The Tegra124 and later Tegra SoCs have a sepatate rail gating register
to enable/disable the clamp. The original function
tegra_powergate_remove_clamping() is not sufficient for the enable
function. So add a new function which is dedicated to the GPU rail
gating. Also don't refer to the powergate ID since the GPU ID makes no
sense here.
Signed-off-by: Vince Hsu <vinceh@xxxxxxxxxx>
---
drivers/soc/tegra/pmc.c | 34 +++++++++++++++++++++++-----------
include/soc/tegra/pmc.h | 2 ++
2 files changed, 25 insertions(+), 11 deletions(-)
diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
index a2c0ceb95f8f..7798c530ead1 100644
--- a/drivers/soc/tegra/pmc.c
+++ b/drivers/soc/tegra/pmc.c
@@ -225,17 +225,6 @@ int tegra_powergate_remove_clamping(int id)
return -EINVAL;
/*
- * The Tegra124 GPU has a separate register (with different semantics)
- * to remove clamps.
- */
- if (tegra_get_chip_id() == TEGRA124) {
- if (id == TEGRA_POWERGATE_3D) {
- tegra_pmc_writel(0, GPU_RG_CNTRL);
- return 0;
- }
- }
-
- /*
* Tegra 2 has a bug where PCIE and VDE clamping masks are
* swapped relatively to the partition ids
*/
@@ -253,6 +242,29 @@ int tegra_powergate_remove_clamping(int id)
EXPORT_SYMBOL(tegra_powergate_remove_clamping);
/**
+ * tegra_powergate_gpu_set_clamping - control GPU-SOC clamps
+ *
+ * The post-Tegra114 chips have a separate rail gating register to configure
+ * clamps.
+ *
+ * @assert: true to assert clamp, and false to remove
+ */
+int tegra_powergate_gpu_set_clamping(bool assert)
+{
+ if (!pmc->soc)
+ return -EINVAL;
+
+ if (tegra_get_chip_id() == TEGRA124) {
+ tegra_pmc_writel(assert ? 1 : 0, GPU_RG_CNTRL);
+ tegra_pmc_readl(GPU_RG_CNTRL);
+ return 0;
+ }
+
+ return -EINVAL;
+}
+EXPORT_SYMBOL(tegra_powergate_gpu_set_clamping);
+
+/**
* tegra_powergate_sequence_power_up() - power up partition
* @id: partition ID
* @clk: clock for partition
diff --git a/include/soc/tegra/pmc.h b/include/soc/tegra/pmc.h
index 65a93273e72f..53d620525a9e 100644
--- a/include/soc/tegra/pmc.h
+++ b/include/soc/tegra/pmc.h
@@ -109,6 +109,8 @@ int tegra_powergate_is_powered(int id);
int tegra_powergate_power_on(int id);
int tegra_powergate_power_off(int id);
int tegra_powergate_remove_clamping(int id);
+/* Only for Tegra124 and later */
+int tegra_powergate_gpu_set_clamping(bool assert);
/* Must be called with clk disabled, and returns with clk enabled */
int tegra_powergate_sequence_power_up(int id, struct clk *clk,
--
1.9.1
--
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