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drm/msm/dsi: Use division result from div_u64_rem in 7nm and 14nm PLL 

div_u64_rem provides the result of the division and additionally the
remainder; don't use this function to solely calculate the remainder
while calculating the division again with div_u64.

A similar improvement was applied earlier to the 10nm pll in
5c191fef4c ("drm/msm/dsi_pll_10nm: Fix dividing the same numbers
twice").

Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org>
Reviewed-By: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
Reviewed-by: Abhinav Kumar <abhinavk@codeaurora.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/20211011201642.167700-1-marijn.suijten@somainline.org
Signed-off-by: Rob Clark <robdclark@chromium.org>
This commit is contained in:
Marijn Suijten 2021-10-11 22:16:40 +02:00 committed by Rob Clark
parent 5369f3c509
commit a377da4b0e
2 changed files with 2 additions and 6 deletions
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4
drivers/gpu/drm/msm/dsi/phy/dsi_phy_14nm.c
View File

@ -213,9 +213,7 @@ static void pll_14nm_dec_frac_calc(struct dsi_pll_14nm *pll, struct dsi_pll_conf
DBG("vco_clk_rate=%lld ref_clk_rate=%lld", vco_clk_rate, fref);
dec_start_multiple = div_u64(vco_clk_rate * multiplier, fref);
div_u64_rem(dec_start_multiple, multiplier, &div_frac_start);
dec_start = div_u64(dec_start_multiple, multiplier);
dec_start = div_u64_rem(dec_start_multiple, multiplier, &div_frac_start);
pconf->dec_start = (u32)dec_start;
pconf->div_frac_start = div_frac_start;

4
drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
View File

@ -114,9 +114,7 @@ static void dsi_pll_calc_dec_frac(struct dsi_pll_7nm *pll, struct dsi_pll_config
multiplier = 1 << FRAC_BITS;
dec_multiple = div_u64(pll_freq * multiplier, divider);
div_u64_rem(dec_multiple, multiplier, &frac);
dec = div_u64(dec_multiple, multiplier);
dec = div_u64_rem(dec_multiple, multiplier, &frac);
if (!(pll->phy->cfg->quirks & DSI_PHY_7NM_QUIRK_V4_1))
config->pll_clock_inverters = 0x28;