gpu: host1x: Program interrupt destinations on Tegra234

On Tegra234, each Host1x VM has 8 interrupt lines. Each syncpoint
can be configured with which interrupt line should be used for
threshold interrupt, allowing for load balancing.

For now, to keep backwards compatibility, just set all syncpoints
to the first interrupt.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

diff --git a/drivers/gpu/host1x/hw/intr_hw.c b/drivers/gpu/host1x/hw/intr_hw.c
index f56375ee6e71833416fd90ec394929adc70efa5f..9acccdb139e6e9b9c84dddca231a0c517a912a03 100644 (file)
--- a/drivers/gpu/host1x/hw/intr_hw.c
+++ b/drivers/gpu/host1x/hw/intr_hw.c
@@ -76,6 +76,17 @@ static void intr_hw_init(struct host1x *host, u32 cpm)
        /* update host clocks per usec */
        host1x_sync_writel(host, cpm, HOST1X_SYNC_USEC_CLK);
 #endif
+#if HOST1X_HW >= 8
+       u32 id;
+
+       /*
+        * Program threshold interrupt destination among 8 lines per VM,
+        * per syncpoint. For now, just direct all to the first interrupt
+        * line.
+        */
+       for (id = 0; id < host->info->nb_pts; id++)
+               host1x_sync_writel(host, 0, HOST1X_SYNC_SYNCPT_INTR_DEST(id));
+#endif
 }
 
 static int