Now that bridges can expose the bus format/flags they expect, we can
use those instead of the relying on the display_info provided by the
connector (which is only valid if the encoder is directly connected
to bridge element driving the panel/display).
We also explicitly expose the bus formats supported by our encoder by
filling encoder->output_bus_caps with proper info.
Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
---
Changes in v7:
* Add an imx_pd_format_supported() helper (suggested by Philipp)
* Simplify imx_pd_bridge_atomic_get_output_bus_fmts() (suggested by Philipp)
* Simplify imx_pd_bridge_atomic_get_input_bus_fmts()
* Explicitly set the duplicate/destro_state() and reset() hooks
Changes in v3 (all suggested by Philipp):
* Adjust to match core changes
* Propagate output format to input format
* Pick a default value when output_fmt = _FIXED
* Add missing BGR888 and GBR888 fmts to imx_pd_bus_fmts[]
Changes in v2:
* Adjust things to match the new bus-format negotiation infra
---
drivers/gpu/drm/imx/parallel-display.c | 176 +++++++++++++++++++++----
1 file changed, 151 insertions(+), 25 deletions(-)
diff --git a/drivers/gpu/drm/imx/parallel-display.c b/drivers/gpu/drm/imx/parallel-display.c
index 3dca424059f7..031579aa7fc2 100644
--- a/drivers/gpu/drm/imx/parallel-display.c
+++ b/drivers/gpu/drm/imx/parallel-display.c
@@ -24,6 +24,7 @@
struct imx_parallel_display {
struct drm_connector connector;
struct drm_encoder encoder;
+ struct drm_bridge bridge;
struct device *dev;
void *edid;
int edid_len;
@@ -31,7 +32,7 @@ struct imx_parallel_display {
u32 bus_flags;
struct drm_display_mode mode;
struct drm_panel *panel;
- struct drm_bridge *bridge;
+ struct drm_bridge *next_bridge;
};
static inline struct imx_parallel_display *con_to_imxpd(struct drm_connector *c)
@@ -44,6 +45,11 @@ static inline struct imx_parallel_display *enc_to_imxpd(struct drm_encoder *e)
return container_of(e, struct imx_parallel_display, encoder);
}
+static inline struct imx_parallel_display *bridge_to_imxpd(struct drm_bridge *b)
+{
+ return container_of(b, struct imx_parallel_display, bridge);
+}
+
static int imx_pd_connector_get_modes(struct drm_connector *connector)
{
struct imx_parallel_display *imxpd = con_to_imxpd(connector);
@@ -89,37 +95,148 @@ static struct drm_encoder *imx_pd_connector_best_encoder(
return &imxpd->encoder;
}
-static void imx_pd_encoder_enable(struct drm_encoder *encoder)
+static void imx_pd_bridge_enable(struct drm_bridge *bridge)
{
- struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
+ struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
drm_panel_prepare(imxpd->panel);
drm_panel_enable(imxpd->panel);
}
-static void imx_pd_encoder_disable(struct drm_encoder *encoder)
+static void imx_pd_bridge_disable(struct drm_bridge *bridge)
{
- struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
+ struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
drm_panel_disable(imxpd->panel);
drm_panel_unprepare(imxpd->panel);
}
-static int imx_pd_encoder_atomic_check(struct drm_encoder *encoder,
- struct drm_crtc_state *crtc_state,
- struct drm_connector_state *conn_state)
+static const u32 imx_pd_bus_fmts[] = {
+ MEDIA_BUS_FMT_RGB888_1X24,
+ MEDIA_BUS_FMT_BGR888_1X24,
+ MEDIA_BUS_FMT_GBR888_1X24,
+ MEDIA_BUS_FMT_RGB666_1X18,
+ MEDIA_BUS_FMT_RGB666_1X24_CPADHI,
+ MEDIA_BUS_FMT_RGB565_1X16,
+};
+
+static u32 *
+imx_pd_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 imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
struct drm_display_info *di = &conn_state->connector->display_info;
- struct imx_parallel_display *imxpd = enc_to_imxpd(encoder);
+ struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
+ u32 *output_fmts;
- if (!imxpd->bus_format && di->num_bus_formats) {
- imx_crtc_state->bus_flags = di->bus_flags;
- imx_crtc_state->bus_format = di->bus_formats[0];
- } else {
- imx_crtc_state->bus_flags = imxpd->bus_flags;
- imx_crtc_state->bus_format = imxpd->bus_format;
+ if (!imxpd->bus_format && !di->num_bus_formats) {
+ *num_output_fmts = ARRAY_SIZE(imx_pd_bus_fmts);
+ return kmemdup(imx_pd_bus_fmts, sizeof(imx_pd_bus_fmts),
+ GFP_KERNEL);
+ }
+
+ *num_output_fmts = 1;
+ output_fmts = kcalloc(*num_output_fmts, sizeof(*output_fmts),
+ GFP_KERNEL);
+ if (!output_fmts)
+ return NULL;
+
+ if (!imxpd->bus_format && di->num_bus_formats)
+ output_fmts[0] = di->bus_formats[0];
+ else
+ output_fmts[0] = imxpd->bus_format;
+
+ return output_fmts;
+}
+
+static bool imx_pd_format_supported(u32 output_fmt)
+{
+ unsigned int i;
+
+ for (i = 0; i < ARRAY_SIZE(imx_pd_bus_fmts); i++) {
+ if (imx_pd_bus_fmts[i] == output_fmt)
+ return true;
}
+
+ return false;
+}
+
+static u32 *
+imx_pd_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)
+{
+ struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
+ u32 *input_fmts;
+
+ /*
+ * If the next bridge does not support bus format negotiation, let's
+ * use the static bus format definition (imxpd->bus_format) if it's
+ * specified, RGB888 when it's not.
+ */
+ if (output_fmt == MEDIA_BUS_FMT_FIXED)
+ output_fmt = imxpd->bus_format ? : MEDIA_BUS_FMT_RGB888_1X24;
+
+ /* Now make sure the requested output format is supported. */
+ if ((imxpd->bus_format && imxpd->bus_format != output_fmt) ||
+ !imx_pd_format_supported(output_fmt)) {
+ *num_input_fmts = 0;
+ return NULL;
+ }
+
+ *num_input_fmts = 1;
+ input_fmts = kcalloc(*num_input_fmts, sizeof(*input_fmts),
+ GFP_KERNEL);
+ if (!input_fmts)
+ return NULL;
+
+ input_fmts[0] = output_fmt;
+ return input_fmts;
+}
+
+static int imx_pd_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 imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
+ struct drm_display_info *di = &conn_state->connector->display_info;
+ struct imx_parallel_display *imxpd = bridge_to_imxpd(bridge);
+ struct drm_bridge_state *next_bridge_state = NULL;
+ struct drm_bridge *next_bridge;
+ u32 bus_flags, bus_fmt;
+
+ next_bridge = drm_bridge_get_next_bridge(bridge);
+ if (next_bridge)
+ next_bridge_state = drm_atomic_get_new_bridge_state(crtc_state->state,
+ next_bridge);
+
+ if (next_bridge_state)
+ bus_flags = next_bridge_state->input_bus_cfg.flags;
+ else if (!imxpd->bus_format && di->num_bus_formats)
+ bus_flags = di->bus_flags;
+ else
+ bus_flags = imxpd->bus_flags;
+
+ bus_fmt = bridge_state->input_bus_cfg.format;
+ if (!imx_pd_format_supported(bus_fmt))
+ return -EINVAL;
+
+ if (bus_flags &
+ ~(DRM_BUS_FLAG_DE_LOW | DRM_BUS_FLAG_DE_HIGH |
+ DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE |
+ DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE))
+ return -EINVAL;
+
+ bridge_state->output_bus_cfg.flags = bus_flags;
+ bridge_state->input_bus_cfg.flags = bus_flags;
+ imx_crtc_state->bus_flags = bus_flags;
+ imx_crtc_state->bus_format = bridge_state->input_bus_cfg.format;
imx_crtc_state->di_hsync_pin = 2;
imx_crtc_state->di_vsync_pin = 3;
@@ -143,10 +260,15 @@ static const struct drm_encoder_funcs imx_pd_encoder_funcs = {
.destroy = imx_drm_encoder_destroy,
};
-static const struct drm_encoder_helper_funcs imx_pd_encoder_helper_funcs = {
- .enable = imx_pd_encoder_enable,
- .disable = imx_pd_encoder_disable,
- .atomic_check = imx_pd_encoder_atomic_check,
+static const struct drm_bridge_funcs imx_pd_bridge_funcs = {
+ .enable = imx_pd_bridge_enable,
+ .disable = imx_pd_bridge_disable,
+ .atomic_reset = drm_atomic_helper_bridge_reset,
+ .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
+ .atomic_check = imx_pd_bridge_atomic_check,
+ .atomic_get_input_bus_fmts = imx_pd_bridge_atomic_get_input_bus_fmts,
+ .atomic_get_output_bus_fmts = imx_pd_bridge_atomic_get_output_bus_fmts,
};
static int imx_pd_register(struct drm_device *drm,
@@ -166,11 +288,13 @@ static int imx_pd_register(struct drm_device *drm,
*/
imxpd->connector.dpms = DRM_MODE_DPMS_OFF;
- drm_encoder_helper_add(encoder, &imx_pd_encoder_helper_funcs);
drm_encoder_init(drm, encoder, &imx_pd_encoder_funcs,
DRM_MODE_ENCODER_NONE, NULL);
- if (!imxpd->bridge) {
+ imxpd->bridge.funcs = &imx_pd_bridge_funcs;
+ drm_bridge_attach(encoder, &imxpd->bridge, NULL);
+
+ if (!imxpd->next_bridge) {
drm_connector_helper_add(&imxpd->connector,
&imx_pd_connector_helper_funcs);
drm_connector_init(drm, &imxpd->connector,
@@ -181,8 +305,9 @@ static int imx_pd_register(struct drm_device *drm,
if (imxpd->panel)
drm_panel_attach(imxpd->panel, &imxpd->connector);
- if (imxpd->bridge) {
- ret = drm_bridge_attach(encoder, imxpd->bridge, NULL);
+ if (imxpd->next_bridge) {
+ ret = drm_bridge_attach(encoder, imxpd->next_bridge,
+ &imxpd->bridge);
if (ret < 0) {
dev_err(imxpd->dev, "failed to attach bridge: %d\n",
ret);
@@ -227,7 +352,8 @@ static int imx_pd_bind(struct device *dev, struct device *master, void *data)
imxpd->bus_format = bus_format;
/* port@1 is the output port */
- ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel, &imxpd->bridge);
+ ret = drm_of_find_panel_or_bridge(np, 1, 0, &imxpd->panel,
+ &imxpd->next_bridge);
if (ret && ret != -ENODEV)
return ret;
--
2.24.1
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