Tegra has a blink timer register that allows to modulate the
clk_32k clock before outputting it. Since clk_32k is presented to the
kernel as a fixed clock, make sure this register does not tamper with
the clock frequency and that clk_32k is outputted as-is, similarly to
what is done on t20 and t30.
Signed-off-by: Alexandre Courbot <[email protected]>
---
drivers/clk/tegra/clk-tegra114.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/clk/tegra/clk-tegra114.c b/drivers/clk/tegra/clk-tegra114.c
index d78e16e..dc76d67 100644
--- a/drivers/clk/tegra/clk-tegra114.c
+++ b/drivers/clk/tegra/clk-tegra114.c
@@ -127,6 +127,7 @@
#define PMC_DPD_PADS_ORIDE_BLINK_ENB 20
#define PMC_CTRL 0
#define PMC_CTRL_BLINK_ENB 7
+#define PMC_BLINK_TIMER 0x40
#define OSC_CTRL 0x50
#define OSC_CTRL_OSC_FREQ_SHIFT 28
@@ -1625,6 +1626,8 @@ static void __init tegra114_pmc_clk_init(void __iomem *pmc_base)
clks[clk_out_3] = clk;
/* blink */
+ /* clear the blink timer register to directly output clk_32k */
+ writel_relaxed(0, pmc_base + PMC_BLINK_TIMER);
clk = clk_register_gate(NULL, "blink_override", "clk_32k", 0,
pmc_base + PMC_DPD_PADS_ORIDE,
PMC_DPD_PADS_ORIDE_BLINK_ENB, 0, NULL);
--
1.8.2.3
On 05/24/2013 01:10 AM, Alexandre Courbot wrote:
> Tegra has a blink timer register that allows to modulate the
> clk_32k clock before outputting it. Since clk_32k is presented to the
> kernel as a fixed clock, make sure this register does not tamper with
> the clock frequency and that clk_32k is outputted as-is, similarly to
> what is done on t20 and t30.
drivers/clk changes should go to Mike Turquette now that there aren't
any inter-dependencies between core Tegra and Tegra clk driver patches.
I CC'd him here, but perhaps he'll want this resent if he doesn't have
the original email still.
Acked-by: Stephen Warren <[email protected]>
On Sat, May 25, 2013 at 12:30 AM, Stephen Warren <[email protected]> wrote:
> On 05/24/2013 01:10 AM, Alexandre Courbot wrote:
>> Tegra has a blink timer register that allows to modulate the
>> clk_32k clock before outputting it. Since clk_32k is presented to the
>> kernel as a fixed clock, make sure this register does not tamper with
>> the clock frequency and that clk_32k is outputted as-is, similarly to
>> what is done on t20 and t30.
>
> drivers/clk changes should go to Mike Turquette now that there aren't
> any inter-dependencies between core Tegra and Tegra clk driver patches.
>
> I CC'd him here, but perhaps he'll want this resent if he doesn't have
> the original email still.
I just resent the patch to make things easier.
Thanks,
Alex.