[PATCH 16/17] drm/sun4i: tcon-top: Remove mux configuration at probe time

Jernej Skrabec
2018-07-06T17:51:12Z

Now that R40 TCON migrated to runtime mux configuration, old code can be
removed.

Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
---
drivers/gpu/drm/sun4i/sun8i_tcon_top.c | 81 +++-----------------------
1 file changed, 7 insertions(+), 74 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun8i_tcon_top.c b/drivers/gpu/drm/sun4i/sun8i_tcon_top.c
index c09b15b64192..78795d6cb174 100644
--- a/drivers/gpu/drm/sun4i/sun8i_tcon_top.c
+++ b/drivers/gpu/drm/sun4i/sun8i_tcon_top.c
@@ -87,34 +87,6 @@ int sun8i_tcon_top_de_config(struct device *dev, int mixer, int tcon)
}
EXPORT_SYMBOL(sun8i_tcon_top_de_config);

-static int sun8i_tcon_top_get_connected_ep_id(struct device_node *node,
- int port_id)
-{
- struct device_node *ep, *remote, *port;
- struct of_endpoint endpoint;
-
- port = of_graph_get_port_by_id(node, port_id);
- if (!port)
- return -ENOENT;
-
- for_each_available_child_of_node(port, ep) {
- remote = of_graph_get_remote_port_parent(ep);
- if (!remote)
- continue;
-
- if (of_device_is_available(remote)) {
- of_graph_parse_endpoint(ep, &endpoint);
-
- of_node_put(remote);
-
- return endpoint.id;
- }
-
- of_node_put(remote);
- }
-
- return -ENOENT;
-}

static struct clk_hw *sun8i_tcon_top_register_gate(struct device *dev,
const char *parent,
@@ -149,11 +121,9 @@ static int sun8i_tcon_top_bind(struct device *dev, struct device *master,
struct platform_device *pdev = to_platform_device(dev);
struct clk_hw_onecell_data *clk_data;
struct sun8i_tcon_top *tcon_top;
- bool mixer0_unused = false;
struct resource *res;
void __iomem *regs;
- int ret, i, id;
- u32 val;
+ int ret, i;

tcon_top = devm_kzalloc(dev, sizeof(*tcon_top), GFP_KERNEL);
if (!tcon_top)
@@ -198,49 +168,12 @@ static int sun8i_tcon_top_bind(struct device *dev, struct device *master,
goto err_assert_reset;
}

- val = 0;
-
- /* check if HDMI mux output is connected */
- if (sun8i_tcon_top_get_connected_ep_id(dev->of_node, 5) >= 0) {
- /* find HDMI input endpoint id, if it is connected at all*/
- id = sun8i_tcon_top_get_connected_ep_id(dev->of_node, 4);
- if (id >= 0)
- val = FIELD_PREP(TCON_TOP_HDMI_SRC_MSK, id + 1);
- else
- DRM_DEBUG_DRIVER("TCON TOP HDMI input is not connected\n");
- } else {
- DRM_DEBUG_DRIVER("TCON TOP HDMI output is not connected\n");
- }
-
- writel(val, regs + TCON_TOP_GATE_SRC_REG);
-
- val = 0;
-
- /* process mixer0 mux output */
- id = sun8i_tcon_top_get_connected_ep_id(dev->of_node, 1);
- if (id >= 0) {
- val = FIELD_PREP(TCON_TOP_PORT_DE0_MSK, id);
- } else {
- DRM_DEBUG_DRIVER("TCON TOP mixer0 output is not connected\n");
- mixer0_unused = true;
- }
-
- /* process mixer1 mux output */
- id = sun8i_tcon_top_get_connected_ep_id(dev->of_node, 3);
- if (id >= 0) {
- val |= FIELD_PREP(TCON_TOP_PORT_DE1_MSK, id);
-
- /*
- * mixer0 mux has priority over mixer1 mux. We have to
- * make sure mixer0 doesn't overtake TCON from mixer1.
- */
- if (mixer0_unused && id == 0)
- val |= FIELD_PREP(TCON_TOP_PORT_DE0_MSK, 1);
- } else {
- DRM_DEBUG_DRIVER("TCON TOP mixer1 output is not connected\n");
- }
-
- writel(val, regs + TCON_TOP_PORT_SEL_REG);
+ /*
+ * Default register values might have some reserved bits set, which
+ * prevents TCON TOP from working properly. Set them to 0 here.
+ */
+ writel(0, regs + TCON_TOP_GATE_SRC_REG);
+ writel(0, regs + TCON_TOP_PORT_SEL_REG);

/*
* TCON TOP has two muxes, which select parent clock for each TCON TV
--
2.18.0