ARM: tegra: Special-case the 3D clamps on Tegra124

A separate register is used to remove the clamps for the GPU on
Tegra124. In order to be able to use the same API, special-case
this particular partition.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Stephen Warren <swarren@nvidia.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/arch/arm/mach-tegra/powergate.c b/arch/arm/mach-tegra/powergate.c
index a8ac634eda77..0026fb6c984b 100644
--- a/arch/arm/mach-tegra/powergate.c
+++ b/arch/arm/mach-tegra/powergate.c
@@ -41,6 +41,8 @@
 
 #define PWRGATE_STATUS          0x38
 
+#define GPU_RG_CNTRL            0x2d4
+
 static int tegra_num_powerdomains;
 static int tegra_num_cpu_domains;
 static const u8 *tegra_cpu_domains;
@@ -137,6 +139,17 @@ int tegra_powergate_remove_clamping(int id)
                 return -EINVAL;
 
         /*
+         * The Tegra124 GPU has a separate register (with different semantics)
+         * to remove clamps.
+         */
+        if (tegra_chip_id == TEGRA124) {
+                if (id == TEGRA_POWERGATE_3D) {
+                        pmc_write(0, GPU_RG_CNTRL);
+                        return 0;
+                }
+        }
+
+        /*
          * Tegra 2 has a bug where PCIE and VDE clamping masks are
          * swapped relatively to the partition ids
          */