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drm: powerplay: use div64_s64 instead of do_div 

The newly added code for Fiji creates a correct compiler warning
about invalid use of the do_div macro:

In file included from powerplay/hwmgr/ppatomctrl.c:31:0:
drivers/gpu/drm/amd/amdgpu/../powerplay/hwmgr/ppevvmath.h: In function 'fDivide':
drivers/gpu/drm/amd/amdgpu/../powerplay/hwmgr/ppevvmath.h:382:89: warning: comparison of distinct pointer types lacks a cast
     do_div(longlongX, longlongY); /*Q(32,32) divided by Q(16,16) = Q(16,16) Back to original format */

do_div() divides an unsigned 64-bit number by an unsigned 32-bit number.
The code instead wants to divide two signed 64-bit numbers, which is done
using the div64_s64 function.

Reviewed-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 770911a3cf ("drm/amd/powerplay: add/update headers for Fiji SMU and DPM")
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Arnd Bergmann 2016-01-01 14:07:41 +01:00 committed by Alex Deucher
parent c11b898963
commit 6a53b31349
1 changed files with 1 additions and 1 deletions
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drivers/gpu/drm/amd/powerplay/hwmgr/ppevvmath.h
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@ -379,7 +379,7 @@ fInt fDivide (fInt X, fInt Y)
longlongX = longlongX << 16; /*Q(16,16) -> Q(32,32) */
do_div(longlongX, longlongY); /*Q(32,32) divided by Q(16,16) = Q(16,16) Back to original format */
div64_s64(longlongX, longlongY); /*Q(32,32) divided by Q(16,16) = Q(16,16) Back to original format */
fQuotient.full = (int)longlongX;
return fQuotient;