ * This permits avoiding skipping the negociation if the bridge chain has all + * bits in place.
Like above
+ */
+static u32 *display_connector_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)
+{
+ struct drm_bridge *prev_bridge = drm_bridge_get_prev_bridge(bridge);
+ struct drm_bridge_state *prev_bridge_state;
+
+ if (!prev_bridge || !prev_bridge->funcs->atomic_get_input_bus_fmts) {
+ u32 *in_bus_fmts;
+
+ *num_input_fmts = 1;
+ in_bus_fmts = kmalloc(sizeof(*in_bus_fmts), GFP_KERNEL);
+ if (!in_bus_fmts)
+ return NULL;
+
+ in_bus_fmts[0] = MEDIA_BUS_FMT_FIXED;
+
+ return in_bus_fmts;
+ }
+
+ prev_bridge_state = drm_atomic_get_new_bridge_state(crtc_state->state,
+ prev_bridge);
+
+ return prev_bridge->funcs->atomic_get_input_bus_fmts(prev_bridge, prev_bridge_state,
+ crtc_state, conn_state, output_fmt,
+ num_input_fmts);
+}
+
static const struct drm_bridge_funcs display_connector_bridge_funcs = {
.attach = display_connector_attach,
.detect = display_connector_detect,
.get_edid = display_connector_get_edid,
+ .atomic_get_output_bus_fmts = display_connector_get_output_bus_fmts,
+ .atomic_get_input_bus_fmts = display_connector_get_input_bus_fmts,
+ .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,
};
static irqreturn_t display_connector_hpd_irq(int irq, void *arg)
--
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