/* * nv_tco: TCO timer driver for nVidia chipsets. * * (c) Copyright 2005 Google Inc., All Rights Reserved. * * Supported Chipsets: * - MCP51/MCP55 * * (c) Copyright 2000 kernel concepts , All Rights * Reserved. * http://www.kernelconcepts.de * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * Neither kernel concepts nor Nils Faerber admit liability nor provide * warranty for any of this software. This material is provided * "AS-IS" and at no charge. * * (c) Copyright 2000 kernel concepts * developed for * Jentro AG, Haar/Munich (Germany) * * TCO timer driver for NV chipsets * based on softdog.c by Alan Cox */ /* * Some address definitions for the TCO */ #define TCO_RLD(base) ((base) + 0x00) /* TCO Timer Reload and Current Value */ #define TCO_TMR(base) ((base) + 0x01) /* TCO Timer Initial Value */ #define TCO_STS(base) ((base) + 0x04) /* TCO Status Register */ /* * TCO Boot Status bit: set on TCO reset, reset by software or standby * power-good (survives reboots), unfortunately this bit is never * set. */ # define TCO_STS_BOOT_STS (1 << 9) /* * first and 2nd timeout status bits, these also survive a warm boot, * and they work, so we use them. */ # define TCO_STS_TCO_INT_STS (1 << 1) # define TCO_STS_TCO2TO_STS (1 << 10) # define TCO_STS_RESET (TCO_STS_BOOT_STS | TCO_STS_TCO2TO_STS | \ TCO_STS_TCO_INT_STS) #define TCO_CNT(base) ((base) + 0x08) /* TCO Control Register */ # define TCO_CNT_TCOHALT (1 << 12) #define MCP51_SMBUS_SETUP_B 0xe8 # define MCP51_SMBUS_SETUP_B_TCO_REBOOT (1 << 25) /* * The SMI_EN register is at the base io address + 0x04, * while TCOBASE is + 0x40. */ #define MCP51_SMI_EN(base) ((base) - 0x40 + 0x04) # define MCP51_SMI_EN_TCO ((1 << 4) | (1 << 5)) e-remove&id=ae4a3e028bb8b59e7cfeb0cc9ef03d885182ce8b'>commitdiff
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authorTony Lindgren <tony@atomide.com>2017-01-19 08:49:07 -0800
committerVinod Koul <vinod.koul@intel.com>2017-01-25 11:29:11 +0530
commitae4a3e028bb8b59e7cfeb0cc9ef03d885182ce8b (patch)
tree139fc7e29f97d6bb6c4dca2a97be2dc3f824bd51 /sound/soc/atmel
parent49def1853334396f948dcb4cedb9347abb318df5 (diff)
dmaengine: cppi41: Fix runtime PM timeouts with USB mass storage
Commit fdea2d09b997 ("dmaengine: cppi41: Add basic PM runtime support") added runtime PM support for cppi41, but had corner case issues. Some of the issues were fixed with commit 098de42ad670 ("dmaengine: cppi41: Fix unpaired pm runtime when only a USB hub is connected"). That fix however caused a new regression where we can get error -115 messages with USB on BeagleBone when connecting a USB mass storage device to a hub. This is because when connecting a USB mass storage device to a hub, the initial DMA transfers can take over 200ms to complete and cppi41 autosuspend delay times out. To fix the issue, we want to implement refcounting for chan_busy array that contains the active dma transfers. Increasing the autosuspend delay won't help as that the delay could be potentially seconds, and it's best to let the USB subsystem to deal with the timeouts on errors. The earlier attempt for runtime PM was buggy as the pm_runtime_get/put() calls could get unpaired easily as they did not follow the state of the chan_busy array as described in commit 098de42ad670 ("dmaengine: cppi41: Fix unpaired pm runtime when only a USB hub is connected". Let's fix the issue by adding pm_runtime_get() to where a new transfer is added to the chan_busy array, and calls to pm_runtime_put() where chan_busy array entry is cleared. This prevents any autosuspend timeouts from happening while dma transfers are active. Fixes: 098de42ad670 ("dmaengine: cppi41: Fix unpaired pm runtime when only a USB hub is connected") Fixes: fdea2d09b997 ("dmaengine: cppi41: Add basic PM runtime support") Cc: Andy Shevchenko <andy.shevchenko@gmail.com> Cc: Bin Liu <b-liu@ti.com> Cc: Grygorii Strashko <grygorii.strashko@ti.com> Cc: Kevin Hilman <khilman@baylibre.com> Cc: Patrick Titiano <ptitiano@baylibre.com> Cc: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> Signed-off-by: Tony Lindgren <tony@atomide.com> Tested-by: Bin Liu <b-liu@ti.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'sound/soc/atmel')