drm/amd/amdgpu: fix 64-bit division

[mirror_ubuntu-artful-kernel.git] / drivers / gpu / drm / amd / powerplay / hwmgr / polaris10_hwmgr.c

diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.c b/drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.c
index 715bc3d569242094b3d713d044a8b718d9cb861a..a5172d154da51319e765f693f71e5bc4c893fea0 100644 (file)
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/polaris10_hwmgr.c
@@ -23,6 +23,7 @@
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/fb.h>
+#include <asm/div64.h>
 #include "linux/delay.h"
 #include "pp_acpi.h"
 #include "hwmgr.h"
@@ -981,7 +982,8 @@ static int polaris10_calculate_sclk_params(struct pp_hwmgr *hwmgr,
        sclk_setting->Fcw_int = (uint16_t)((clock << table->SclkFcwRangeTable[sclk_setting->PllRange].postdiv) / ref_clock);
        temp = clock << table->SclkFcwRangeTable[sclk_setting->PllRange].postdiv;
        temp <<= 0x10;
-       sclk_setting->Fcw_frac = (uint16_t)(0xFFFF & (temp / ref_clock));
+       do_div(temp, ref_clock);
+       sclk_setting->Fcw_frac = temp & 0xffff;
 
        pcc_target_percent = 10; /*  Hardcode 10% for now. */
        pcc_target_freq = clock - (clock * pcc_target_percent / 100);
@@ -995,7 +997,8 @@ static int polaris10_calculate_sclk_params(struct pp_hwmgr *hwmgr,
                sclk_setting->Fcw1_int = (uint16_t)((ss_target_freq << table->SclkFcwRangeTable[sclk_setting->PllRange].postdiv) / ref_clock);
                temp = ss_target_freq << table->SclkFcwRangeTable[sclk_setting->PllRange].postdiv;
                temp <<= 0x10;
-               sclk_setting->Fcw1_frac = (uint16_t)(0xFFFF & (temp / ref_clock));
+               do_div(temp, ref_clock);
+               sclk_setting->Fcw1_frac = temp & 0xffff;
        }
 
        return 0;