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From: Pyun YongHyeon <yongari@FreeBSD.org>
Date: Sat, 7 Aug 2010 23:33:06 +0000 (UTC)
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Subject: svn commit: r211047 - head/sys/dev/alc
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Author: yongari
Date: Sat Aug  7 23:33:06 2010
New Revision: 211047
URL: http://svn.freebsd.org/changeset/base/211047

Log:
  Controller does not seem to support more than 1024 bytes DMA burst.
  Limit DMA burst size to be less than or equal to 1024 bytes.

Modified:
  head/sys/dev/alc/if_alc.c

Modified: head/sys/dev/alc/if_alc.c
==============================================================================
--- head/sys/dev/alc/if_alc.c	Sat Aug  7 23:16:21 2010	(r211046)
+++ head/sys/dev/alc/if_alc.c	Sat Aug  7 23:33:06 2010	(r211047)
@@ -610,6 +610,10 @@ alc_attach(device_t dev)
 			device_printf(dev, "TLP payload size : %u bytes.\n",
 			    alc_dma_burst[sc->alc_dma_wr_burst]);
 		}
+		if (alc_dma_burst[sc->alc_dma_rd_burst] > 1024)
+			sc->alc_dma_rd_burst = 3;
+		if (alc_dma_burst[sc->alc_dma_wr_burst] > 1024)
+			sc->alc_dma_wr_burst = 3;
 		/* Clear data link and flow-control protocol error. */
 		val = CSR_READ_4(sc, ALC_PEX_UNC_ERR_SEV);
 		val &= ~(PEX_UNC_ERR_SEV_DLP | PEX_UNC_ERR_SEV_FCP);