linux-kernel - [PATCH 0/4] usb: musb: tusb6010

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Date:   Wed, 3 May 2017 13:56:41 +0300
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     <b-liu@...com>, <tony@...mide.com>, <gregkh@...uxfoundation.org>
CC:     <linux-usb@...r.kernel.org>, <linux-omap@...r.kernel.org>,
        <balbi@...nel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 0/4] usb: musb: tusb6010_omap: Convert to DMAengine

Hi,

With port_window support implemented in DMAengine and the sDMA DMAengine driver,
the tusb6010_omap driver can be converted away from the custom legacy omap-dma
API to generic DMAengine.

The first two patch is to prepare the tusb6010_omap driver for the conversion.
The third one adds the needed entries for the dma_slave_map so we can request
the DMA channels. This can be reverted when the stack is converted to DT.

The last patch does the main work to move the driver to DMAengine API.

I have tested the set on top of next-20170503 on Nokia n810 with nfsroot using
CDC Ethernet (g_cdc) and copying files with scp to/form my host.

To force that the DMA is actually used I have:
diff --git a/drivers/usb/musb/tusb6010_omap.c b/drivers/usb/musb/tusb6010_omap.c
index 05aefcad40b5..a5fc2a6bdad3 100644
--- a/drivers/usb/musb/tusb6010_omap.c
+++ b/drivers/usb/musb/tusb6010_omap.c
@@ -216,8 +216,8 @@ static int tusb_omap_dma_program(struct dma_channel *channel, u16 packet_sz,
 	 * use a timer for the callback, but it is unsafe as the XFR_SIZE
 	 * register is corrupt, and we won't know if the DMA worked.
 	 */
-	if (dma_addr & 0x2)
-		return false;
+// 	if (dma_addr & 0x2)
+// 		return false;

 	/*
 	 * Because of HW issue #10, it seems like mixing sync DMA and async

Since this condition will almost all the time was true - effectively disabling
the DMA use.

Regards.
Peter
---
Peter Ujfalusi (4):
  usb: musb: tusb6010_omap: Create new struct for DMA data/parameters
  usb: musb: tusb6010_omap: Allocate DMA channels upfront
  ARM: OMAP2+: DMA: Add slave map entries for 24xx external request
    lines
  usb: musb: tusb6010_omap: Convert to DMAengine API

 arch/arm/mach-omap2/dma.c        |  24 +++
 drivers/usb/musb/tusb6010_omap.c | 342 ++++++++++++++++++---------------------
 2 files changed, 177 insertions(+), 189 deletions(-)

-- 
2.12.2