On Wed, Jul 11, 2018 at 3:10 PM, Jernej Škrabec jernej.skrabec@siol.net wrote:
Dne sreda, 11. julij 2018 ob 05:11:56 CEST je Chen-Yu Tsai napisal(a):
On Wed, Jul 11, 2018 at 4:35 AM, Jernej Skrabec jernej.skrabec@siol.net
wrote:
Currently, TCON supports 2 ways to match TCON with engine (mixer in this case). Old way is to just traverse of graph backwards and compare node pointer. New way is to match TCON and engine by their respective ids. All SoCs with DE2 enabled till now used the old way, which means mixer id was never used and thus never implemented.
However, for R40, only the new way will be used. To prepare for that, implement mixer id fetching from DT.
Signed-off-by: Jernej Skrabec jernej.skrabec@siol.net
drivers/gpu/drm/sun4i/sun8i_mixer.c | 40 +++++++++++++++++++++++++++-- 1 file changed, 38 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.c b/drivers/gpu/drm/sun4i/sun8i_mixer.c index aa81b9838ae8..4bd4d8ccb34f 100644 --- a/drivers/gpu/drm/sun4i/sun8i_mixer.c +++ b/drivers/gpu/drm/sun4i/sun8i_mixer.c @@ -22,6 +22,7 @@
#include <linux/component.h> #include <linux/dma-mapping.h> #include <linux/of_device.h>
+#include <linux/of_graph.h>
#include <linux/reset.h>
#include "sun4i_drv.h"
@@ -322,6 +323,42 @@ static struct regmap_config sun8i_mixer_regmap_config = {> .max_register = 0xbfffc, /* guessed */
};
+static int sun8i_mixer_of_get_id(struct device_node *node) +{
struct device_node *port, *ep;int ret = -EINVAL;/* output is port 1 */port = of_graph_get_port_by_id(node, 1);if (!port)return -EINVAL;/* try to find downstream endpoint */for_each_available_child_of_node(port, ep) {struct device_node *remote;u32 reg;remote = of_graph_get_remote_endpoint(ep);if (!remote)continue;ret = of_property_read_u32(remote, "reg", ®);if (!ret) {of_node_put(remote);of_node_put(ep);of_node_put(port);return reg;}of_node_put(remote);}of_node_put(port);return ret;+}
The above looks good.
static int sun8i_mixer_bind(struct device *dev, struct device *master,
void *data){
@@ -353,8 +390,7 @@ static int sun8i_mixer_bind(struct device *dev, struct device *master,> dev_set_drvdata(dev, mixer); mixer->engine.ops = &sun8i_engine_ops; mixer->engine.node = dev->of_node;
/* The ID of the mixer currently doesn't matter */mixer->engine.id = -1;
mixer->engine.id = sun8i_mixer_of_get_id(dev->of_node);Should you be handling error codes?
Sadly, no. Other supported DE2 SoC miss reg property in DT and it would break them. Additionally, V3s has only one mixer and thus technically doesn't violate binding with omiting mixer id.
Anyway, it was -1 all the time before and not really used, so having negative value doesn't change anything for other SoCs. If this fails and it's needed, it would stop at mixer <-> TCON matching stage anyway.
I guess I should add comment for that.
Yes. Please. We'll leave the rest till later. I plan to fix up the missing IDs for all the other SoCs anyway.
ChenYu