1 files changed, 14 insertions, 8 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a_sysfs.c b/drivers/gpu/nvgpu/gk20a/gk20a_sysfs.c
index 945b332d..2d803d0e 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a_sysfs.c
+++ b/drivers/gpu/nvgpu/gk20a/gk20a_sysfs.c
@@ -23,7 +23,6 @@
 #include <linux/kernel.h>
 #include <linux/fb.h>
 #include <linux/gk20a.h>
-
 #include <mach/clk.h>
 
 #include "gk20a.h"
@@ -33,9 +32,6 @@
 
 
 #define PTIMER_FP_FACTOR                        1000000
-/* PTIMER_REF_FREQ_HZ corresponds to a period of 32 nanoseconds. 32 ns is
-   the resolution of ptimer. */
-#define PTIMER_REF_FREQ_HZ                      31250000
 
 #define ROOTRW (S_IRWXU|S_IRGRP|S_IROTH)
 
@@ -208,17 +204,27 @@ static ssize_t ptimer_scale_factor_show(struct device *dev,
                                                 struct device_attribute *attr,
                                                 char *buf)
 {
-        u32 tsc_freq_hz = clk_get_rate(clk_get_sys(NULL, "clk_m"));
-        u32 scaling_factor_fp = (u32)(PTIMER_REF_FREQ_HZ) /
-                                ((u32)(tsc_freq_hz) /
+        struct gk20a_platform *platform = dev_get_drvdata(dev);
+        u32 src_freq_hz = platform->ptimer_src_freq;
+        u32 scaling_factor_fp;
+        ssize_t res;
+
+        if (!src_freq_hz) {
+                dev_err(dev, "reference clk_m rate is not set correctly\n");
+                return -EINVAL;
+        }
+
+        scaling_factor_fp = (u32)(PTIMER_REF_FREQ_HZ) /
+                                ((u32)(src_freq_hz) /
                                 (u32)(PTIMER_FP_FACTOR));
-        ssize_t res = snprintf(buf,
+        res = snprintf(buf,
                                 PAGE_SIZE,
                                 "%u.%u\n",
                                 scaling_factor_fp / PTIMER_FP_FACTOR,
                                 scaling_factor_fp % PTIMER_FP_FACTOR);
 
         return res;
+
 }
 
 static DEVICE_ATTR(ptimer_scale_factor,