unimore/kernel-hacking-2024-linux-steffo
unimore/kernel-hacking-2024-linux-steffo
1
Fork 0
Code Pull requests 5 Wiki Activity

Blackfin arch: Remove useless SSYNCs in DMA code

Browse source 
Tons of SSYNC operation will impact the DMA performance

Signed-off-by: Bryan Wu <cooloney@kernel.org>
This commit is contained in:
Michael Hennerich 2008-10-28 18:18:47 +08:00 committed by Bryan Wu
parent a2ba8b1998
commit e04f9f427b
1 changed files with 1 additions and 13 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

14
arch/blackfin/kernel/bfin_dma_5xx.c
View file

@ -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);