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Subject[PATCH v2 01/15] drm/mxsfb: Update mxsfb to support a bridge
Date
Currently, the MXSFB DRM driver only supports a panel. But, its output
display signal can also be redirected to another encoder, like a DSI
controller. In this case, that DSI controller may act like a drm_bridge.
In order support this use-case too, this patch adds support for drm_bridge
in mxsfb.

Signed-off-by: Robert Chiras <robert.chiras@nxp.com>
Tested-by: Guido Günther <agx@sigxcpu.org>
---
drivers/gpu/drm/mxsfb/mxsfb_crtc.c | 17 +++++++++++---
drivers/gpu/drm/mxsfb/mxsfb_drv.c | 46 +++++++++++++++++++++++++++++++++-----
drivers/gpu/drm/mxsfb/mxsfb_drv.h | 4 +++-
drivers/gpu/drm/mxsfb/mxsfb_out.c | 26 +++++++++++----------
4 files changed, 72 insertions(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/mxsfb/mxsfb_crtc.c b/drivers/gpu/drm/mxsfb/mxsfb_crtc.c
index 1242156..de09b93 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_crtc.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_crtc.c
@@ -95,8 +95,11 @@ static void mxsfb_set_bus_fmt(struct mxsfb_drm_private *mxsfb)

reg = readl(mxsfb->base + LCDC_CTRL);

- if (mxsfb->connector.display_info.num_bus_formats)
- bus_format = mxsfb->connector.display_info.bus_formats[0];
+ if (mxsfb->connector->display_info.num_bus_formats)
+ bus_format = mxsfb->connector->display_info.bus_formats[0];
+
+ DRM_DEV_DEBUG_DRIVER(drm->dev, "Using bus_format: 0x%08X\n",
+ bus_format);

reg &= ~CTRL_BUS_WIDTH_MASK;
switch (bus_format) {
@@ -204,8 +207,9 @@ static dma_addr_t mxsfb_get_fb_paddr(struct mxsfb_drm_private *mxsfb)

static void mxsfb_crtc_mode_set_nofb(struct mxsfb_drm_private *mxsfb)
{
+ struct drm_device *drm = mxsfb->pipe.crtc.dev;
struct drm_display_mode *m = &mxsfb->pipe.crtc.state->adjusted_mode;
- const u32 bus_flags = mxsfb->connector.display_info.bus_flags;
+ const u32 bus_flags = mxsfb->connector->display_info.bus_flags;
u32 vdctrl0, vsync_pulse_len, hsync_pulse_len;
int err;

@@ -229,6 +233,13 @@ static void mxsfb_crtc_mode_set_nofb(struct mxsfb_drm_private *mxsfb)

clk_set_rate(mxsfb->clk, m->crtc_clock * 1000);

+ DRM_DEV_DEBUG_DRIVER(drm->dev, "Pixel clock: %dkHz (actual: %dkHz)\n",
+ m->crtc_clock,
+ (int)(clk_get_rate(mxsfb->clk) / 1000));
+ DRM_DEV_DEBUG_DRIVER(drm->dev, "Connector bus_flags: 0x%08X\n",
+ bus_flags);
+ DRM_DEV_DEBUG_DRIVER(drm->dev, "Mode flags: 0x%08X\n", m->flags);
+
writel(TRANSFER_COUNT_SET_VCOUNT(m->crtc_vdisplay) |
TRANSFER_COUNT_SET_HCOUNT(m->crtc_hdisplay),
mxsfb->base + mxsfb->devdata->transfer_count);
diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
index 878ef68..9dc69b7 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
@@ -101,9 +101,25 @@ static void mxsfb_pipe_enable(struct drm_simple_display_pipe *pipe,
struct drm_crtc_state *crtc_state,
struct drm_plane_state *plane_state)
{
+ struct drm_connector *connector;
struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
struct drm_device *drm = pipe->plane.dev;

+ if (!mxsfb->connector) {
+ list_for_each_entry(connector,
+ &drm->mode_config.connector_list,
+ head)
+ if (connector->encoder == &mxsfb->pipe.encoder) {
+ mxsfb->connector = connector;
+ break;
+ }
+ }
+
+ if (!mxsfb->connector) {
+ dev_warn(drm->dev, "No connector attached, using default\n");
+ mxsfb->connector = &mxsfb->panel_connector;
+ }
+
pm_runtime_get_sync(drm->dev);
drm_panel_prepare(mxsfb->panel);
mxsfb_crtc_enable(mxsfb);
@@ -129,6 +145,9 @@ static void mxsfb_pipe_disable(struct drm_simple_display_pipe *pipe)
drm_crtc_send_vblank_event(crtc, event);
}
spin_unlock_irq(&drm->event_lock);
+
+ if (mxsfb->connector != &mxsfb->panel_connector)
+ mxsfb->connector = NULL;
}

static void mxsfb_pipe_update(struct drm_simple_display_pipe *pipe,
@@ -226,16 +245,33 @@ static int mxsfb_load(struct drm_device *drm, unsigned long flags)

ret = drm_simple_display_pipe_init(drm, &mxsfb->pipe, &mxsfb_funcs,
mxsfb_formats, ARRAY_SIZE(mxsfb_formats), NULL,
- &mxsfb->connector);
+ mxsfb->connector);
if (ret < 0) {
dev_err(drm->dev, "Cannot setup simple display pipe\n");
goto err_vblank;
}

- ret = drm_panel_attach(mxsfb->panel, &mxsfb->connector);
- if (ret) {
- dev_err(drm->dev, "Cannot connect panel\n");
- goto err_vblank;
+ /*
+ * Attach panel only if there is one.
+ * If there is no panel attach, it must be a bridge. In this case, we
+ * need a reference to its connector for a proper initialization.
+ * We will do this check in pipe->enable(), since the connector won't
+ * be attached to an encoder until then.
+ */
+
+ if (mxsfb->panel) {
+ ret = drm_panel_attach(mxsfb->panel, mxsfb->connector);
+ if (ret) {
+ dev_err(drm->dev, "Cannot connect panel: %d\n", ret);
+ goto err_vblank;
+ }
+ } else if (mxsfb->bridge) {
+ ret = drm_simple_display_pipe_attach_bridge(&mxsfb->pipe,
+ mxsfb->bridge);
+ if (ret) {
+ dev_err(drm->dev, "Cannot connect bridge: %d\n", ret);
+ goto err_vblank;
+ }
}

drm->mode_config.min_width = MXSFB_MIN_XRES;
diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.h b/drivers/gpu/drm/mxsfb/mxsfb_drv.h
index d975300..0b65b51 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_drv.h
+++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.h
@@ -27,8 +27,10 @@ struct mxsfb_drm_private {
struct clk *clk_disp_axi;

struct drm_simple_display_pipe pipe;
- struct drm_connector connector;
+ struct drm_connector panel_connector;
+ struct drm_connector *connector;
struct drm_panel *panel;
+ struct drm_bridge *bridge;
};

int mxsfb_setup_crtc(struct drm_device *dev);
diff --git a/drivers/gpu/drm/mxsfb/mxsfb_out.c b/drivers/gpu/drm/mxsfb/mxsfb_out.c
index 231d016..9506eec 100644
--- a/drivers/gpu/drm/mxsfb/mxsfb_out.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_out.c
@@ -21,7 +21,8 @@
static struct mxsfb_drm_private *
drm_connector_to_mxsfb_drm_private(struct drm_connector *connector)
{
- return container_of(connector, struct mxsfb_drm_private, connector);
+ return container_of(connector, struct mxsfb_drm_private,
+ panel_connector);
}

static int mxsfb_panel_get_modes(struct drm_connector *connector)
@@ -76,22 +77,23 @@ static const struct drm_connector_funcs mxsfb_panel_connector_funcs = {
int mxsfb_create_output(struct drm_device *drm)
{
struct mxsfb_drm_private *mxsfb = drm->dev_private;
- struct drm_panel *panel;
int ret;

- ret = drm_of_find_panel_or_bridge(drm->dev->of_node, 0, 0, &panel, NULL);
+ ret = drm_of_find_panel_or_bridge(drm->dev->of_node, 0, 0,
+ &mxsfb->panel, &mxsfb->bridge);
if (ret)
return ret;

- mxsfb->connector.dpms = DRM_MODE_DPMS_OFF;
- mxsfb->connector.polled = 0;
- drm_connector_helper_add(&mxsfb->connector,
- &mxsfb_panel_connector_helper_funcs);
- ret = drm_connector_init(drm, &mxsfb->connector,
- &mxsfb_panel_connector_funcs,
- DRM_MODE_CONNECTOR_Unknown);
- if (!ret)
- mxsfb->panel = panel;
+ if (mxsfb->panel) {
+ mxsfb->connector = &mxsfb->panel_connector;
+ mxsfb->connector->dpms = DRM_MODE_DPMS_OFF;
+ mxsfb->connector->polled = 0;
+ drm_connector_helper_add(mxsfb->connector,
+ &mxsfb_panel_connector_helper_funcs);
+ ret = drm_connector_init(drm, mxsfb->connector,
+ &mxsfb_panel_connector_funcs,
+ DRM_MODE_CONNECTOR_Unknown);
+ }

return ret;
}
--
2.7.4
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