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| author | Kumar, Mahesh <mahesh1.kumar@intel.com> | 2017-07-05 20:01:45 +0530 |
|---|---|---|
| committer | Maarten Lankhorst <maarten.lankhorst@linux.intel.com> | 2017-07-13 16:37:20 +0200 |
| commit | eed02a7b53131abb796ba8a8cf2886cee366a89f (patch) | |
| tree | 9b6c017f2f0073eb485e0df7e1471853d0bc3bc0 /drivers/gpu/drm/i915/i915_drv.h | |
| parent | 07ab976d1971a91a7ac25d4782dc8985a2314b87 (diff) | |
drm/i915: Always perform internal fixed16 division in 64 bits
This patch combines fixed_16_16_div & fixed_16_16_div_u64 wrappers.
And new fixed_16_16_div wrapper always performs division operation in
u64 internally, to avoid any data loss which was happening in earlier
version of wrapper.
earlier wrapper was converting u32 to fixed16 in 32 bit so we were
losing 16-MSB data.
Signed-off-by: Mahesh Kumar <mahesh1.kumar@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170705143154.32132-3-mahesh1.kumar@intel.com
[mlankhorst: Fix typo in commit message.]
Diffstat (limited to 'drivers/gpu/drm/i915/i915_drv.h')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_drv.h | 9 |
1 files changed, 0 insertions, 9 deletions
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 1b525051bf5f..95d5328a26e9 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -197,15 +197,6 @@ static inline uint_fixed_16_16_t mul_fixed16(uint_fixed_16_16_t val, static inline uint_fixed_16_16_t fixed_16_16_div(uint32_t val, uint32_t d) { - uint_fixed_16_16_t fp, res; - - fp = u32_to_fixed_16_16(val); - res.val = DIV_ROUND_UP(fp.val, d); - return res; -} - -static inline uint_fixed_16_16_t fixed_16_16_div_u64(uint32_t val, uint32_t d) -{ uint64_t interm_val; interm_val = (uint64_t)val << 16; |