From eed02a7b53131abb796ba8a8cf2886cee366a89f Mon Sep 17 00:00:00 2001 From: "Kumar, Mahesh" Date: Wed, 5 Jul 2017 20:01:45 +0530 Subject: [PATCH] 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 Reviewed-by: Maarten Lankhorst Signed-off-by: Maarten Lankhorst Link: http://patchwork.freedesktop.org/patch/msgid/20170705143154.32132-3-mahesh1.kumar@intel.com [mlankhorst: Fix typo in commit message.] --- drivers/gpu/drm/i915/i915_drv.h | 9 --------- drivers/gpu/drm/i915/intel_pm.c | 4 ++-- 2 files changed, 2 insertions(+), 11 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 @@ -196,15 +196,6 @@ 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; diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 6db833e6dcbd..05eabadaa23d 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -4276,7 +4276,7 @@ static uint_fixed_16_16_t skl_wm_method1(uint32_t pixel_rate, uint8_t cpp, return FP_16_16_MAX; wm_intermediate_val = latency * pixel_rate * cpp; - ret = fixed_16_16_div_u64(wm_intermediate_val, 1000 * 512); + ret = fixed_16_16_div(wm_intermediate_val, 1000 * 512); return ret; } @@ -4314,7 +4314,7 @@ intel_get_linetime_us(struct intel_crtc_state *cstate) return u32_to_fixed_16_16(0); crtc_htotal = cstate->base.adjusted_mode.crtc_htotal; - linetime_us = fixed_16_16_div_u64(crtc_htotal * 1000, pixel_rate); + linetime_us = fixed_16_16_div(crtc_htotal * 1000, pixel_rate); return linetime_us; } -- 2.30.2