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drm/radeon/dpm: fix si_calculate_memory_refresh_rate() 

Update alogorithm as per internal advice.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2013-07-26 18:18:32 -04:00
parent 489bc476b4
commit f44a0120ef
1 changed files with 3 additions and 6 deletions
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9
drivers/gpu/drm/radeon/si_dpm.c
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@ -37,8 +37,6 @@
#define SMC_RAM_END 0x20000
#define DDR3_DRAM_ROWS 0x2000
#define SCLK_MIN_DEEPSLEEP_FREQ 1350
static const struct si_cac_config_reg cac_weights_tahiti[] =
@ -4040,16 +4038,15 @@ static int si_force_switch_to_arb_f0(struct radeon_device *rdev)
static u32 si_calculate_memory_refresh_rate(struct radeon_device *rdev,
u32 engine_clock)
{
struct rv7xx_power_info *pi = rv770_get_pi(rdev);
u32 dram_rows;
u32 dram_refresh_rate;
u32 mc_arb_rfsh_rate;
u32 tmp = (RREG32(MC_ARB_RAMCFG) & NOOFROWS_MASK) >> NOOFROWS_SHIFT;
if (pi->mem_gddr5)
dram_rows = 1 << (tmp + 10);
if (tmp >= 4)
dram_rows = 16384;
else
dram_rows = DDR3_DRAM_ROWS;
dram_rows = 1 << (tmp + 10);
dram_refresh_rate = 1 << ((RREG32(MC_SEQ_MISC0) & 0x3) + 3);
mc_arb_rfsh_rate = ((engine_clock * 10) * dram_refresh_rate / dram_rows - 32) / 64;