On Thu, Nov 07, 2013 at 12:42:34PM +0000, Naveen Krishna Chatradhi wrote:
> On Exynos5420 the TMU(4) for GPU has a seperate clock enable bit from
> the other TMU channels(0 ~ 3). Hence, accessing TRIMINFO for base_second
> should be acompanied by enabling the respective clock.
>
> This patch which allow for a "clk_sec" clock to be specified in the
> device-tree which will be ungated when accessing the TRIMINFO register.
Missing binding document update? Or was "clk_sec" originally in the
binding but unused?
The code seems to expect "tmu_apbif_sec" as the clock name in the DT,
but this isn't mentioned in the commit message.
I grepped Documentation/devicetree in mainline, but found no reference
of either.
Thanks,
Mark.
>
> Signed-off-by: Andrew Bresticker <abrestic@xxxxxxxxxxxx>
> Signed-off-by: Naveen Krishna Chatradhi <ch.naveen@xxxxxxxxxxx>
> ---
> drivers/thermal/samsung/exynos_tmu.c | 24 +++++++++++++++++++++++-
> 1 file changed, 23 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
> index b54825a..33edd1a 100644
> --- a/drivers/thermal/samsung/exynos_tmu.c
> +++ b/drivers/thermal/samsung/exynos_tmu.c
> @@ -47,6 +47,7 @@
> * @irq_work: pointer to the irq work structure.
> * @lock: lock to implement synchronization.
> * @clk: pointer to the clock structure.
> + * @clk_sec: pointer to the clock structure for accessing the base_second.
> * @temp_error1: fused value of the first point trim.
> * @temp_error2: fused value of the second point trim.
> * @regulator: pointer to the TMU regulator structure.
> @@ -61,7 +62,7 @@ struct exynos_tmu_data {
> enum soc_type soc;
> struct work_struct irq_work;
> struct mutex lock;
> - struct clk *clk;
> + struct clk *clk, *clk_sec;
> u8 temp_error1, temp_error2;
> struct regulator *regulator;
> struct thermal_sensor_conf *reg_conf;
> @@ -152,6 +153,8 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
>
> mutex_lock(&data->lock);
> clk_enable(data->clk);
> + if (!IS_ERR(data->clk_sec))
> + clk_enable(data->clk_sec);
>
> if (TMU_SUPPORTS(pdata, READY_STATUS)) {
> status = readb(data->base + reg->tmu_status);
> @@ -306,6 +309,8 @@ skip_calib_data:
> out:
> clk_disable(data->clk);
> mutex_unlock(&data->lock);
> + if (!IS_ERR(data->clk_sec))
> + clk_disable(data->clk_sec);
>
> return ret;
> }
> @@ -457,12 +462,16 @@ static void exynos_tmu_work(struct work_struct *work)
> const struct exynos_tmu_registers *reg = pdata->registers;
> unsigned int val_irq, val_type;
>
> + if (!IS_ERR(data->clk_sec))
> + clk_enable(data->clk_sec);
> /* Find which sensor generated this interrupt */
> if (reg->tmu_irqstatus) {
> val_type = readl(data->base_second + reg->tmu_irqstatus);
> if (!((val_type >> data->id) & 0x1))
> goto out;
> }
> + if (!IS_ERR(data->clk_sec))
> + clk_disable(data->clk_sec);
>
> exynos_report_trigger(data->reg_conf);
> mutex_lock(&data->lock);
> @@ -641,6 +650,15 @@ static int exynos_tmu_probe(struct platform_device *pdev)
> if (ret)
> return ret;
>
> + data->clk_sec = devm_clk_get(&pdev->dev, "tmu_apbif_sec");
> + if (!IS_ERR(data->clk_sec)) {
> + ret = clk_prepare(data->clk_sec);
> + if (ret) {
> + dev_err(&pdev->dev, "Failed to get clock\n");
> + return PTR_ERR(data->clk_sec);
> + }
> + }
> +
> if (pdata->type == SOC_ARCH_EXYNOS4210 ||
> pdata->type == SOC_ARCH_EXYNOS4412 ||
> pdata->type == SOC_ARCH_EXYNOS5250 ||
> @@ -713,6 +731,8 @@ static int exynos_tmu_probe(struct platform_device *pdev)
> return 0;
> err_clk:
> clk_unprepare(data->clk);
> + if (!IS_ERR(data->clk_sec))
> + clk_unprepare(data->clk_sec);
> return ret;
> }
>
> @@ -725,6 +745,8 @@ static int exynos_tmu_remove(struct platform_device *pdev)
> exynos_unregister_thermal(data->reg_conf);
>
> clk_unprepare(data->clk);
> + if (!IS_ERR(data->clk_sec))
> + clk_unprepare(data->clk_sec);
>
> if (!IS_ERR(data->regulator))
> regulator_disable(data->regulator);
> --
> 1.7.10.4
>
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