[3/6] devfreq: rk3399_dmc: remove wait for dcf irq event.

Commit Message

Enric Balletbo i Serra April 19, 2018, 10:40 a.m. UTC

We have already wait dcf done in ATF, so don't need wait dcf irq
in kernel, besides, clear dcf irq in kernel will import competiton
between kernel and ATF, only handle dcf irq in ATF is a better way.

Signed-off-by: Lin Huang <[e-mail]>
Signed-off-by: Enric Balletbo i Serra <[e-mail]>
---

 drivers/devfreq/rk3399_dmc.c | 53 +-----------------------------------
 1 file changed, 1 insertion(+), 52 deletions(-)

Comments

MyungJoo Ham April 24, 2018, 2:31 a.m. UTC | #1

> We have already wait dcf done in ATF, so don't need wait dcf irq
> in kernel, besides, clear dcf irq in kernel will import competiton
> between kernel and ATF, only handle dcf irq in ATF is a better way.
> 
> Signed-off-by: Lin Huang <[e-mail]>
> Signed-off-by: Enric Balletbo i Serra <[e-mail]>

This does not apply to 4.17-rc2 or a little less recent rc's.

Would you please rebase to the latest?


Cheers,
MyungJoo

> ---
> 
>  drivers/devfreq/rk3399_dmc.c | 53 +-----------------------------------
>  1 file changed, 1 insertion(+), 52 deletions(-)
> 
> diff --git a/drivers/devfreq/rk3399_dmc.c b/drivers/devfreq/rk3399_dmc.c
> index 5dfbfa3cc878..44a379657cd5 100644
>

Chanwoo Choi April 24, 2018, 3:55 a.m. UTC | #2

Hi,

On 2018년 04월 19일 19:40, Enric Balletbo i Serra wrote:
> We have already wait dcf done in ATF, so don't need wait dcf irq
> in kernel, besides, clear dcf irq in kernel will import competiton
> between kernel and ATF, only handle dcf irq in ATF is a better way.
> 
> Signed-off-by: Lin Huang <[e-mail]>
> Signed-off-by: Enric Balletbo i Serra <[e-mail]>
> ---

The dcf_irq depends on the architecture and device. It means that
the author or other people access the confidential document
have to guarantee this change. So, Lin Huang is one of author of this patch,
looks good to me.

Reviewed-by: Chanwoo Choi <[e-mail]>

[snip]

Patch

diff --git a/drivers/devfreq/rk3399_dmc.c b/drivers/devfreq/rk3399_dmc.c
index 5dfbfa3cc878..44a379657cd5 100644
--- a/drivers/devfreq/rk3399_dmc.c
+++ b/drivers/devfreq/rk3399_dmc.c
@@ -68,15 +68,6 @@  struct rk3399_dmcfreq {
 	struct devfreq_event_dev *edev;
 	struct mutex lock;
 	struct dram_timing timing;
-
-	/*
-	 * DDR Converser of Frequency (DCF) is used to implement DDR frequency
-	 * conversion without the participation of CPU, we will implement and
-	 * control it in arm trust firmware.
-	 */
-	wait_queue_head_t	wait_dcf_queue;
-	int irq;
-	int wait_dcf_flag;
 	struct regulator *vdd_center;
 	unsigned long rate, target_rate;
 	unsigned long volt, target_volt;
@@ -117,7 +108,6 @@  static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
 			goto out;
 		}
 	}
-	dmcfreq->wait_dcf_flag = 1;
 
 	err = clk_set_rate(dmcfreq->dmc_clk, target_rate);
 	if (err) {
@@ -128,14 +118,6 @@  static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
 		goto out;
 	}
 
-	/*
-	 * Wait until bcf irq happen, it means freq scaling finish in
-	 * arm trust firmware, use 100ms as timeout time.
-	 */
-	if (!wait_event_timeout(dmcfreq->wait_dcf_queue,
-				!dmcfreq->wait_dcf_flag, HZ / 10))
-		dev_warn(dev, "Timeout waiting for dcf interrupt\n");
-
 	/*
 	 * Check the dpll rate,
 	 * There only two result we will get,
@@ -241,22 +223,6 @@  static __maybe_unused int rk3399_dmcfreq_resume(struct device *dev)
 static SIMPLE_DEV_PM_OPS(rk3399_dmcfreq_pm, rk3399_dmcfreq_suspend,
 			 rk3399_dmcfreq_resume);
 
-static irqreturn_t rk3399_dmc_irq(int irq, void *dev_id)
-{
-	struct rk3399_dmcfreq *dmcfreq = dev_id;
-	struct arm_smccc_res res;
-
-	dmcfreq->wait_dcf_flag = 0;
-	wake_up(&dmcfreq->wait_dcf_queue);
-
-	/* Clear the DCF interrupt */
-	arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, 0, 0,
-		      ROCKCHIP_SIP_CONFIG_DRAM_CLR_IRQ,
-		      0, 0, 0, 0, &res);
-
-	return IRQ_HANDLED;
-}
-
 static int of_get_ddr_timings(struct dram_timing *timing,
 			      struct device_node *np)
 {
@@ -330,16 +296,10 @@  static int rk3399_dmcfreq_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct device_node *np = pdev->dev.of_node;
 	struct rk3399_dmcfreq *data;
-	int ret, irq, index, size;
+	int ret, index, size;
 	uint32_t *timing;
 	struct dev_pm_opp *opp;
 
-	irq = platform_get_irq(pdev, 0);
-	if (irq < 0) {
-		dev_err(&pdev->dev,
-			"Cannot get the dmc interrupt resource: %d\n", irq);
-		return irq;
-	}
 	data = devm_kzalloc(dev, sizeof(struct rk3399_dmcfreq), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;
@@ -358,17 +318,6 @@  static int rk3399_dmcfreq_probe(struct platform_device *pdev)
 		return PTR_ERR(data->dmc_clk);
 	};
 
-	data->irq = irq;
-	ret = devm_request_irq(dev, irq, rk3399_dmc_irq, 0,
-			       dev_name(dev), data);
-	if (ret) {
-		dev_err(dev, "Failed to request dmc irq: %d\n", ret);
-		return ret;
-	}
-
-	init_waitqueue_head(&data->wait_dcf_queue);
-	data->wait_dcf_flag = 0;
-
 	data->edev = devfreq_event_get_edev_by_phandle(dev, 0);
 	if (IS_ERR(data->edev))
 		return -EPROBE_DEFER;