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Subject[RFC 04/11] drm/bridge: synopsys: dw-hdmi: add basic bridge_atomic_check
Date
Add all the supported input and output formats to the bridge
input_bus_caps and output_bus_caps, and add a very simple atomic check
implementation to negociate output and input bus formats.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
---
drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 53 +++++++++++++++++++++++
1 file changed, 53 insertions(+)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index b4901b174a90..121c2167ee20 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -91,6 +91,24 @@ static const u16 csc_coeff_rgb_in_eitu709[3][4] = {
{ 0x6756, 0x78ab, 0x2000, 0x0200 }
};

+static const u32 dw_hdmi_bus_fmts[] = {
+ MEDIA_BUS_FMT_RGB888_1X24,
+ MEDIA_BUS_FMT_RGB101010_1X30,
+ MEDIA_BUS_FMT_RGB121212_1X36,
+ MEDIA_BUS_FMT_RGB161616_1X48,
+ MEDIA_BUS_FMT_YUV8_1X24,
+ MEDIA_BUS_FMT_YUV10_1X30,
+ MEDIA_BUS_FMT_YUV12_1X36,
+ MEDIA_BUS_FMT_YUV16_1X48,
+ MEDIA_BUS_FMT_UYVY8_1X16,
+ MEDIA_BUS_FMT_UYVY10_1X20,
+ MEDIA_BUS_FMT_UYVY12_1X24,
+ MEDIA_BUS_FMT_UYYVYY8_0_5X24,
+ MEDIA_BUS_FMT_UYYVYY10_0_5X30,
+ MEDIA_BUS_FMT_UYYVYY12_0_5X36,
+ MEDIA_BUS_FMT_UYYVYY16_0_5X48,
+};
+
struct hdmi_vmode {
bool mdataenablepolarity;

@@ -2190,6 +2208,33 @@ static const struct drm_connector_helper_funcs dw_hdmi_connector_helper_funcs =
.get_modes = dw_hdmi_connector_get_modes,
};

+static int dw_hdmi_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 dw_hdmi *hdmi = bridge->driver_private;
+ int ret;
+
+ ret = drm_atomic_bridge_choose_output_bus_cfg(bridge_state, crtc_state,
+ conn_state);
+ if (ret)
+ return ret;
+
+ dev_dbg(hdmi->dev, "selected output format %x\n",
+ bridge_state->output_bus_cfg.fmt);
+
+ ret = drm_atomic_bridge_choose_input_bus_cfg(bridge_state, crtc_state,
+ conn_state);
+ if (ret)
+ return ret;
+
+ dev_dbg(hdmi->dev, "selected input format %x\n",
+ bridge_state->input_bus_cfg.fmt);
+
+ return 0;
+}
+
static int dw_hdmi_bridge_attach(struct drm_bridge *bridge)
{
struct dw_hdmi *hdmi = bridge->driver_private;
@@ -2267,6 +2312,7 @@ static void dw_hdmi_bridge_enable(struct drm_bridge *bridge)

static const struct drm_bridge_funcs dw_hdmi_bridge_funcs = {
.attach = dw_hdmi_bridge_attach,
+ .atomic_check = dw_hdmi_bridge_atomic_check,
.enable = dw_hdmi_bridge_enable,
.disable = dw_hdmi_bridge_disable,
.mode_set = dw_hdmi_bridge_mode_set,
@@ -2733,6 +2779,13 @@ __dw_hdmi_probe(struct platform_device *pdev,

hdmi->bridge.driver_private = hdmi;
hdmi->bridge.funcs = &dw_hdmi_bridge_funcs;
+ hdmi->bridge.input_bus_caps.supported_fmts = dw_hdmi_bus_fmts;
+ hdmi->bridge.input_bus_caps.num_supported_fmts =
+ ARRAY_SIZE(dw_hdmi_bus_fmts);
+ hdmi->bridge.output_bus_caps.supported_fmts = dw_hdmi_bus_fmts;
+ hdmi->bridge.output_bus_caps.num_supported_fmts =
+ ARRAY_SIZE(dw_hdmi_bus_fmts);
+
#ifdef CONFIG_OF
hdmi->bridge.of_node = pdev->dev.of_node;
#endif
--
2.22.0
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