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authorMaxime Ripard <maxime@cerno.tech>2021-10-25 18:15:35 +0300
committerMaxime Ripard <maxime@cerno.tech>2021-10-27 23:07:58 +0300
commit4280e1a0ba1dca1e7c4c35d0c790dc8977d840a0 (patch)
tree0fbccb6017fe5d1bc339c0c47efe4174123f2af6 /drivers/gpu/drm/hisilicon
parent4d77688ff27c7d030b5113f0cf0b0a2a433b2a62 (diff)
downloadlinux-4280e1a0ba1dca1e7c4c35d0c790dc8977d840a0.tar.xz
drm/kirin: dsi: Adjust probe order
Without proper care and an agreement between how DSI hosts and devices drivers register their MIPI-DSI entities and potential components, we can end up in a situation where the drivers can never probe. Most drivers were taking evasive maneuvers to try to workaround this, but not all of them were following the same conventions, resulting in various incompatibilities between DSI hosts and devices. Now that we have a sequence agreed upon and documented, let's convert kirin to it. Acked-by: John Stultz <john.stultz@linaro.org> Tested-by: John Stultz <john.stultz@linaro.org> Signed-off-by: Maxime Ripard <maxime@cerno.tech> Link: https://patchwork.freedesktop.org/patch/msgid/20211025151536.1048186-21-maxime@cerno.tech
Diffstat (limited to 'drivers/gpu/drm/hisilicon')
-rw-r--r--drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c52
1 files changed, 33 insertions, 19 deletions
diff --git a/drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c b/drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c
index 952cfdb1961d..1d556482bb46 100644
--- a/drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c
+++ b/drivers/gpu/drm/hisilicon/kirin/dw_drm_dsi.c
@@ -81,7 +81,7 @@ struct dsi_hw_ctx {
struct dw_dsi {
struct drm_encoder encoder;
- struct drm_bridge *bridge;
+ struct device *dev;
struct mipi_dsi_host host;
struct drm_display_mode cur_mode;
struct dsi_hw_ctx *ctx;
@@ -720,10 +720,13 @@ static int dw_drm_encoder_init(struct device *dev,
return 0;
}
+static const struct component_ops dsi_ops;
static int dsi_host_attach(struct mipi_dsi_host *host,
struct mipi_dsi_device *mdsi)
{
struct dw_dsi *dsi = host_to_dsi(host);
+ struct device *dev = host->dev;
+ int ret;
if (mdsi->lanes < 1 || mdsi->lanes > 4) {
DRM_ERROR("dsi device params invalid\n");
@@ -734,13 +737,20 @@ static int dsi_host_attach(struct mipi_dsi_host *host,
dsi->format = mdsi->format;
dsi->mode_flags = mdsi->mode_flags;
+ ret = component_add(dev, &dsi_ops);
+ if (ret)
+ return ret;
+
return 0;
}
static int dsi_host_detach(struct mipi_dsi_host *host,
struct mipi_dsi_device *mdsi)
{
- /* do nothing */
+ struct device *dev = host->dev;
+
+ component_del(dev, &dsi_ops);
+
return 0;
}
@@ -768,7 +778,17 @@ static int dsi_host_init(struct device *dev, struct dw_dsi *dsi)
static int dsi_bridge_init(struct drm_device *dev, struct dw_dsi *dsi)
{
struct drm_encoder *encoder = &dsi->encoder;
- struct drm_bridge *bridge = dsi->bridge;
+ struct drm_bridge *bridge;
+ struct device_node *np = dsi->dev->of_node;
+ int ret;
+
+ /*
+ * Get the endpoint node. In our case, dsi has one output port1
+ * to which the external HDMI bridge is connected.
+ */
+ ret = drm_of_find_panel_or_bridge(np, 1, 0, NULL, &bridge);
+ if (ret)
+ return ret;
/* associate the bridge to dsi encoder */
return drm_bridge_attach(encoder, bridge, NULL, 0);
@@ -785,10 +805,6 @@ static int dsi_bind(struct device *dev, struct device *master, void *data)
if (ret)
return ret;
- ret = dsi_host_init(dev, dsi);
- if (ret)
- return ret;
-
ret = dsi_bridge_init(drm_dev, dsi);
if (ret)
return ret;
@@ -809,17 +825,7 @@ static const struct component_ops dsi_ops = {
static int dsi_parse_dt(struct platform_device *pdev, struct dw_dsi *dsi)
{
struct dsi_hw_ctx *ctx = dsi->ctx;
- struct device_node *np = pdev->dev.of_node;
struct resource *res;
- int ret;
-
- /*
- * Get the endpoint node. In our case, dsi has one output port1
- * to which the external HDMI bridge is connected.
- */
- ret = drm_of_find_panel_or_bridge(np, 1, 0, NULL, &dsi->bridge);
- if (ret)
- return ret;
ctx->pclk = devm_clk_get(&pdev->dev, "pclk");
if (IS_ERR(ctx->pclk)) {
@@ -852,6 +858,7 @@ static int dsi_probe(struct platform_device *pdev)
dsi = &data->dsi;
ctx = &data->ctx;
dsi->ctx = ctx;
+ dsi->dev = &pdev->dev;
ret = dsi_parse_dt(pdev, dsi);
if (ret)
@@ -859,12 +866,19 @@ static int dsi_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, data);
- return component_add(&pdev->dev, &dsi_ops);
+ ret = dsi_host_init(&pdev->dev, dsi);
+ if (ret)
+ return ret;
+
+ return 0;
}
static int dsi_remove(struct platform_device *pdev)
{
- component_del(&pdev->dev, &dsi_ops);
+ struct dsi_data *data = platform_get_drvdata(pdev);
+ struct dw_dsi *dsi = &data->dsi;
+
+ mipi_dsi_host_unregister(&dsi->host);
return 0;
}