Commit 5c2f117a authored by Emil Lundmark's avatar Emil Lundmark Committed by Stephen Boyd

clk: imx: fix integer overflow in AV PLL round rate

Since 'parent_rate * mfn' may overflow 32 bits, the result should be
stored using 64 bits.

The problem was discovered when trying to set the rate of the audio PLL
(pll4_post_div) on an i.MX6Q. The desired rate was 196.608 MHz, but
the actual rate returned was 192.000570 MHz. The round rate function should
have been able to return 196.608 MHz, i.e., the desired rate.

Fixes: ba7f4f55 ("clk: imx: correct AV PLL rate formula")
Cc: Anson Huang <b20788@freescale.com>
Signed-off-by: default avatarEmil Lundmark <emil@limesaudio.com>
Reviewed-by: default avatarFabio Estevam <fabio.estevam@nxp.com>
Acked-by: default avatarShawn Guo <shawnguo@kernel.org>
Signed-off-by: default avatarStephen Boyd <sboyd@codeaurora.org>
parent 06b113e9
......@@ -223,7 +223,7 @@ static unsigned long clk_pllv3_av_recalc_rate(struct clk_hw *hw,
temp64 *= mfn;
do_div(temp64, mfd);
return (parent_rate * div) + (u32)temp64;
return parent_rate * div + (unsigned long)temp64;
}
static long clk_pllv3_av_round_rate(struct clk_hw *hw, unsigned long rate,
......@@ -247,7 +247,11 @@ static long clk_pllv3_av_round_rate(struct clk_hw *hw, unsigned long rate,
do_div(temp64, parent_rate);
mfn = temp64;
return parent_rate * div + parent_rate * mfn / mfd;
temp64 = (u64)parent_rate;
temp64 *= mfn;
do_div(temp64, mfd);
return parent_rate * div + (unsigned long)temp64;
}
static int clk_pllv3_av_set_rate(struct clk_hw *hw, unsigned long rate,
......
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