linux-kernel - [PATCH 3/3] drm/mediatek: dpi: add bus format negociation

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Date:   Tue, 30 Mar 2021 23:53:30 +0800
From:   Jitao Shi <jitao.shi@...iatek.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
CC:     <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>, <yingjoe.chen@...iatek.com>,
        <eddie.huang@...iatek.com>, <cawa.cheng@...iatek.com>,
        <bibby.hsieh@...iatek.com>, <ck.hu@...iatek.com>,
        <stonea168@....com>, <huijuan.xie@...iatek.com>,
        <rex-bc.chen@...iatek.com>, Jitao Shi <jitao.shi@...iatek.com>
Subject: [PATCH 3/3] drm/mediatek: dpi: add bus format negociation

Add the atomic_get_output_bus_fmts, atomic_get_input_bus_fmts to negociate
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@...iatek.com>
---
 drivers/gpu/drm/mediatek/mtk_dpi.c | 96 ++++++++++++++++++++++++++++++++++++--
 1 file changed, 91 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
index 87bb27649c4c..4e45d1b01b0c 100644
--- a/drivers/gpu/drm/mediatek/mtk_dpi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
@@ -81,6 +81,8 @@ struct mtk_dpi {
 	struct pinctrl *pinctrl;
 	struct pinctrl_state *pins_gpio;
 	struct pinctrl_state *pins_dpi;
+	unsigned int in_bus_format;
+	unsigned int out_bus_format;
 	bool ddr_edge_sel;
 	int refcount;
 };
@@ -534,6 +536,92 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
 	return 0;
 }
 
+#define MAX_OUTPUT_SEL_FORMATS	2
+
+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 drm_display_mode *mode = &crtc_state->mode;
+	u32 *output_fmts;
+	struct mtk_dpi *dpi = bridge_to_dpi(bridge);
+
+	*num_output_fmts = 0;
+
+	output_fmts = kcalloc(MAX_OUTPUT_SEL_FORMATS, sizeof(*output_fmts),
+			      GFP_KERNEL);
+	if (!output_fmts)
+		return NULL;
+
+	/* Default 8bit RGB fallback */
+	if (dpi->conf->dual_edge) {
+		output_fmts[0] =  MEDIA_BUS_FMT_RGB888_2X12_LE;
+		output_fmts[1] =  MEDIA_BUS_FMT_RGB888_2X12_BE;
+		*num_output_fmts = 2;
+	} else {
+		output_fmts[0] =  MEDIA_BUS_FMT_RGB888_1X24;
+		*num_output_fmts = 1;
+	}
+
+	return 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;
+
+	dpi->out_bus_format = bridge_state->output_bus_cfg.format;
+
+	dpi->in_bus_format = bridge_state->input_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);
+
+	if (dpi->out_bus_format == MEDIA_BUS_FMT_RGB888_2X12_LE ||
+	    dpi->out_bus_format == MEDIA_BUS_FMT_RGB888_2X12_BE) {
+		dpi->ddr_edge_sel =
+			(dpi->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)
 {
@@ -572,6 +660,9 @@ static const struct drm_bridge_funcs mtk_dpi_bridge_funcs = {
 	.mode_set = mtk_dpi_bridge_mode_set,
 	.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,
 };
 
 static void mtk_dpi_start(struct mtk_ddp_comp *comp)
@@ -621,11 +712,6 @@ static int mtk_dpi_bind(struct device *dev, struct device *master, void *data)
 		goto err_cleanup;
 	}
 
-	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:
-- 
2.12.5