drm/panfrost: Add support for multiple power domains
When there is a single power domain per device, the core will
ensure the power domain is switched on (so it is technically
equivalent to having not power domain specified at all).
However, when there are multiple domains, as in MT8183 Bifrost
GPU, we need to handle them in driver code.
Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200207052627.130118-6-drinkcat@chromium.org
diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
index c9468bc..c30c719 100644
--- a/drivers/gpu/drm/panfrost/panfrost_device.h
+++ b/drivers/gpu/drm/panfrost/panfrost_device.h
@@ -21,6 +21,7 @@ struct panfrost_perfcnt;
#define NUM_JOB_SLOTS 3
#define MAX_REGULATORS 2
+#define MAX_PM_DOMAINS 3
struct panfrost_features {
u16 id;
@@ -61,6 +62,13 @@ struct panfrost_compatible {
/* Supplies count and names. */
int num_supplies;
const char * const *supply_names;
+ /*
+ * Number of power domains required, note that values 0 and 1 are
+ * handled identically, as only values > 1 need special handling.
+ */
+ int num_pm_domains;
+ /* Only required if num_pm_domains > 1. */
+ const char * const *pm_domain_names;
};
struct panfrost_device {
@@ -73,6 +81,9 @@ struct panfrost_device {
struct clk *bus_clock;
struct regulator_bulk_data regulators[MAX_REGULATORS];
struct reset_control *rstc;
+ /* pm_domains for devices with more than one. */
+ struct device *pm_domain_devs[MAX_PM_DOMAINS];
+ struct device_link *pm_domain_links[MAX_PM_DOMAINS];
struct panfrost_features features;
const struct panfrost_compatible *comp;