From: Ludwig Kormann Date: Thu, 1 Feb 2024 08:45:50 +0000 (+0100) Subject: sunxi: sun4i: add missing sdelay() to clock_init_safe() X-Git-Url: http://git.dujemihanovic.xyz/html/static/%7B%7B%20.Permalink%20%7D%7D?a=commitdiff_plain;h=3b08e66f69f3bb8a14f771483d3718f67e22709f;p=u-boot.git sunxi: sun4i: add missing sdelay() to clock_init_safe() This delay is required after switching the clock source. See “A20 Reference manual v1.4” Page 50 / section “1.5.4.16. CPU/AHB/APB0 CLOCK RATIO”: “If the clock source is changed, at most to wait for 8 present running clock cycles.” This is already implemented in clock_set_pll1(), but was still missing in clock_init_safe(). Signed-off-by: Ludwig Kormann Reviewed-by: Andre Przywara --- diff --git a/arch/arm/mach-sunxi/clock_sun4i.c b/arch/arm/mach-sunxi/clock_sun4i.c index 8f1d1b65f0..ac3b7a801f 100644 --- a/arch/arm/mach-sunxi/clock_sun4i.c +++ b/arch/arm/mach-sunxi/clock_sun4i.c @@ -25,6 +25,7 @@ void clock_init_safe(void) APB0_DIV_1 << APB0_DIV_SHIFT | CPU_CLK_SRC_OSC24M << CPU_CLK_SRC_SHIFT, &ccm->cpu_ahb_apb0_cfg); + sdelay(20); writel(PLL1_CFG_DEFAULT, &ccm->pll1_cfg); sdelay(200); writel(AXI_DIV_1 << AXI_DIV_SHIFT | @@ -32,6 +33,7 @@ void clock_init_safe(void) APB0_DIV_1 << APB0_DIV_SHIFT | CPU_CLK_SRC_PLL1 << CPU_CLK_SRC_SHIFT, &ccm->cpu_ahb_apb0_cfg); + sdelay(20); #ifdef CONFIG_MACH_SUN7I setbits_le32(&ccm->ahb_gate0, 0x1 << AHB_GATE_OFFSET_DMA); #endif