drm/msm/adreno: Read the speed bins for a5xx targets

Some 5xx based chipsets have different bins for GPU clock speeds.
Read the fuses (if applicable) and set the appropriate OPP table.
This will only work with OPP v2 tables - the bin will be ignored
for legacy pwrlevel tables.
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>

drivers/gpu/drm/msm/adreno/a5xx_gpu.c

@@ -17,6 +17,8 @@
 #include <linux/dma-mapping.h>
 #include <linux/of_address.h>
 #include <linux/soc/qcom/mdt_loader.h>
+#include <linux/pm_opp.h>
+#include <linux/nvmem-consumer.h>
 #include "msm_gem.h"
 #include "msm_mmu.h"
 #include "a5xx_gpu.h"
@@ -1184,6 +1186,25 @@ static const struct adreno_gpu_funcs funcs = {
 	.get_timestamp = a5xx_get_timestamp,
 };
 
+static void check_speed_bin(struct device *dev)
+{
+	struct nvmem_cell *cell;
+	u32 bin, val;
+
+	cell = nvmem_cell_get(dev, "speed_bin");
+
+	/* If a nvmem cell isn't defined, nothing to do */
+	if (IS_ERR(cell))
+		return;
+
+	bin = *((u32 *) nvmem_cell_read(cell, NULL));
+	nvmem_cell_put(cell);
+
+	val = (1 << bin);
+
+	dev_pm_opp_set_supported_hw(dev, &val, 1);
+}
+
 struct msm_gpu *a5xx_gpu_init(struct drm_device *dev)
 {
 	struct msm_drm_private *priv = dev->dev_private;
@@ -1210,6 +1231,8 @@ struct msm_gpu *a5xx_gpu_init(struct drm_device *dev)
 
 	a5xx_gpu->lm_leakage = 0x4E001A;
 
+	check_speed_bin(&pdev->dev);
+
 	ret = adreno_gpu_init(dev, pdev, adreno_gpu, &funcs, 4);
 	if (ret) {
 		a5xx_destroy(&(a5xx_gpu->base.base));