drm/radeon: add helper function to support golden registers
Golden registers are arrays of register settings from the
hw team that need to be initialized at asic startup.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 856a67d..d6c8cba 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -1946,6 +1946,9 @@
extern int radeon_resume_kms(struct drm_device *dev);
extern int radeon_suspend_kms(struct drm_device *dev, pm_message_t state);
extern void radeon_ttm_set_active_vram_size(struct radeon_device *rdev, u64 size);
+extern void radeon_program_register_sequence(struct radeon_device *rdev,
+ const u32 *registers,
+ const u32 array_size);
/*
* vm
diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
index 62d0ba3..237b7a7 100644
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c
@@ -98,6 +98,42 @@
};
/**
+ * radeon_program_register_sequence - program an array of registers.
+ *
+ * @rdev: radeon_device pointer
+ * @registers: pointer to the register array
+ * @array_size: size of the register array
+ *
+ * Programs an array or registers with and and or masks.
+ * This is a helper for setting golden registers.
+ */
+void radeon_program_register_sequence(struct radeon_device *rdev,
+ const u32 *registers,
+ const u32 array_size)
+{
+ u32 tmp, reg, and_mask, or_mask;
+ int i;
+
+ if (array_size % 3)
+ return;
+
+ for (i = 0; i < array_size; i +=3) {
+ reg = registers[i + 0];
+ and_mask = registers[i + 1];
+ or_mask = registers[i + 2];
+
+ if (and_mask == 0xffffffff) {
+ tmp = or_mask;
+ } else {
+ tmp = RREG32(reg);
+ tmp &= ~and_mask;
+ tmp |= or_mask;
+ }
+ WREG32(reg, tmp);
+ }
+}
+
+/**
* radeon_surface_init - Clear GPU surface registers.
*
* @rdev: radeon_device pointer