From: Javier Viguera <javier.viguera@digi.com>
Date: Tue, 10 Nov 2015 17:45:37 +0100
Subject: [PATCH] mxc: gpu: use recommended values for minimum GPU frequency
 divisor

Freescale recommends the following default minimum GPU frequency divisors
depending on the CPU family:
    - 3 for Dual/Quad
    - 8 for DualLite/Solo

Adapted for the external Vivante GPU driver from commit a790ad3 in linux
git repository.

Signed-off-by: Javier Viguera <javier.viguera@digi.com>
---
 .../src/hal/os/linux/kernel/gc_hal_kernel_driver.c             | 14 +++++++++++++-
 .../src/platform/freescale/gc_hal_kernel_platform_imx6.c       |  2 +-
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/src/hal/os/linux/kernel/gc_hal_kernel_driver.c b/src/hal/os/linux/kernel/gc_hal_kernel_driver.c
index 816aae0..15a8753 100644
--- a/src/hal/os/linux/kernel/gc_hal_kernel_driver.c
+++ b/src/hal/os/linux/kernel/gc_hal_kernel_driver.c
@@ -54,6 +54,7 @@
 
 
 #include <linux/device.h>
+#include <linux/of.h>
 #include <linux/slab.h>
 #include <linux/miscdevice.h>
 
@@ -199,7 +200,7 @@ static uint type = 0;
 module_param(type, uint, 0664);
 MODULE_PARM_DESC(type, "0 - Char Driver (Default), 1 - Misc Driver");
 
-static int gpu3DMinClock = 1;
+static int gpu3DMinClock = 0;
 
 static int contiguousRequested = 0;
 
@@ -959,6 +960,17 @@ static int __devinit gpu_probe(struct platform_device *pdev)
         _UpdateModuleParam(&moduleParam);
     }
 
+    /* If undefined, set Freescale recommended value. Else use the min freq. */
+    if (gpu3DMinClock == 0) {
+        if (of_machine_is_compatible("fsl,imx6dl"))
+            gpu3DMinClock = 8;
+        else if (of_machine_is_compatible("fsl,imx6q") ||
+                 of_machine_is_compatible("fsl,imx6qp"))
+            gpu3DMinClock = 3;
+        else
+            gpu3DMinClock = 1;
+    }
+
     ret = drv_init();
 
     if (!ret)
diff --git a/src/hal/os/linux/kernel/platform/freescale/gc_hal_kernel_platform_imx6.c b/src/hal/os/linux/kernel/platform/freescale/gc_hal_kernel_platform_imx6.c
index 89706ec..65a54e2 100644
--- a/src/hal/os/linux/kernel/platform/freescale/gc_hal_kernel_platform_imx6.c
+++ b/src/hal/os/linux/kernel/platform/freescale/gc_hal_kernel_platform_imx6.c
@@ -123,7 +123,7 @@ extern int unregister_thermal_notifier(struct notifier_block *nb);
 #define gcdFSL_CONTIGUOUS_SIZE (4 << 20)
 #endif
 
-static int initgpu3DMinClock = 1;
+static int initgpu3DMinClock = 0;
 module_param(initgpu3DMinClock, int, 0644);
 
 struct platform_device *pdevice;