[PATCH v3 10/10] drm/imx: imx-ldb: allow to determine bus format from the connected panel
Philipp Zabel
p.zabel at pengutronix.de
Thu Mar 12 02:58:16 PDT 2015
This patch makes the fsl,data-width and fsl,data-mapping device tree
properties optional if a panel is connected to the ldb output port
via the of_graph bindings. The data mapping is determined from the
display_info.bus_format field provided by the panel.
Signed-off-by: Philipp Zabel <p.zabel at pengutronix.de>
---
drivers/gpu/drm/imx/imx-ldb.c | 116 +++++++++++++++++++++++-------------------
1 file changed, 63 insertions(+), 53 deletions(-)
diff --git a/drivers/gpu/drm/imx/imx-ldb.c b/drivers/gpu/drm/imx/imx-ldb.c
index 544282b..abacc8f 100644
--- a/drivers/gpu/drm/imx/imx-ldb.c
+++ b/drivers/gpu/drm/imx/imx-ldb.c
@@ -63,6 +63,7 @@ struct imx_ldb_channel {
int edid_len;
struct drm_display_mode mode;
int mode_valid;
+ int bus_format;
};
struct bus_mux {
@@ -96,7 +97,11 @@ static int imx_ldb_connector_get_modes(struct drm_connector *connector)
if (imx_ldb_ch->panel && imx_ldb_ch->panel->funcs &&
imx_ldb_ch->panel->funcs->get_modes) {
+ struct drm_display_info *di = &connector->display_info;
+
num_modes = imx_ldb_ch->panel->funcs->get_modes(imx_ldb_ch->panel);
+ if (!imx_ldb_ch->bus_format && di->num_bus_formats)
+ imx_ldb_ch->bus_format = di->bus_formats[0];
if (num_modes > 0)
return num_modes;
}
@@ -173,21 +178,33 @@ static void imx_ldb_encoder_prepare(struct drm_encoder *encoder)
{
struct imx_ldb_channel *imx_ldb_ch = enc_to_imx_ldb_ch(encoder);
struct imx_ldb *ldb = imx_ldb_ch->ldb;
+ int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
u32 bus_format;
- switch (imx_ldb_ch->chno) {
- case 0:
- bus_format = (ldb->ldb_ctrl & LDB_DATA_WIDTH_CH0_24) ?
- MEDIA_BUS_FMT_RGB888_1X24 : MEDIA_BUS_FMT_RGB666_1X18;
+ switch (imx_ldb_ch->bus_format) {
+ default:
+ dev_warn(ldb->dev,
+ "could not determine data mapping, default to 18-bit \"spwg\"\n");
+ /* fallthrough */
+ case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
+ bus_format = MEDIA_BUS_FMT_RGB666_1X18;
break;
- case 1:
- bus_format = (ldb->ldb_ctrl & LDB_DATA_WIDTH_CH1_24) ?
- MEDIA_BUS_FMT_RGB888_1X24 : MEDIA_BUS_FMT_RGB666_1X18;
+ case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
+ bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+ if (imx_ldb_ch->chno == 0 || dual)
+ ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24;
+ if (imx_ldb_ch->chno == 1 || dual)
+ ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24;
break;
- default:
- dev_err(ldb->dev, "unable to config di%d panel format\n",
- imx_ldb_ch->chno);
+ case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+ if (imx_ldb_ch->chno == 0 || dual)
+ ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24 |
+ LDB_BIT_MAP_CH0_JEIDA;
+ if (imx_ldb_ch->chno == 1 || dual)
+ ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24 |
+ LDB_BIT_MAP_CH1_JEIDA;
+ break;
}
imx_drm_set_bus_format(encoder, bus_format);
@@ -426,25 +443,39 @@ enum {
LVDS_BIT_MAP_JEIDA
};
-static const char * const imx_ldb_bit_mappings[] = {
- [LVDS_BIT_MAP_SPWG] = "spwg",
- [LVDS_BIT_MAP_JEIDA] = "jeida",
+struct imx_ldb_bit_mapping {
+ u32 bus_format;
+ u32 datawidth;
+ const char * const mapping;
};
-static const int of_get_data_mapping(struct device_node *np)
+static const struct imx_ldb_bit_mapping imx_ldb_bit_mappings[] = {
+ { MEDIA_BUS_FMT_RGB666_1X7X3_SPWG, 18, "spwg" },
+ { MEDIA_BUS_FMT_RGB888_1X7X4_SPWG, 24, "spwg" },
+ { MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA, 24, "jeida" },
+};
+
+static u32 of_get_bus_format(struct device *dev, struct device_node *np)
{
const char *bm;
+ u32 datawidth = 0;
int ret, i;
ret = of_property_read_string(np, "fsl,data-mapping", &bm);
if (ret < 0)
return ret;
- for (i = 0; i < ARRAY_SIZE(imx_ldb_bit_mappings); i++)
- if (!strcasecmp(bm, imx_ldb_bit_mappings[i]))
- return i;
+ of_property_read_u32(np, "fsl,data-width", &datawidth);
+
+ for (i = 0; i < ARRAY_SIZE(imx_ldb_bit_mappings); i++) {
+ if (!strcasecmp(bm, imx_ldb_bit_mappings[i].mapping) &&
+ datawidth == imx_ldb_bit_mappings[i].datawidth)
+ return imx_ldb_bit_mappings[i].bus_format;
+ }
+
+ dev_err(dev, "invalid data mapping: %d-bit \"%s\"\n", datawidth, bm);
- return -EINVAL;
+ return -ENOENT;
}
static struct bus_mux imx6q_lvds_mux[2] = {
@@ -481,8 +512,6 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
struct device_node *child;
const u8 *edidp;
struct imx_ldb *imx_ldb;
- int datawidth;
- int mapping;
int dual;
int ret;
int i;
@@ -583,39 +612,20 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
channel->mode_valid = 1;
}
- ret = of_property_read_u32(child, "fsl,data-width", &datawidth);
- if (ret)
- datawidth = 0;
- else if (datawidth != 18 && datawidth != 24)
- return -EINVAL;
-
- mapping = of_get_data_mapping(child);
- switch (mapping) {
- case LVDS_BIT_MAP_SPWG:
- if (datawidth == 24) {
- if (i == 0 || dual)
- imx_ldb->ldb_ctrl |=
- LDB_DATA_WIDTH_CH0_24;
- if (i == 1 || dual)
- imx_ldb->ldb_ctrl |=
- LDB_DATA_WIDTH_CH1_24;
- }
- break;
- case LVDS_BIT_MAP_JEIDA:
- if (datawidth == 18) {
- dev_err(dev, "JEIDA standard only supported in 24 bit\n");
- return -EINVAL;
- }
- if (i == 0 || dual)
- imx_ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH0_24 |
- LDB_BIT_MAP_CH0_JEIDA;
- if (i == 1 || dual)
- imx_ldb->ldb_ctrl |= LDB_DATA_WIDTH_CH1_24 |
- LDB_BIT_MAP_CH1_JEIDA;
- break;
- default:
- dev_err(dev, "data mapping not specified or invalid\n");
- return -EINVAL;
+ channel->bus_format = of_get_bus_format(dev, child);
+ if (channel->bus_format == -EINVAL) {
+ /*
+ * If no bus format was specified in the device tree,
+ * we can still get it from the connected panel later.
+ */
+ if (channel->panel && channel->panel->funcs &&
+ channel->panel->funcs->get_modes)
+ channel->bus_format = 0;
+ }
+ if (channel->bus_format < 0) {
+ dev_err(dev, "could not determine data mapping: %d\n",
+ channel->bus_format);
+ return channel->bus_format;
}
ret = imx_ldb_register(drm, channel);
--
2.1.4
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