From: Georgi Djakov <georgi.djakov@xxxxxxxxxx>
The interconnect API provides an interface for consumer drivers to
express their bandwidth needs in the SoC. This data is aggregated
and the on-chip interconnect hardware is configured to the most
appropriate power/performance profile.
Use the API to configure the interconnects and request bandwidth
between DDR and the display hardware (MDP port(s) and rotator
downscaler).
v2: update the path names to be consistent with dpu, handle the NULL
path case, updated commit msg from Georgi.
v3: split out icc setup into it's own function, and rework logic
slightly so no interconnect paths is not fatal.
Signed-off-by: Georgi Djakov <georgi.djakov@xxxxxxxxxx>
Signed-off-by: Rob Clark <robdclark@xxxxxxxxxxxx>
---
drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c | 38 ++++++++++++++++++++++++
1 file changed, 38 insertions(+)
diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
index 97179bec8902..1c55401956c4 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
@@ -16,6 +16,7 @@
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
+#include <linux/interconnect.h>
#include <linux/of_irq.h>
#include "msm_drv.h"
@@ -1048,9 +1049,46 @@ static const struct component_ops mdp5_ops = {
.unbind = mdp5_unbind,
};
+static int mdp5_setup_interconnect(struct platform_device *pdev)
+{
+ struct icc_path *path0 = of_icc_get(&pdev->dev, "mdp0-mem");
+ struct icc_path *path1 = of_icc_get(&pdev->dev, "mdp1-mem");
+ struct icc_path *path_rot = of_icc_get(&pdev->dev, "rotator-mem");
+
+ if (IS_ERR(path0))
+ return PTR_ERR(path0);
+
+ if (!path0) {
+ /* no interconnect support is not necessarily a fatal
+ * condition, the platform may simply not have an
+ * interconnect driver yet. But warn about it in case
+ * bootloader didn't setup bus clocks high enough for
+ * scanout.
+ */
+ dev_warn(&pdev->dev, "No interconnect support may cause display underflows!\n");
+ return 0;
+ }
+
+ icc_set_bw(path0, 0, MBps_to_icc(6400));
+
+ if (!IS_ERR_OR_NULL(path1))
+ icc_set_bw(path1, 0, MBps_to_icc(6400));
+ if (!IS_ERR_OR_NULL(path_rot))
+ icc_set_bw(path_rot, 0, MBps_to_icc(6400));
+
+ return 0;
+}
+
static int mdp5_dev_probe(struct platform_device *pdev)
{
+ int ret;
+
DBG("");
+
+ ret = mdp5_setup_interconnect(pdev);
+ if (ret)
+ return ret;
+
return component_add(&pdev->dev, &mdp5_ops);
}
--
2.20.1
