[PATCH 6/7] clk: imx: scu: ignore clks not owned by Cortex-A partition
From: Peng Fan (OSS) <hidden>
Date: 2023-09-12 09:15:36
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
From: Peng Fan <peng.fan@nxp.com> Not register clks that not owned to current partition. CPU resources are specical resources, it is assigned in ATF, not non-secure OS, but we still need to allow cpu freq, so return true for non-secure OS for cpu resources. Otherwise there will be error log if the resources are owned by current partition: [ 19.387291] cm40_i2c_div: failed to attached the power domain -2 [ 19.389305] cm40_lpuart_div: failed to attached the power domain -2 Signed-off-by: Peng Fan <peng.fan@nxp.com> --- drivers/clk/imx/clk-scu.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+)
diff --git a/drivers/clk/imx/clk-scu.c b/drivers/clk/imx/clk-scu.c
index cd83c52e9952..be89180dd19c 100644
--- a/drivers/clk/imx/clk-scu.c
+++ b/drivers/clk/imx/clk-scu.c@@ -10,10 +10,12 @@ #include <linux/clk-provider.h> #include <linux/err.h> #include <linux/of.h> +#include <linux/firmware/imx/svc/rm.h> #include <linux/platform_device.h> #include <linux/pm_domain.h> #include <linux/pm_runtime.h> #include <linux/slab.h> +#include <xen/xen.h> #include "clk-scu.h"
@@ -670,6 +672,18 @@ static int imx_clk_scu_attach_pd(struct device *dev, u32 rsrc_id) return of_genpd_add_device(&genpdspec, dev); } +static bool imx_clk_is_resource_owned(u32 rsrc) +{ + /* + * A-core resources are special. SCFW reports they are not "owned" by + * current partition but linux can still adjust them for cpufreq. + */ + if (rsrc == IMX_SC_R_A53 || rsrc == IMX_SC_R_A72 || rsrc == IMX_SC_R_A35) + return true; + + return imx_sc_rm_is_resource_owned(ccm_ipc_handle, rsrc); +} + struct clk_hw *imx_clk_scu_alloc_dev(const char *name, const char * const *parents, int num_parents, u32 rsrc_id, u8 clk_type)
@@ -687,6 +701,9 @@ struct clk_hw *imx_clk_scu_alloc_dev(const char *name, if (!imx_scu_clk_is_valid(rsrc_id)) return ERR_PTR(-EINVAL); + if (!imx_clk_is_resource_owned(rsrc_id)) + return NULL; + pdev = platform_device_alloc(name, PLATFORM_DEVID_NONE); if (!pdev) { pr_err("%s: failed to allocate scu clk dev rsrc %d type %d\n",
@@ -869,6 +886,9 @@ struct clk_hw *__imx_clk_gpr_scu(const char *name, const char * const *parent_na return ERR_PTR(-EINVAL); } + if (!imx_clk_is_resource_owned(rsrc_id)) + return NULL; + clk = kzalloc(sizeof(*clk), GFP_KERNEL); if (!clk) { kfree(clk_node);
--
2.37.1
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