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Commit 17075504 authored by Philipp Zabel's avatar Philipp Zabel Committed by Russell King
Browse files

imx-drm: ipu-common: add helpers to check for a busy IDMAC channel and to busywait for an interrupt 



Signed-off-by: default avatarPhilipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 861a50c1

drivers/staging/imx-drm/ipu-v3/ipu-common.c

+22 −0
Original line number Diff line number Diff line
@@ -697,6 +697,12 @@ int ipu_idmac_enable_channel(struct ipuv3_channel *channel) 
}

EXPORT_SYMBOL_GPL(ipu_idmac_enable_channel);



bool ipu_idmac_channel_busy(struct ipu_soc *ipu, unsigned int chno)

{

	return (ipu_idmac_read(ipu, IDMAC_CHA_BUSY(chno)) & idma_mask(chno));

}

EXPORT_SYMBOL_GPL(ipu_idmac_channel_busy);



int ipu_idmac_wait_busy(struct ipuv3_channel *channel, int ms)

{

	struct ipu_soc *ipu = channel->ipu;
@@ -714,6 +720,22 @@ int ipu_idmac_wait_busy(struct ipuv3_channel *channel, int ms) 
}

EXPORT_SYMBOL_GPL(ipu_idmac_wait_busy);



int ipu_wait_interrupt(struct ipu_soc *ipu, int irq, int ms)

{

	unsigned long timeout;



	timeout = jiffies + msecs_to_jiffies(ms);

	ipu_cm_write(ipu, BIT(irq % 32), IPU_INT_STAT(irq / 32));

	while (!(ipu_cm_read(ipu, IPU_INT_STAT(irq / 32) & BIT(irq % 32)))) {

		if (time_after(jiffies, timeout))

			return -ETIMEDOUT;

		cpu_relax();

	}



	return 0;

}

EXPORT_SYMBOL_GPL(ipu_wait_interrupt);



int ipu_idmac_disable_channel(struct ipuv3_channel *channel)

{

	struct ipu_soc *ipu = channel->ipu;

drivers/staging/imx-drm/ipu-v3/ipu-prv.h

+3 −0
Original line number Diff line number Diff line
@@ -185,6 +185,9 @@ void ipu_srm_dp_sync_update(struct ipu_soc *ipu); 
int ipu_module_enable(struct ipu_soc *ipu, u32 mask);

int ipu_module_disable(struct ipu_soc *ipu, u32 mask);



bool ipu_idmac_channel_busy(struct ipu_soc *ipu, unsigned int chno);

int ipu_wait_interrupt(struct ipu_soc *ipu, int irq, int ms);



int ipu_di_init(struct ipu_soc *ipu, struct device *dev, int id,

		unsigned long base, u32 module, struct clk *ipu_clk);

void ipu_di_exit(struct ipu_soc *ipu, int id);