[U-Boot] [PATCH] clk: clk_stm32f7: fix PLL clock division factor

From: Patrice Chotard patrice.chotard@st.com

Fix clock division factor initialization for RCC_PLLCFGR registers.

PLLR bits (bit 31-28) in RCC_PLLCFGR must not be cleared, it's a forbidden value. So update RCC_PLLCFGR using clrsetbits_le32() to set only necessary bits fields.

Signed-off-by: Patrice Chotard patrice.chotard@st.com --- drivers/clk/clk_stm32f7.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/clk/clk_stm32f7.c b/drivers/clk/clk_stm32f7.c index 96a06b8..4b0e449 100644 --- a/drivers/clk/clk_stm32f7.c +++ b/drivers/clk/clk_stm32f7.c @@ -135,13 +135,15 @@ static int configure_clocks(struct udevice *dev) | (sys_pll_psc.apb2_psc << RCC_CFGR_PPRE2_SHIFT)));

/* Configure the main PLL */ - uint32_t pllcfgr = 0; - pllcfgr = RCC_PLLCFGR_PLLSRC; /* pll source HSE */ - pllcfgr |= sys_pll_psc.pll_m << RCC_PLLCFGR_PLLM_SHIFT; - pllcfgr |= sys_pll_psc.pll_n << RCC_PLLCFGR_PLLN_SHIFT; - pllcfgr |= ((sys_pll_psc.pll_p >> 1) - 1) << RCC_PLLCFGR_PLLP_SHIFT; - pllcfgr |= sys_pll_psc.pll_q << RCC_PLLCFGR_PLLQ_SHIFT; - writel(pllcfgr, &regs->pllcfgr); + setbits_le32(&regs->pllcfgr, RCC_PLLCFGR_PLLSRC); /* pll source HSE */ + clrsetbits_le32(&regs->pllcfgr, RCC_PLLCFGR_PLLM_MASK, + sys_pll_psc.pll_m << RCC_PLLCFGR_PLLM_SHIFT); + clrsetbits_le32(&regs->pllcfgr, RCC_PLLCFGR_PLLN_MASK, + sys_pll_psc.pll_n << RCC_PLLCFGR_PLLN_SHIFT); + clrsetbits_le32(&regs->pllcfgr, RCC_PLLCFGR_PLLP_MASK, + ((sys_pll_psc.pll_p >> 1) - 1) << RCC_PLLCFGR_PLLP_SHIFT); + clrsetbits_le32(&regs->pllcfgr, RCC_PLLCFGR_PLLQ_MASK, + sys_pll_psc.pll_q << RCC_PLLCFGR_PLLQ_SHIFT);

/* Enable the main PLL */ setbits_le32(&regs->cr, RCC_CR_PLLON);