From 17075504688baf04567fc47c4a2a6ab8684b13e9 Mon Sep 17 00:00:00 2001 From: Philipp Zabel Date: Mon, 14 Apr 2014 23:53:17 +0200 Subject: [PATCH] imx-drm: ipu-common: add helpers to check for a busy IDMAC channel and to busywait for an interrupt Signed-off-by: Philipp Zabel Signed-off-by: Russell King --- drivers/staging/imx-drm/ipu-v3/ipu-common.c | 22 +++++++++++++++++++++ drivers/staging/imx-drm/ipu-v3/ipu-prv.h | 3 +++ 2 files changed, 25 insertions(+) diff --git a/drivers/staging/imx-drm/ipu-v3/ipu-common.c b/drivers/staging/imx-drm/ipu-v3/ipu-common.c index 058551795677..8fb4c207f3f1 100644 --- a/drivers/staging/imx-drm/ipu-v3/ipu-common.c +++ b/drivers/staging/imx-drm/ipu-v3/ipu-common.c @@ -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; diff --git a/drivers/staging/imx-drm/ipu-v3/ipu-prv.h b/drivers/staging/imx-drm/ipu-v3/ipu-prv.h index 4df00501adc2..bfc1b3366488 100644 --- a/drivers/staging/imx-drm/ipu-v3/ipu-prv.h +++ b/drivers/staging/imx-drm/ipu-v3/ipu-prv.h @@ -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); -- 2.20.1