From: Reid Tonking reidt@ti.com
The default j7200 devicetree and k3_avs driver set 2GHz/1GHz frequency for A72/MSMC clks and the OPP_NOM voltage.
J7200 SOCs may support OPP_LOW Operating Performance Point: 1GHz/500MHz clks for A72/MSMC and OPP_LOW AVS voltage read from efuse.
Hence, add a config check to select OPP_LOW specs: - Check if OPP_LOW AVS voltage read from efuse is valid. - Update the clock frequencies in devicetree. - Program the OPP_LOW AVS voltage for VDD_CPU.
Signed-off-by: Reid Tonking reidt@ti.com Signed-off-by: Aniket Limaye a-limaye@ti.com
--- v2: - Fix indentation in fix_freq() - Remove the efuse data check addition from this commit, as it's not related to adding support for CONFIG_K3_OPP_LOW. The same addition was moved to the previous patch in this series. - Link to v1: https://lore.kernel.org/u-boot/20241017062911.2241167-5-a-limaye@ti.com/ --- arch/arm/mach-k3/j721e/j721e_init.c | 45 ++++++++++++++++++++++++++++- 1 file changed, 44 insertions(+), 1 deletion(-)
diff --git a/arch/arm/mach-k3/j721e/j721e_init.c b/arch/arm/mach-k3/j721e/j721e_init.c index e9ed8cb267c..de10517bb27 100644 --- a/arch/arm/mach-k3/j721e/j721e_init.c +++ b/arch/arm/mach-k3/j721e/j721e_init.c @@ -19,6 +19,7 @@ #include <fdtdec.h> #include <mmc.h> #include <remoteproc.h> +#include <k3-avs.h>
#include "../sysfw-loader.h" #include "../common.h" @@ -147,6 +148,32 @@ static void setup_navss_nb(void) writel(NB_THREADMAP_BIT1, (uintptr_t)NAVSS0_NBSS_NB1_CFG_NB_THREADMAP); }
+int fix_freq(const void *fdt) +{ + int node, ret; + u32 opp_low_freq[3]; + + node = fdt_node_offset_by_compatible(fdt, -1, "ti,am654-rproc"); + if (node < 0) { + printf("%s: A72 not found\n", __func__); + return node; + } + + /* j7200 opp low values according to data sheet */ + opp_low_freq[0] = cpu_to_fdt32(1000000000); /* 202-2 -> A72SS0_CORE0_0_ARM_CLK */ + opp_low_freq[1] = cpu_to_fdt32(200000000); /* 61-1 -> GTC0_GTC_CLK */ + opp_low_freq[2] = cpu_to_fdt32(500000000); /* 4-1 -> A72SS0_CORE0_MSMC_CLK */ + + ret = fdt_setprop((void *)fdt, node, "assigned-clock-rates", + opp_low_freq, sizeof(opp_low_freq)); + if (ret) { + printf("%s: Can not set value\n", __func__); + return ret; + } + + return 0; +} + /* * This uninitialized global variable would normal end up in the .bss section, * but the .bss is cleared between writing and reading this variable, so move @@ -301,8 +328,24 @@ void board_init_f(ulong dummy) #if defined(CONFIG_CPU_V7R) && defined(CONFIG_K3_AVS0) ret = uclass_get_device_by_driver(UCLASS_MISC, DM_DRIVER_GET(k3_avs), &dev); - if (ret) + if (!ret) { + if (IS_ENABLED(CONFIG_K3_OPP_LOW)) { + ret = k3_check_opp(dev, J721E_VDD_MPU, AM6_OPP_LOW); + if (!ret) { + ret = fix_freq(gd->fdt_blob); + if (ret) + printf("Failed to set OPP_LOW frequency\n"); + + ret = k3_avs_set_opp(dev, J721E_VDD_MPU, AM6_OPP_LOW); + if (ret) + printf("Failed to set OPP_LOW voltage\n"); + } else { + printf("Failed to enable K3_OPP_LOW\n"); + } + } + } else { printf("AVS init failed: %d\n", ret); + } #endif
#if defined(CONFIG_K3_J721E_DDRSS)