Thread (5 messages) 5 messages, 3 authors, 2023-02-18
STALE1244d LANDED

[PATCH] clk: imx: pll14xx: fix recalc_rate for negative kdiv

From: Kevin Groeneveld <hidden>
Date: 2022-12-10 20:39:31
Also in: linux-clk, lkml
Subsystem: common clk framework, nxp i.mx clock drivers, the rest · Maintainers: Michael Turquette, Stephen Boyd, Abel Vesa, Linus Torvalds

kdiv is a signed 16 bit value in the DEV_CTL1 register. Commit
53990cf9d5b4 ("clk: imx: pll14xx: consolidate rate calculation") changed
the kdiv variable from a short int to just int. When the value read from
the DIV_CTL1 register is assigned directly to an int the sign of the value
is lost resulting in incorrect results when the value is negative. Adding
a s16 cast to the register value fixes the issue.

Fixes: 53990cf9d5b4 ("clk: imx: pll14xx: consolidate rate calculation")
Signed-off-by: Kevin Groeneveld <redacted>
---
 drivers/clk/imx/clk-pll14xx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/clk/imx/clk-pll14xx.c b/drivers/clk/imx/clk-pll14xx.c
index 1d0f79e9c346..d12194d17b10 100644
--- a/drivers/clk/imx/clk-pll14xx.c
+++ b/drivers/clk/imx/clk-pll14xx.c
@@ -254,7 +254,7 @@ static unsigned long clk_pll14xx_recalc_rate(struct clk_hw *hw,
 
 	if (pll->type == PLL_1443X) {
 		pll_div_ctl1 = readl_relaxed(pll->base + DIV_CTL1);
-		kdiv = FIELD_GET(KDIV_MASK, pll_div_ctl1);
+		kdiv = (s16)FIELD_GET(KDIV_MASK, pll_div_ctl1);
 	} else {
 		kdiv = 0;
 	}
-- 
2.17.1


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