From 603044d883d610acdb44daecf94b0fca48880b5c Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Sun, 27 Jun 2010 08:32:11 -0300 Subject: [PATCH] V4L/DVB: em28xx-input: Don't generate one debug message for every get_key read Instead of generating one printk for every IR read, prints it only when count is different from the last count. While here, as this code is called on every 100ms during the runtime lifetime, do some performance optimization, assuming that, under normal circumstances, it is unlikely that the driver would get a new key/key repeat on every poll. Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/em28xx/em28xx-input.c | 33 +++++++++++------------ 1 file changed, 15 insertions(+), 18 deletions(-) diff --git a/drivers/media/video/em28xx/em28xx-input.c b/drivers/media/video/em28xx/em28xx-input.c index dd6d528998b1..6759cd5570dd 100644 --- a/drivers/media/video/em28xx/em28xx-input.c +++ b/drivers/media/video/em28xx/em28xx-input.c @@ -292,18 +292,15 @@ static void em28xx_ir_handle_key(struct em28xx_IR *ir) /* read the registers containing the IR status */ result = ir->get_key(ir, &poll_result); - if (result < 0) { + if (unlikely(result < 0)) { dprintk("ir->get_key() failed %d\n", result); return; } - dprintk("ir->get_key result tb=%02x rc=%02x lr=%02x data=%02x%02x\n", - poll_result.toggle_bit, poll_result.read_count, - ir->last_readcount, poll_result.rc_address, - poll_result.rc_data[0]); - - if (poll_result.read_count > 0 && - poll_result.read_count != ir->last_readcount) { + if (unlikely(poll_result.read_count != ir->last_readcount)) { + dprintk("%s: toggle: %d, count: %d, key 0x%02x%02x\n", __func__, + poll_result.toggle_bit, poll_result.read_count, + poll_result.rc_address, poll_result.rc_data[0]); if (ir->full_code) ir_keydown(ir->input, poll_result.rc_address << 8 | @@ -313,17 +310,17 @@ static void em28xx_ir_handle_key(struct em28xx_IR *ir) ir_keydown(ir->input, poll_result.rc_data[0], poll_result.toggle_bit); - } - if (ir->dev->chip_id == CHIP_ID_EM2874) - /* The em2874 clears the readcount field every time the - register is read. The em2860/2880 datasheet says that it - is supposed to clear the readcount, but it doesn't. So with - the em2874, we are looking for a non-zero read count as - opposed to a readcount that is incrementing */ - ir->last_readcount = 0; - else - ir->last_readcount = poll_result.read_count; + if (ir->dev->chip_id == CHIP_ID_EM2874) + /* The em2874 clears the readcount field every time the + register is read. The em2860/2880 datasheet says that it + is supposed to clear the readcount, but it doesn't. So with + the em2874, we are looking for a non-zero read count as + opposed to a readcount that is incrementing */ + ir->last_readcount = 0; + else + ir->last_readcount = poll_result.read_count; + } } static void em28xx_ir_work(struct work_struct *work) -- 2.20.1