Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758374AbZIQQZe (ORCPT ); Thu, 17 Sep 2009 12:25:34 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754765AbZIQQZe (ORCPT ); Thu, 17 Sep 2009 12:25:34 -0400 Received: from smtp.gentoo.org ([140.211.166.183]:44939 "EHLO smtp.gentoo.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752260AbZIQQZd (ORCPT ); Thu, 17 Sep 2009 12:25:33 -0400 From: Mike Frysinger To: linux-usb@vger.kernel.org, Felipe Balbi Cc: linux-kernel@vger.kernel.org, uclinux-dist-devel@blackfin.uclinux.org, Sonic Zhang , Cliff Cai Subject: [PATCH 05/12 v2] USB: musb: add notes for Blackfin anomalies Date: Thu, 17 Sep 2009 12:25:34 -0400 Message-Id: <1253204734-14061-1-git-send-email-vapier@gentoo.org> X-Mailer: git-send-email 1.6.5.rc1 In-Reply-To: <4AB22CAB.1080905@ru.mvista.com> References: <4AB22CAB.1080905@ru.mvista.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2345 Lines: 61 From: Sonic Zhang Add some helpful notes about how the driver works around different anomalies that exist in the on-chip host controller. Signed-off-by: Sonic Zhang Signed-off-by: Cliff Cai Signed-off-by: Mike Frysinger --- v2 - clean up grammar pointed out by Sergei Shtylyov drivers/usb/musb/blackfin.h | 27 +++++++++++++++++++++++++++ 1 files changed, 27 insertions(+), 0 deletions(-) diff --git a/drivers/usb/musb/blackfin.h b/drivers/usb/musb/blackfin.h index a240c1e..b49a362 100644 --- a/drivers/usb/musb/blackfin.h +++ b/drivers/usb/musb/blackfin.h @@ -14,6 +14,33 @@ * Blackfin specific definitions */ +/* Anomalies notes: + * + * 05000450 - USB DMA Mode 1 Short Packet Data Corruption: + * MUSB driver is designed to transfer buffer of N * maxpacket size + * in DMA mode 1 and leave the rest of the data to the next + * transfer in DMA mode 0, so we never transmit a short packet in + * DMA mode 1. + * + * 05000463 - This anomaly doesn't affect this driver since it + * never uses L1 or L2 memory as data destination. + * + * 05000464 - This anomaly doesn't affect this driver since it + * never uses L1 or L2 memory as data source. + * + * 05000465 - The anomaly can be seen when SCLK is over 100 MHz, and there is + * no way to workaround for bulk endpoints. Since the wMaxPackSize + * of bulk is less than or equal to 512, while the fifo size of + * endpoint 5, 6, 7 is 1024, the double buffer mode is enabled + * automatically when these endpoints are used for bulk OUT. + * + * 05000466 - This anomaly doesn't affect this driver since it never mixes + * concurrent DMA and core accesses to the TX endpoint FIFOs. + * + * 05000467 - The workaround for this anomaly will introduce another + * anomaly - 05000465. + */ + #undef DUMP_FIFO_DATA #ifdef DUMP_FIFO_DATA static void dump_fifo_data(u8 *buf, u16 len) -- 1.6.5.rc1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/