From: Taniya Das <tdas@xxxxxxxxxxxxxx>
Most of the time the CPU should not be touching the GX domain on the
GPU
except for a very special use case when the CPU needs to force the GX
headswitch off. Add a dummy enable function for the GX gdsc to simulate
success so that the pm_runtime reference counting is correct.
Signed-off-by: Taniya Das <tdas@xxxxxxxxxxxxxx>
---
drivers/clk/qcom/gpucc-sc7180.c | 37 +++++++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
diff --git a/drivers/clk/qcom/gpucc-sc7180.c b/drivers/clk/qcom/gpucc-sc7180.c
index ec61194..3b29f19 100644
--- a/drivers/clk/qcom/gpucc-sc7180.c
+++ b/drivers/clk/qcom/gpucc-sc7180.c
@@ -172,8 +172,45 @@ enum {
.flags = VOTABLE,
};
+/*
+ * On SC7180 the GPU GX domain is *almost* entirely controlled by the GMU
+ * running in the CX domain so the CPU doesn't need to know anything about the
+ * GX domain EXCEPT....
+ *
+ * Hardware constraints dictate that the GX be powered down before the CX. If
+ * the GMU crashes it could leave the GX on. In order to successfully bring back
+ * the device the CPU needs to disable the GX headswitch. There being no sane
+ * way to reach in and touch that register from deep inside the GPU driver we
+ * need to set up the infrastructure to be able to ensure that the GPU can
+ * ensure that the GX is off during this super special case. We do this by
+ * defining a GX gdsc with a dummy enable function and a "default" disable
+ * function.
+ *
+ * This allows us to attach with genpd_dev_pm_attach_by_name() in the GPU
+ * driver. During power up, nothing will happen from the CPU (and the GMU will
+ * power up normally but during power down this will ensure that the GX domain
+ * is *really* off - this gives us a semi standard way of doing what we need.
+ */
+static int gx_gdsc_enable(struct generic_pm_domain *domain)
+{
+ /* Do nothing but give genpd the impression that we were successful */
+ return 0;
+}
+
+static struct gdsc gx_gdsc = {
+ .gdscr = 0x100c,
+ .clamp_io_ctrl = 0x1508,
+ .pd = {
+ .name = "gpu_gx_gdsc",
+ .power_on = gx_gdsc_enable,
+ },
+ .pwrsts = PWRSTS_OFF_ON,
+ .flags = CLAMP_IO,
+};
+
static struct gdsc *gpu_cc_sc7180_gdscs[] = {
[CX_GDSC] = &cx_gdsc,
+ [GX_GDSC] = &gx_gdsc,
};
static struct clk_regmap *gpu_cc_sc7180_clocks[] = {
--
1.9.1
