From c69def88987995f5d3ea28f12febd1b2c567f511 Mon Sep 17 00:00:00 2001 From: Peng Fan Date: Wed, 19 Feb 2020 18:17:08 +0800 Subject: clk: imx: imx8mn: fix a53 cpu clock The A53 CCM clk root only accepts input up to 1GHz, CCM A53 root signoff timing is 1Ghz, however the A53 core which sources from CCM root could run above 1GHz which voilates the CCM. There is a CORE_SEL slice before A53 core, we need configure the CORE_SEL slice source from ARM PLL, not A53 CCM clk root. The A53 CCM clk root should only be used when need to change ARM PLL frequency. Add arm_a53_core clk that could source from arm_a53_div and arm_pll_out. Configure a53 ccm root sources from 800MHz sys pll Configure a53 core sources from arm_pll_out Mark arm_a53_core as critical clk. Fixes: 96d6392b54db ("clk: imx: Add support for i.MX8MN clock driver") Reviewed-by: Jacky Bai Signed-off-by: Peng Fan Signed-off-by: Shawn Guo --- drivers/clk/imx/clk-imx8mn.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) (limited to 'drivers/clk/imx') diff --git a/drivers/clk/imx/clk-imx8mn.c b/drivers/clk/imx/clk-imx8mn.c index fb47f86e35e8..83618affca8b 100644 --- a/drivers/clk/imx/clk-imx8mn.c +++ b/drivers/clk/imx/clk-imx8mn.c @@ -38,6 +38,8 @@ static const char * const imx8mn_a53_sels[] = {"osc_24m", "arm_pll_out", "sys_pl "sys_pll2_1000m", "sys_pll1_800m", "sys_pll1_400m", "audio_pll1_out", "sys_pll3_out", }; +static const char * const imx8mn_a53_core_sels[] = {"arm_a53_div", "arm_pll_out", }; + static const char * const imx8mn_gpu_core_sels[] = {"osc_24m", "gpu_pll_out", "sys_pll1_800m", "sys_pll3_out", "sys_pll2_1000m", "audio_pll1_out", "video_pll1_out", "audio_pll2_out", }; @@ -425,6 +427,9 @@ static int imx8mn_clocks_probe(struct platform_device *pdev) hws[IMX8MN_CLK_GPU_SHADER_CG] = hws[IMX8MN_CLK_GPU_SHADER]; hws[IMX8MN_CLK_GPU_SHADER_DIV] = hws[IMX8MN_CLK_GPU_SHADER]; + /* CORE SEL */ + hws[IMX8MN_CLK_A53_CORE] = imx_clk_hw_mux2_flags("arm_a53_core", base + 0x9880, 24, 1, imx8mn_a53_core_sels, ARRAY_SIZE(imx8mn_a53_core_sels), CLK_IS_CRITICAL); + /* BUS */ hws[IMX8MN_CLK_MAIN_AXI] = imx8m_clk_hw_composite_critical("main_axi", imx8mn_main_axi_sels, base + 0x8800); hws[IMX8MN_CLK_ENET_AXI] = imx8m_clk_hw_composite("enet_axi", imx8mn_enet_axi_sels, base + 0x8880); @@ -554,11 +559,14 @@ static int imx8mn_clocks_probe(struct platform_device *pdev) hws[IMX8MN_CLK_DRAM_ALT_ROOT] = imx_clk_hw_fixed_factor("dram_alt_root", "dram_alt", 1, 4); - hws[IMX8MN_CLK_ARM] = imx_clk_hw_cpu("arm", "arm_a53_div", - hws[IMX8MN_CLK_A53_DIV]->clk, - hws[IMX8MN_CLK_A53_SRC]->clk, + clk_hw_set_parent(hws[IMX8MN_CLK_A53_SRC], hws[IMX8MN_SYS_PLL1_800M]); + clk_hw_set_parent(hws[IMX8MN_CLK_A53_CORE], hws[IMX8MN_ARM_PLL_OUT]); + + hws[IMX8MN_CLK_ARM] = imx_clk_hw_cpu("arm", "arm_a53_core", + hws[IMX8MN_CLK_A53_CORE]->clk, + hws[IMX8MN_CLK_A53_CORE]->clk, hws[IMX8MN_ARM_PLL_OUT]->clk, - hws[IMX8MN_SYS_PLL1_800M]->clk); + hws[IMX8MN_CLK_A53_DIV]->clk); imx_check_clk_hws(hws, IMX8MN_CLK_END); -- cgit v1.2.3