From e90460970fde8bdccf2147e899cb9953943e16d2 Mon Sep 17 00:00:00 2001 From: Philipp Zabel Date: Wed, 16 May 2012 17:28:29 +0200 Subject: gpu: ipu-v3: Add ipu_idmac_get_current_buffer function This function returns the currently active buffer (0 or 1) of a double buffered IDMAC channel. It is to be used by the CSI driver. Signed-off-by: Philipp Zabel --- drivers/gpu/ipu-v3/ipu-common.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'drivers/gpu/ipu-v3') diff --git a/drivers/gpu/ipu-v3/ipu-common.c b/drivers/gpu/ipu-v3/ipu-common.c index 2aecc474c478..9459f4091a27 100644 --- a/drivers/gpu/ipu-v3/ipu-common.c +++ b/drivers/gpu/ipu-v3/ipu-common.c @@ -661,6 +661,15 @@ int ipu_module_disable(struct ipu_soc *ipu, u32 mask) } EXPORT_SYMBOL_GPL(ipu_module_disable); +int ipu_idmac_get_current_buffer(struct ipuv3_channel *channel) +{ + struct ipu_soc *ipu = channel->ipu; + unsigned int chno = channel->num; + + return (ipu_cm_read(ipu, IPU_CHA_CUR_BUF(chno)) & idma_mask(chno)) ? 1 : 0; +} +EXPORT_SYMBOL_GPL(ipu_idmac_get_current_buffer); + void ipu_idmac_select_buffer(struct ipuv3_channel *channel, u32 buf_num) { struct ipu_soc *ipu = channel->ipu; -- cgit v1.2.3