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author | Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> | 2022-10-26 02:42:26 +0100 |
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committer | Geert Uytterhoeven <geert+renesas@glider.be> | 2022-10-28 14:35:57 +0200 |
commit | 3702cff6d9385565b1ea2670a5623f9695412019 (patch) | |
tree | 099ab79a8551ffe0148e0e54aabcac7521a12eec /drivers/clk/renesas | |
parent | c82009584edb36dade0598dce840bed725cfcd56 (diff) | |
download | linux-stable-3702cff6d9385565b1ea2670a5623f9695412019.tar.gz linux-stable-3702cff6d9385565b1ea2670a5623f9695412019.tar.bz2 linux-stable-3702cff6d9385565b1ea2670a5623f9695412019.zip |
clk: renesas: rzg2l: Don't assume all CPG_MOD clocks support PM
There are cases where not all CPG_MOD clocks should be assumed to support
PM. For example on the CRU block there is a particular sequence that needs
to be followed to initialize the CSI-2 D-PHY in which individual clocks
need to be turned ON/OFF, due to which Runtime PM support wasn't used by
the CRU CSI-2 driver.
This patch adds support to allow indicating if PM is not supported by the
CPG_MOD clocks. Two new members no_pm_mod_clks and num_no_pm_mod_clks are
added to struct rzg2l_cpg_info so that MOD clocks which do not support PM
can be passed by no_pm_mod_clks[] array and when the driver uses Runtime
PM support the clk ID is matched against the no_pm_mod_clks[] array to see
if the clk is needed to be included as part of Runtime PM.
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/20221026014227.162121-2-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Diffstat (limited to 'drivers/clk/renesas')
-rw-r--r-- | drivers/clk/renesas/rzg2l-cpg.c | 39 | ||||
-rw-r--r-- | drivers/clk/renesas/rzg2l-cpg.h | 4 |
2 files changed, 28 insertions, 15 deletions
diff --git a/drivers/clk/renesas/rzg2l-cpg.c b/drivers/clk/renesas/rzg2l-cpg.c index dfd676310ce9..4bf40f6ccd1d 100644 --- a/drivers/clk/renesas/rzg2l-cpg.c +++ b/drivers/clk/renesas/rzg2l-cpg.c @@ -95,6 +95,7 @@ struct rzg2l_pll5_mux_dsi_div_param { * @num_resets: Number of Module Resets in info->resets[] * @last_dt_core_clk: ID of the last Core Clock exported to DT * @info: Pointer to platform data + * @genpd: PM domain * @mux_dsi_div_params: pll5 mux and dsi div parameters */ struct rzg2l_cpg_priv { @@ -111,6 +112,8 @@ struct rzg2l_cpg_priv { const struct rzg2l_cpg_info *info; + struct generic_pm_domain genpd; + struct rzg2l_pll5_mux_dsi_div_param mux_dsi_div_params; }; @@ -1223,22 +1226,31 @@ static int rzg2l_cpg_reset_controller_register(struct rzg2l_cpg_priv *priv) return devm_reset_controller_register(priv->dev, &priv->rcdev); } -static bool rzg2l_cpg_is_pm_clk(const struct of_phandle_args *clkspec) +static bool rzg2l_cpg_is_pm_clk(struct rzg2l_cpg_priv *priv, + const struct of_phandle_args *clkspec) { + const struct rzg2l_cpg_info *info = priv->info; + unsigned int id; + unsigned int i; + if (clkspec->args_count != 2) return false; - switch (clkspec->args[0]) { - case CPG_MOD: - return true; - - default: + if (clkspec->args[0] != CPG_MOD) return false; + + id = clkspec->args[1] + info->num_total_core_clks; + for (i = 0; i < info->num_no_pm_mod_clks; i++) { + if (info->no_pm_mod_clks[i] == id) + return false; } + + return true; } -static int rzg2l_cpg_attach_dev(struct generic_pm_domain *unused, struct device *dev) +static int rzg2l_cpg_attach_dev(struct generic_pm_domain *domain, struct device *dev) { + struct rzg2l_cpg_priv *priv = container_of(domain, struct rzg2l_cpg_priv, genpd); struct device_node *np = dev->of_node; struct of_phandle_args clkspec; bool once = true; @@ -1248,7 +1260,7 @@ static int rzg2l_cpg_attach_dev(struct generic_pm_domain *unused, struct device while (!of_parse_phandle_with_args(np, "clocks", "#clock-cells", i, &clkspec)) { - if (rzg2l_cpg_is_pm_clk(&clkspec)) { + if (rzg2l_cpg_is_pm_clk(priv, &clkspec)) { if (once) { once = false; error = pm_clk_create(dev); @@ -1298,16 +1310,13 @@ static void rzg2l_cpg_genpd_remove(void *data) pm_genpd_remove(data); } -static int __init rzg2l_cpg_add_clk_domain(struct device *dev) +static int __init rzg2l_cpg_add_clk_domain(struct rzg2l_cpg_priv *priv) { + struct device *dev = priv->dev; struct device_node *np = dev->of_node; - struct generic_pm_domain *genpd; + struct generic_pm_domain *genpd = &priv->genpd; int ret; - genpd = devm_kzalloc(dev, sizeof(*genpd), GFP_KERNEL); - if (!genpd) - return -ENOMEM; - genpd->name = np->name; genpd->flags = GENPD_FLAG_PM_CLK | GENPD_FLAG_ALWAYS_ON | GENPD_FLAG_ACTIVE_WAKEUP; @@ -1377,7 +1386,7 @@ static int __init rzg2l_cpg_probe(struct platform_device *pdev) if (error) return error; - error = rzg2l_cpg_add_clk_domain(dev); + error = rzg2l_cpg_add_clk_domain(priv); if (error) return error; diff --git a/drivers/clk/renesas/rzg2l-cpg.h b/drivers/clk/renesas/rzg2l-cpg.h index cecbdf5e4f93..eee780276a9e 100644 --- a/drivers/clk/renesas/rzg2l-cpg.h +++ b/drivers/clk/renesas/rzg2l-cpg.h @@ -256,6 +256,10 @@ struct rzg2l_cpg_info { unsigned int num_mod_clks; unsigned int num_hw_mod_clks; + /* No PM Module Clocks */ + const unsigned int *no_pm_mod_clks; + unsigned int num_no_pm_mod_clks; + /* Resets */ const struct rzg2l_reset *resets; unsigned int num_resets; |