spi/pl022: use cpu_relax in the busy loop · 521999bd4a - Gogs

spi/pl022: use cpu_relax in the busy loop

This relaxes the cpu in the polling busy-wait loop.

Reported-by: Vitaly Wool <vitalywool@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

Linus Walleij 14 years ago

parent

7f9a4b9797

commit

521999bd4a

1 changed files with 1 additions and 0 deletions

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							+ 1
							
							- 0
						
drivers/spi/amba-pl022.c
							 
								View File
							
				@@ -1424,6 +1424,7 @@ static void do_polling_transfer(struct pl022 *pl022)
			
				 				message->state = STATE_ERROR;
			
				 				goto out;
			
				 			}
			
				+			cpu_relax();
			
				 		}
			
				 		/* Update total byte transferred */