gpu: ipu-v3: Remove unused ipu_idmac_channel_busy

The last use of ipu_idmac_channel_busy() was removed in 2017 by
commit eb8c888 ("drm/imx: add deferred plane disabling")

Remove it.

Signed-off-by: Dr. David Alan Gilbert <[email protected]>
Reviewed-by: Dmitry Baryshkov <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Dmitry Baryshkov <[email protected]>

Author: Dr. David Alan Gilbert

drivers/gpu/ipu-v3/ipu-common.c

@@ -484,12 +484,6 @@ 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;

drivers/gpu/ipu-v3/ipu-prv.h

@@ -216,8 +216,6 @@ void ipu_srm_dp_update(struct ipu_soc *ipu, bool sync);
 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_csi_init(struct ipu_soc *ipu, struct device *dev, int id,
 		 unsigned long base, u32 module, struct clk *clk_ipu);
 void ipu_csi_exit(struct ipu_soc *ipu, int id);