Commit e04f9f42 authored by Michael Hennerich's avatar Michael Hennerich Committed by Bryan Wu
Browse files

Blackfin arch: Remove useless SSYNCs in DMA code 



Tons of SSYNC operation will impact the DMA performance

Signed-off-by: default avatarBryan Wu <cooloney@kernel.org>
parent a2ba8b19

arch/blackfin/kernel/bfin_dma_5xx.c

+1 −13
Original line number Diff line number Diff line
@@ -53,7 +53,6 @@ static void clear_dma_buffer(unsigned int channel) 
	dma_ch[channel].regs->cfg |= RESTART;

	SSYNC();

	dma_ch[channel].regs->cfg &= ~RESTART;

	SSYNC();

}



static int __init blackfin_dma_init(void)
@@ -245,7 +244,6 @@ void enable_dma(unsigned int channel) 
	dma_ch[channel].regs->curr_y_count = 0;



	dma_ch[channel].regs->cfg |= DMAEN;	/* Set the enable bit */

	SSYNC();

	pr_debug("enable_dma() : END \n");

	return;

}
@@ -265,7 +263,6 @@ void set_dma_start_addr(unsigned int channel, unsigned long addr) 
	       && channel < MAX_BLACKFIN_DMA_CHANNEL));



	dma_ch[channel].regs->start_addr = addr;

	SSYNC();

	pr_debug("set_dma_start_addr() : END\n");

}

EXPORT_SYMBOL(set_dma_start_addr);
@@ -278,7 +275,6 @@ void set_dma_next_desc_addr(unsigned int channel, unsigned long addr) 
	       && channel < MAX_BLACKFIN_DMA_CHANNEL));



	dma_ch[channel].regs->next_desc_ptr = addr;

	SSYNC();

	pr_debug("set_dma_next_desc_addr() : END\n");

}

EXPORT_SYMBOL(set_dma_next_desc_addr);
@@ -291,7 +287,6 @@ void set_dma_curr_desc_addr(unsigned int channel, unsigned long addr) 
	       && channel < MAX_BLACKFIN_DMA_CHANNEL));



	dma_ch[channel].regs->curr_desc_ptr = addr;

	SSYNC();

	pr_debug("set_dma_curr_desc_addr() : END\n");

}

EXPORT_SYMBOL(set_dma_curr_desc_addr);
@@ -302,7 +297,6 @@ void set_dma_x_count(unsigned int channel, unsigned short x_count) 
	       && channel < MAX_BLACKFIN_DMA_CHANNEL));



	dma_ch[channel].regs->x_count = x_count;

	SSYNC();

}

EXPORT_SYMBOL(set_dma_x_count);
@@ -312,7 +306,6 @@ void set_dma_y_count(unsigned int channel, unsigned short y_count) 
	       && channel < MAX_BLACKFIN_DMA_CHANNEL));



	dma_ch[channel].regs->y_count = y_count;

	SSYNC();

}

EXPORT_SYMBOL(set_dma_y_count);
@@ -322,7 +315,6 @@ void set_dma_x_modify(unsigned int channel, short x_modify) 
	       && channel < MAX_BLACKFIN_DMA_CHANNEL));



	dma_ch[channel].regs->x_modify = x_modify;

	SSYNC();

}

EXPORT_SYMBOL(set_dma_x_modify);
@@ -332,7 +324,6 @@ void set_dma_y_modify(unsigned int channel, short y_modify) 
	       && channel < MAX_BLACKFIN_DMA_CHANNEL));



	dma_ch[channel].regs->y_modify = y_modify;

	SSYNC();

}

EXPORT_SYMBOL(set_dma_y_modify);
@@ -342,7 +333,7 @@ void set_dma_config(unsigned int channel, unsigned short config) 
	       && channel < MAX_BLACKFIN_DMA_CHANNEL));



	dma_ch[channel].regs->cfg = config;

	SSYNC();



}

EXPORT_SYMBOL(set_dma_config);
@@ -367,8 +358,6 @@ void set_dma_sg(unsigned int channel, struct dmasg *sg, int nr_sg) 
	dma_ch[channel].regs->cfg |= ((nr_sg & 0x0F) << 8);



	dma_ch[channel].regs->next_desc_ptr = (unsigned int)sg;



	SSYNC();

}

EXPORT_SYMBOL(set_dma_sg);
@@ -378,7 +367,6 @@ void set_dma_curr_addr(unsigned int channel, unsigned long addr) 
	       && channel < MAX_BLACKFIN_DMA_CHANNEL));



	dma_ch[channel].regs->curr_addr_ptr = addr;

	SSYNC();

}

EXPORT_SYMBOL(set_dma_curr_addr);