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authorSowjanya Komatineni <skomatineni@nvidia.com>2019-08-16 22:41:54 +0300
committerThierry Reding <treding@nvidia.com>2019-11-11 16:53:03 +0300
commit68a14a5634dacb37d18618d62f0410f1ec69ab28 (patch)
tree2b61253f1544ba705f9830832540e212045b1e6e
parent2b8cfd6b52cbf951d9b90862d95b8473d34d02ee (diff)
downloadlinux-68a14a5634dacb37d18618d62f0410f1ec69ab28.tar.xz
clk: tegra: clk-super: Fix to enable PLLP branches to CPU
This patch has a fix to enable PLLP branches to CPU before changing the CPU cluster clock source to PLLP for Gen5 Super clock and disables PLLP branches to CPU when not in use. During system suspend entry and exit, CPU source will be switched to PLLP and this needs PLLP branches to be enabled to CPU prior to the switch. On system resume, warmboot code enables PLLP branches to CPU and powers up the CPU with PLLP clock source. Acked-by: Thierry Reding <treding@nvidia.com> Reviewed-by: Dmitry Osipenko <digetx@gmail.com> Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
-rw-r--r--drivers/clk/tegra/clk-super.c14
-rw-r--r--drivers/clk/tegra/clk-tegra-super-gen4.c7
-rw-r--r--drivers/clk/tegra/clk.c14
-rw-r--r--drivers/clk/tegra/clk.h5
4 files changed, 39 insertions, 1 deletions
diff --git a/drivers/clk/tegra/clk-super.c b/drivers/clk/tegra/clk-super.c
index 39ef31b46df5..e2a1e95a8db7 100644
--- a/drivers/clk/tegra/clk-super.c
+++ b/drivers/clk/tegra/clk-super.c
@@ -28,6 +28,9 @@
#define super_state_to_src_shift(m, s) ((m->width * s))
#define super_state_to_src_mask(m) (((1 << m->width) - 1))
+#define CCLK_SRC_PLLP_OUT0 4
+#define CCLK_SRC_PLLP_OUT4 5
+
static u8 clk_super_get_parent(struct clk_hw *hw)
{
struct tegra_clk_super_mux *mux = to_clk_super_mux(hw);
@@ -97,12 +100,23 @@ static int clk_super_set_parent(struct clk_hw *hw, u8 index)
if (index == mux->div2_index)
index = mux->pllx_index;
}
+
+ /* enable PLLP branches to CPU before selecting PLLP source */
+ if ((mux->flags & TEGRA210_CPU_CLK) &&
+ (index == CCLK_SRC_PLLP_OUT0 || index == CCLK_SRC_PLLP_OUT4))
+ tegra_clk_set_pllp_out_cpu(true);
+
val &= ~((super_state_to_src_mask(mux)) << shift);
val |= (index & (super_state_to_src_mask(mux))) << shift;
writel_relaxed(val, mux->reg);
udelay(2);
+ /* disable PLLP branches to CPU if not used */
+ if ((mux->flags & TEGRA210_CPU_CLK) &&
+ index != CCLK_SRC_PLLP_OUT0 && index != CCLK_SRC_PLLP_OUT4)
+ tegra_clk_set_pllp_out_cpu(false);
+
out:
if (mux->lock)
spin_unlock_irqrestore(mux->lock, flags);
diff --git a/drivers/clk/tegra/clk-tegra-super-gen4.c b/drivers/clk/tegra/clk-tegra-super-gen4.c
index cdfe7c9697e1..5760c978bef7 100644
--- a/drivers/clk/tegra/clk-tegra-super-gen4.c
+++ b/drivers/clk/tegra/clk-tegra-super-gen4.c
@@ -180,7 +180,7 @@ static void __init tegra_super_clk_init(void __iomem *clk_base,
gen_info->num_cclk_g_parents,
CLK_SET_RATE_PARENT,
clk_base + CCLKG_BURST_POLICY,
- 0, 4, 8, 0, NULL);
+ TEGRA210_CPU_CLK, 4, 8, 0, NULL);
} else {
clk = tegra_clk_register_super_mux("cclk_g",
gen_info->cclk_g_parents,
@@ -196,6 +196,11 @@ static void __init tegra_super_clk_init(void __iomem *clk_base,
dt_clk = tegra_lookup_dt_id(tegra_clk_cclk_lp, tegra_clks);
if (dt_clk) {
if (gen_info->gen == gen5) {
+ /*
+ * TEGRA210_CPU_CLK flag is not needed for cclk_lp as
+ * cluster switching is not currently supported on
+ * Tegra210 and also cpu_lp is not used.
+ */
clk = tegra_clk_register_super_mux("cclk_lp",
gen_info->cclk_lp_parents,
gen_info->num_cclk_lp_parents,
diff --git a/drivers/clk/tegra/clk.c b/drivers/clk/tegra/clk.c
index 573e3c967ae1..eb08047fd02f 100644
--- a/drivers/clk/tegra/clk.c
+++ b/drivers/clk/tegra/clk.c
@@ -23,6 +23,7 @@
#define CLK_OUT_ENB_W 0x364
#define CLK_OUT_ENB_X 0x280
#define CLK_OUT_ENB_Y 0x298
+#define CLK_ENB_PLLP_OUT_CPU BIT(31)
#define CLK_OUT_ENB_SET_L 0x320
#define CLK_OUT_ENB_CLR_L 0x324
#define CLK_OUT_ENB_SET_H 0x328
@@ -199,6 +200,19 @@ const struct tegra_clk_periph_regs *get_reg_bank(int clkid)
}
}
+void tegra_clk_set_pllp_out_cpu(bool enable)
+{
+ u32 val;
+
+ val = readl_relaxed(clk_base + CLK_OUT_ENB_Y);
+ if (enable)
+ val |= CLK_ENB_PLLP_OUT_CPU;
+ else
+ val &= ~CLK_ENB_PLLP_OUT_CPU;
+
+ writel_relaxed(val, clk_base + CLK_OUT_ENB_Y);
+}
+
struct clk ** __init tegra_clk_init(void __iomem *regs, int num, int banks)
{
clk_base = regs;
diff --git a/drivers/clk/tegra/clk.h b/drivers/clk/tegra/clk.h
index 7c956ce521d6..21bb0f24c6c1 100644
--- a/drivers/clk/tegra/clk.h
+++ b/drivers/clk/tegra/clk.h
@@ -669,6 +669,9 @@ struct clk *tegra_clk_register_periph_data(void __iomem *clk_base,
* Flags:
* TEGRA_DIVIDER_2 - LP cluster has additional divider. This flag indicates
* that this is LP cluster clock.
+ * TEGRA210_CPU_CLK - This flag is used to identify CPU cluster for gen5
+ * super mux parent using PLLP branches. To use PLLP branches to CPU, need
+ * to configure additional bit PLLP_OUT_CPU in the clock registers.
*/
struct tegra_clk_super_mux {
struct clk_hw hw;
@@ -685,6 +688,7 @@ struct tegra_clk_super_mux {
#define to_clk_super_mux(_hw) container_of(_hw, struct tegra_clk_super_mux, hw)
#define TEGRA_DIVIDER_2 BIT(0)
+#define TEGRA210_CPU_CLK BIT(1)
extern const struct clk_ops tegra_clk_super_ops;
struct clk *tegra_clk_register_super_mux(const char *name,
@@ -830,6 +834,7 @@ int tegra_pll_p_div_to_hw(struct tegra_clk_pll *pll, u8 p_div);
int div_frac_get(unsigned long rate, unsigned parent_rate, u8 width,
u8 frac_width, u8 flags);
void tegra_clk_osc_resume(void __iomem *clk_base);
+void tegra_clk_set_pllp_out_cpu(bool enable);
/* Combined read fence with delay */