Encoder drivers will progressively transition to the drm_bridge
interface in place of the drm_encoder one.
Let's start with the VC4 driver, and use the ->pre_{enable,disable}()
hooks to get rid of the hack resetting encoder->bridge.next (which was
needed to control the encoder/bridge enable/disable sequence).
Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
---
Changes in v3:
* Embed a drm_bridge object in vc4_dsi since drm_encoder no longer has
a dummy bridge
Changes in v2:
* New patch (replaces "drm/vc4: Get rid of the dsi->bridge field")
---
drivers/gpu/drm/vc4/vc4_dsi.c | 88 +++++++++++++++++++++--------------
1 file changed, 52 insertions(+), 36 deletions(-)
diff --git a/drivers/gpu/drm/vc4/vc4_dsi.c b/drivers/gpu/drm/vc4/vc4_dsi.c
index c9ba83ed49b9..49f8a313e759 100644
--- a/drivers/gpu/drm/vc4/vc4_dsi.c
+++ b/drivers/gpu/drm/vc4/vc4_dsi.c
@@ -498,7 +498,11 @@ struct vc4_dsi {
struct mipi_dsi_host dsi_host;
struct drm_encoder *encoder;
- struct drm_bridge *bridge;
+
+ /* Embed a bridge object so we can implement bridge funcs instead of
+ * encoder ones.
+ */
+ struct drm_bridge bridge;
void __iomem *regs;
@@ -543,6 +547,11 @@ struct vc4_dsi {
struct debugfs_regset32 regset;
};
+static inline struct vc4_dsi *bridge_to_vc4_dsi(struct drm_bridge *bridge)
+{
+ return container_of(bridge, struct vc4_dsi, bridge);
+}
+
#define host_to_dsi(host) container_of(host, struct vc4_dsi, dsi_host)
static inline void
@@ -747,16 +756,11 @@ dsi_esc_timing(u32 ns)
return DIV_ROUND_UP(ns, ESC_TIME_NS);
}
-static void vc4_dsi_encoder_disable(struct drm_encoder *encoder)
+static void vc4_dsi_bridge_post_disable(struct drm_bridge *bridge)
{
- struct vc4_dsi_encoder *vc4_encoder = to_vc4_dsi_encoder(encoder);
- struct vc4_dsi *dsi = vc4_encoder->dsi;
+ struct vc4_dsi *dsi = bridge_to_vc4_dsi(bridge);
struct device *dev = &dsi->pdev->dev;
- drm_bridge_disable(dsi->bridge);
- vc4_dsi_ulps(dsi, true);
- drm_bridge_post_disable(dsi->bridge);
-
clk_disable_unprepare(dsi->pll_phy_clock);
clk_disable_unprepare(dsi->escape_clock);
clk_disable_unprepare(dsi->pixel_clock);
@@ -764,6 +768,13 @@ static void vc4_dsi_encoder_disable(struct drm_encoder *encoder)
pm_runtime_put(dev);
}
+static void vc4_dsi_bridge_disable(struct drm_bridge *bridge)
+{
+ struct vc4_dsi *dsi = bridge_to_vc4_dsi(bridge);
+
+ vc4_dsi_ulps(dsi, true);
+}
+
/* Extends the mode's blank intervals to handle BCM2835's integer-only
* DSI PLL divider.
*
@@ -777,12 +788,11 @@ static void vc4_dsi_encoder_disable(struct drm_encoder *encoder)
* higher-than-expected clock rate to the panel, but that's what the
* firmware does too.
*/
-static bool vc4_dsi_encoder_mode_fixup(struct drm_encoder *encoder,
- const struct drm_display_mode *mode,
- struct drm_display_mode *adjusted_mode)
+static bool vc4_dsi_bridge_mode_fixup(struct drm_bridge *bridge,
+ const struct drm_display_mode *mode,
+ struct drm_display_mode *adjusted_mode)
{
- struct vc4_dsi_encoder *vc4_encoder = to_vc4_dsi_encoder(encoder);
- struct vc4_dsi *dsi = vc4_encoder->dsi;
+ struct vc4_dsi *dsi = bridge_to_vc4_dsi(bridge);
struct clk *phy_parent = clk_get_parent(dsi->pll_phy_clock);
unsigned long parent_rate = clk_get_rate(phy_parent);
unsigned long pixel_clock_hz = mode->clock * 1000;
@@ -816,11 +826,11 @@ static bool vc4_dsi_encoder_mode_fixup(struct drm_encoder *encoder,
return true;
}
-static void vc4_dsi_encoder_enable(struct drm_encoder *encoder)
+static void vc4_dsi_bridge_pre_enable(struct drm_bridge *bridge)
{
+ struct drm_encoder *encoder = bridge->encoder;
struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
- struct vc4_dsi_encoder *vc4_encoder = to_vc4_dsi_encoder(encoder);
- struct vc4_dsi *dsi = vc4_encoder->dsi;
+ struct vc4_dsi *dsi = bridge_to_vc4_dsi(bridge);
struct device *dev = &dsi->pdev->dev;
bool debug_dump_regs = false;
unsigned long hs_clock;
@@ -1054,8 +1064,12 @@ static void vc4_dsi_encoder_enable(struct drm_encoder *encoder)
}
vc4_dsi_ulps(dsi, false);
+}
- drm_bridge_pre_enable(dsi->bridge);
+static void vc4_dsi_bridge_enable(struct drm_bridge *bridge)
+{
+ struct vc4_dsi *dsi = bridge_to_vc4_dsi(bridge);
+ bool debug_dump_regs = false;
if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO) {
DSI_PORT_WRITE(DISP0_CTRL,
@@ -1072,8 +1086,6 @@ static void vc4_dsi_encoder_enable(struct drm_encoder *encoder)
DSI_DISP0_ENABLE);
}
- drm_bridge_enable(dsi->bridge);
-
if (debug_dump_regs) {
struct drm_printer p = drm_info_printer(&dsi->pdev->dev);
dev_info(&dsi->pdev->dev, "DSI regs after:\n");
@@ -1290,10 +1302,12 @@ static const struct mipi_dsi_host_ops vc4_dsi_host_ops = {
.transfer = vc4_dsi_host_transfer,
};
-static const struct drm_encoder_helper_funcs vc4_dsi_encoder_helper_funcs = {
- .disable = vc4_dsi_encoder_disable,
- .enable = vc4_dsi_encoder_enable,
- .mode_fixup = vc4_dsi_encoder_mode_fixup,
+static const struct drm_bridge_funcs vc4_dsi_bridge_funcs = {
+ .pre_enable = vc4_dsi_bridge_pre_enable,
+ .enable = vc4_dsi_bridge_enable,
+ .disable = vc4_dsi_bridge_disable,
+ .post_disable = vc4_dsi_bridge_post_disable,
+ .mode_fixup = vc4_dsi_bridge_mode_fixup,
};
static const struct of_device_id vc4_dsi_dt_match[] = {
@@ -1445,6 +1459,7 @@ static int vc4_dsi_bind(struct device *dev, struct device *master, void *data)
struct vc4_dev *vc4 = to_vc4_dev(drm);
struct vc4_dsi *dsi = dev_get_drvdata(dev);
struct vc4_dsi_encoder *vc4_dsi_encoder;
+ struct drm_bridge *next_bridge;
struct drm_panel *panel;
const struct of_device_id *match;
dma_cap_mask_t dma_mask;
@@ -1561,7 +1576,7 @@ static int vc4_dsi_bind(struct device *dev, struct device *master, void *data)
}
ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0,
- &panel, &dsi->bridge);
+ &panel, &next_bridge);
if (ret) {
/* If the bridge or panel pointed by dev->of_node is not
* enabled, just return 0 here so that we don't prevent the DRM
@@ -1576,10 +1591,10 @@ static int vc4_dsi_bind(struct device *dev, struct device *master, void *data)
}
if (panel) {
- dsi->bridge = devm_drm_panel_bridge_add_typed(dev, panel,
+ next_bridge = devm_drm_panel_bridge_add_typed(dev, panel,
DRM_MODE_CONNECTOR_DSI);
- if (IS_ERR(dsi->bridge))
- return PTR_ERR(dsi->bridge);
+ if (IS_ERR(next_bridge))
+ return PTR_ERR(next_bridge);
}
/* The esc clock rate is supposed to always be 100Mhz. */
@@ -1598,19 +1613,20 @@ static int vc4_dsi_bind(struct device *dev, struct device *master, void *data)
drm_encoder_init(drm, dsi->encoder, &vc4_dsi_encoder_funcs,
DRM_MODE_ENCODER_DSI, NULL);
- drm_encoder_helper_add(dsi->encoder, &vc4_dsi_encoder_helper_funcs);
- ret = drm_bridge_attach(dsi->encoder, dsi->bridge, NULL);
+ /* Declare ourself as the first bridge element. */
+ dsi->bridge.funcs = &vc4_dsi_bridge_funcs;
+ ret = drm_bridge_attach(dsi->encoder, &dsi->bridge, NULL);
+ if (ret) {
+ dev_err(dev, "bridge attach failed: %d\n", ret);
+ return ret;
+ }
+
+ ret = drm_bridge_attach(dsi->encoder, next_bridge, &dsi->bridge);
if (ret) {
dev_err(dev, "bridge attach failed: %d\n", ret);
return ret;
}
- /* Disable the atomic helper calls into the bridge. We
- * manually call the bridge pre_enable / enable / etc. calls
- * from our driver, since we need to sequence them within the
- * encoder's enable/disable paths.
- */
- dsi->encoder->bridge = NULL;
if (dsi->port == 0)
vc4_debugfs_add_regset32(drm, "dsi0_regs", &dsi->regset);
@@ -1629,7 +1645,7 @@ static void vc4_dsi_unbind(struct device *dev, struct device *master,
struct vc4_dev *vc4 = to_vc4_dev(drm);
struct vc4_dsi *dsi = dev_get_drvdata(dev);
- if (dsi->bridge)
+ if (dsi->bridge.next)
pm_runtime_disable(dev);
vc4_dsi_encoder_destroy(dsi->encoder);
--
2.21.0
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