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clk: stm32mp1: recalculate counter when switching freq

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Because stgen is initialized with HSI clock, we need to
recalculate the counter when changing frequency.

Signed-off-by: Lionel Debieve <lionel.debieve@st.com>
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
This commit is contained in:
Patrick Delaunay 2019-01-30 13:07:03 +01:00 committed by Tom Rini
parent 63201281e5
commit f3a23c2609
1 changed files with 7 additions and 2 deletions
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9
drivers/clk/clk_stm32mp1.c
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@ -1469,10 +1469,15 @@ static void stgen_config(struct stm32mp1_clk_priv *priv)
rate = stm32mp1_clk_get(priv, p);
if (cntfid0 != rate) {
u64 counter;
pr_debug("System Generic Counter (STGEN) update\n");
clrbits_le32(stgenc + STGENC_CNTCR, STGENC_CNTCR_EN);
writel(0x0, stgenc + STGENC_CNTCVL);
writel(0x0, stgenc + STGENC_CNTCVU);
counter = (u64)readl(stgenc + STGENC_CNTCVL);
counter |= ((u64)(readl(stgenc + STGENC_CNTCVU))) << 32;
counter = lldiv(counter * (u64)rate, cntfid0);
writel((u32)counter, stgenc + STGENC_CNTCVL);
writel((u32)(counter >> 32), stgenc + STGENC_CNTCVU);
writel(rate, stgenc + STGENC_CNTFID0);
setbits_le32(stgenc + STGENC_CNTCR, STGENC_CNTCR_EN);