From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 988034E1AD; Tue, 23 Jan 2024 01:00:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705971618; cv=none; b=Rm//EFaFwLOisYcOG4nz3BKpAxQj6FEuc3kaCh/xXwtgE3p4915uyYcxLbgig0zHpOl02aRJO80oeqJkbSeyeUUaArlBOUS1eizVPdsm5ixrXlmHDaQ48iIZf8lG8obUuKyOMTzjxFsrV/hejQQPaGrFZJe29qDLCIA0wCV2xes= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705971618; c=relaxed/simple; bh=laF12l0+J5Um/+L+czPVenIfraqZQFsOsq9fo2k7sF0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=OTZN5btPHMq1adlZg2s4KA/IYNAePvOVQiSy4O8X8YyQ2ijiifd1zIwsxAJM99gFKll5Vsc3g0Gkn9yBYHHzsBFORzpKluYjWemqGxfRK4pPIbQwyrb15Kb6sCPsplMdX9UxNha52TGXg51N1/FozHSia3I9xCl2vUAfhphUtWU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=W1hj01uq; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="W1hj01uq" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 40321C433C7; Tue, 23 Jan 2024 01:00:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1705971618; bh=laF12l0+J5Um/+L+czPVenIfraqZQFsOsq9fo2k7sF0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=W1hj01uqKpwmbLYtu6UmpJrPvIMjZMtcZ0QnNI3IoBvtdk9dYjjBPPIT8b5J44HUS awCC8CQW9bNwWXgKg+1giq+3SI4L/lFHrY6uruB7/jmp6KbyWtH3GE/R9INydGp/Co aONyUeeGWhLRR/y07RAP1/NPgaC+K0VZOJurdPAQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Frank Li Subject: [PATCH 6.1 266/417] usb: cdns3: Fix uvc fail when DMA cross 4k boundery since sg enabled Date: Mon, 22 Jan 2024 15:57:14 -0800 Message-ID: <20240122235801.078553326@linuxfoundation.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240122235751.480367507@linuxfoundation.org> References: <20240122235751.480367507@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Frank Li commit 40c304109e866a7dc123661a5c8ca72f6b5e14e0 upstream. Supposed DMA cross 4k bounder problem should be fixed at DEV_VER_V2, but still met problem when do ISO transfer if sg enabled. Data pattern likes below when sg enabled, package size is 1k and mult is 2 [UVC Header(8B) ] [data(3k - 8)] ... The received data at offset 0xd000 will get 0xc000 data, len 0x70. Error happen position as below pattern: 0xd000: wrong 0xe000: wrong 0xf000: correct 0x10000: wrong 0x11000: wrong 0x12000: correct ... To avoid DMA cross 4k bounder at ISO transfer, reduce burst len according to start DMA address's alignment. Cc: Fixes: 7733f6c32e36 ("usb: cdns3: Add Cadence USB3 DRD Driver") Signed-off-by: Frank Li Link: https://lore.kernel.org/r/20231224153816.1664687-4-Frank.Li@nxp.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/cdns3/cdns3-gadget.c | 32 +++++++++++++++++++++++++++++++- 1 file changed, 31 insertions(+), 1 deletion(-) --- a/drivers/usb/cdns3/cdns3-gadget.c +++ b/drivers/usb/cdns3/cdns3-gadget.c @@ -1118,6 +1118,7 @@ static int cdns3_ep_run_transfer(struct u32 togle_pcs = 1; int sg_iter = 0; int num_trb_req; + int trb_burst; int num_trb; int address; u32 control; @@ -1240,7 +1241,36 @@ static int cdns3_ep_run_transfer(struct total_tdl += DIV_ROUND_UP(length, priv_ep->endpoint.maxpacket); - trb->length |= cpu_to_le32(TRB_BURST_LEN(priv_ep->trb_burst_size) | + trb_burst = priv_ep->trb_burst_size; + + /* + * Supposed DMA cross 4k bounder problem should be fixed at DEV_VER_V2, but still + * met problem when do ISO transfer if sg enabled. + * + * Data pattern likes below when sg enabled, package size is 1k and mult is 2 + * [UVC Header(8B) ] [data(3k - 8)] ... + * + * The received data at offset 0xd000 will get 0xc000 data, len 0x70. Error happen + * as below pattern: + * 0xd000: wrong + * 0xe000: wrong + * 0xf000: correct + * 0x10000: wrong + * 0x11000: wrong + * 0x12000: correct + * ... + * + * But it is still unclear about why error have not happen below 0xd000, it should + * cross 4k bounder. But anyway, the below code can fix this problem. + * + * To avoid DMA cross 4k bounder at ISO transfer, reduce burst len according to 16. + */ + if (priv_ep->type == USB_ENDPOINT_XFER_ISOC && priv_dev->dev_ver <= DEV_VER_V2) + if (ALIGN_DOWN(trb->buffer, SZ_4K) != + ALIGN_DOWN(trb->buffer + length, SZ_4K)) + trb_burst = 16; + + trb->length |= cpu_to_le32(TRB_BURST_LEN(trb_burst) | TRB_LEN(length)); pcs = priv_ep->pcs ? TRB_CYCLE : 0;