Check whether thermal DIV2 throttle is active in order to report
the CPU frequency properly. This very useful for userspace tools
like cpufreq-info which show actual frequency asserted from hardware.
Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
---
drivers/clk/tegra/clk-tegra-super-cclk.c | 16 ++++++++++++++--
drivers/clk/tegra/clk-tegra30.c | 2 +-
2 files changed, 15 insertions(+), 3 deletions(-)
diff --git a/drivers/clk/tegra/clk-tegra-super-cclk.c b/drivers/clk/tegra/clk-tegra-super-cclk.c
index a03119c30456..f75822b71d0e 100644
--- a/drivers/clk/tegra/clk-tegra-super-cclk.c
+++ b/drivers/clk/tegra/clk-tegra-super-cclk.c
@@ -25,6 +25,8 @@
#define SUPER_CDIV_ENB BIT(31)
+#define TSENSOR_SLOWDOWN BIT(23)
+
static struct tegra_clk_super_mux *cclk_super;
static bool cclk_on_pllx;
@@ -47,10 +49,20 @@ static int cclk_super_set_rate(struct clk_hw *hw, unsigned long rate,
static unsigned long cclk_super_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
+ struct tegra_clk_super_mux *super = to_clk_super_mux(hw);
+ u32 val = readl_relaxed(super->reg);
+ unsigned int div2;
+
+ /* check whether thermal throttling is active */
+ if (val & TSENSOR_SLOWDOWN)
+ div2 = 2;
+ else
+ div2 = 1;
+
if (cclk_super_get_parent(hw) == PLLX_INDEX)
- return parent_rate;
+ return parent_rate / div2;
- return tegra_clk_super_ops.recalc_rate(hw, parent_rate);
+ return tegra_clk_super_ops.recalc_rate(hw, parent_rate) / div2;
}
static int cclk_super_determine_rate(struct clk_hw *hw,
diff --git a/drivers/clk/tegra/clk-tegra30.c b/drivers/clk/tegra/clk-tegra30.c
index a33688b2359e..5b6bd138be84 100644
--- a/drivers/clk/tegra/clk-tegra30.c
+++ b/drivers/clk/tegra/clk-tegra30.c
@@ -930,7 +930,7 @@ static void __init tegra30_super_clk_init(void)
/* CCLKG */
clk = tegra_clk_register_super_cclk("cclk_g", cclk_g_parents,
ARRAY_SIZE(cclk_g_parents),
- CLK_SET_RATE_PARENT,
+ CLK_SET_RATE_PARENT | CLK_GET_RATE_NOCACHE,
clk_base + CCLKG_BURST_POLICY,
0, NULL);
clks[TEGRA30_CLK_CCLK_G] = clk;
--
2.30.2
