[v4,PATCH 3/3] drm/mediatek: dpi: add bus format negotiation

From: Rex-BC Chen
Date: Tue May 25 2021 - 08:15:09 EST


Add the atomic_get_output_bus_fmts, atomic_get_input_bus_fmts to negotiate
the possible output and input formats for the current mode and monitor,
and use the negotiated formats in a basic atomic_check callback.

Signed-off-by: Jitao Shi <jitao.shi@xxxxxxxxxxxx>
Signed-off-by: Rex-BC Chen <rex-bc.chen@xxxxxxxxxxxx>
---
drivers/gpu/drm/mediatek/mtk_dpi.c | 78 ++++++++++++++++++++++++++++--
1 file changed, 73 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
index d6a422986efc..667a97470389 100644
--- a/drivers/gpu/drm/mediatek/mtk_dpi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
@@ -540,6 +540,73 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
return 0;
}

+static u32 *mtk_dpi_bridge_atomic_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 mtk_dpi *dpi = bridge_to_dpi(bridge);
+
+ *num_output_fmts = 0;
+
+ if (!dpi->conf->output_fmts)
+ return NULL;
+
+ *num_output_fmts = dpi->conf->num_output_fmts;
+
+ return (u32 *)dpi->conf->output_fmts;
+}
+
+#define MAX_INPUT_SEL_FORMATS 1
+
+static u32 *mtk_dpi_bridge_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;
+
+ *num_input_fmts = 1;
+ input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
+
+ return input_fmts;
+}
+
+static int mtk_dpi_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 mtk_dpi *dpi = bridge->driver_private;
+ unsigned int out_bus_format;
+
+ out_bus_format = bridge_state->output_bus_cfg.format;
+
+ dev_dbg(dpi->dev, "input format 0x%04x, output format 0x%04x\n",
+ bridge_state->input_bus_cfg.format,
+ bridge_state->output_bus_cfg.format);
+
+ dpi->ddr_edge_sel = (out_bus_format == MEDIA_BUS_FMT_RGB888_2X12_LE) ?
+ true : false;
+
+ dpi->bit_num = MTK_DPI_OUT_BIT_NUM_8BITS;
+ dpi->channel_swap = MTK_DPI_OUT_CHANNEL_SWAP_RGB;
+ dpi->yc_map = MTK_DPI_OUT_YC_MAP_RGB;
+ dpi->color_format = MTK_DPI_COLOR_FORMAT_RGB;
+
+ return 0;
+}
+
static int mtk_dpi_bridge_attach(struct drm_bridge *bridge,
enum drm_bridge_attach_flags flags)
{
@@ -592,6 +659,12 @@ static const struct drm_bridge_funcs mtk_dpi_bridge_funcs = {
.mode_valid = mtk_dpi_bridge_mode_valid,
.disable = mtk_dpi_bridge_disable,
.enable = mtk_dpi_bridge_enable,
+ .atomic_check = mtk_dpi_bridge_atomic_check,
+ .atomic_get_output_bus_fmts = mtk_dpi_bridge_atomic_get_output_bus_fmts,
+ .atomic_get_input_bus_fmts = mtk_dpi_bridge_atomic_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,
};

void mtk_dpi_start(struct device *dev)
@@ -638,11 +711,6 @@ static int mtk_dpi_bind(struct device *dev, struct device *master, void *data)
}
drm_connector_attach_encoder(dpi->connector, &dpi->encoder);

- dpi->bit_num = MTK_DPI_OUT_BIT_NUM_8BITS;
- dpi->channel_swap = MTK_DPI_OUT_CHANNEL_SWAP_RGB;
- dpi->yc_map = MTK_DPI_OUT_YC_MAP_RGB;
- dpi->color_format = MTK_DPI_COLOR_FORMAT_RGB;
-
return 0;

err_cleanup:
--
2.18.0