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Date: Thu, 10 Mar 2016 14:02:43 +0300 From: Alexander Kochetkov <al.kochet@...il.com> To: Vinod Koul <vinod.koul@...el.com>, Dan Williams <dan.j.williams@...el.com>, dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org Cc: Caesar Wang <wxt@...k-chips.com>, Doug Anderson <dianders@...omium.org>, linux-rockchip@...ts.infradead.org, Heiko Stuebner <heiko@...ech.de>, Alexander Kochetkov <al.kochet@...il.com> Subject: [PATCH 2/3 v3] dmaengine: pl330: don't emit code for one iteration loop The patch remove one iteration outer loop in the _loop(). Removing loop saves 4 bytes of MicroCode buffer. DMALP_0 0 ... DMALPENDA_0 bjmpto_9 Signed-off-by: Alexander Kochetkov <al.kochet@...il.com> Reviewed-by: Caesar Wang <wxt@...k-chips.com> --- drivers/dma/pl330.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c index 4abbc71..b080d70 100644 --- a/drivers/dma/pl330.c +++ b/drivers/dma/pl330.c @@ -1258,7 +1258,7 @@ static inline int _loop(unsigned dry_run, u8 buf[], lpend.bjump = 0; szlpend = _emit_LPEND(1, buf, &lpend); - if (lcnt0) { + if (lcnt0 > 1) { szlp *= 2; szlpend *= 2; } @@ -1274,7 +1274,7 @@ static inline int _loop(unsigned dry_run, u8 buf[], off = 0; - if (lcnt0) { + if (lcnt0 > 1) { off += _emit_LP(dry_run, &buf[off], 0, lcnt0); ljmp0 = off; } @@ -1290,7 +1290,7 @@ static inline int _loop(unsigned dry_run, u8 buf[], lpend.bjump = off - ljmp1; off += _emit_LPEND(dry_run, &buf[off], &lpend); - if (lcnt0) { + if (lcnt0 > 1) { lpend.cond = ALWAYS; lpend.forever = false; lpend.loop = 0; @@ -1299,7 +1299,7 @@ static inline int _loop(unsigned dry_run, u8 buf[], } *bursts = lcnt1 * cyc; - if (lcnt0) + if (lcnt0 > 1) *bursts *= lcnt0; return off; -- 1.7.9.5
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