kernel/linux.git/drivers/gpu/host1x/channel.c, branch v6.12.80

gpu: host1x: Stop CDMA before suspending

2023-10-11T20:52:44+00:00

Before going into suspend, wait all CDMA to go idle and stop it. This will ensure no channel is still active while we enter suspend, and ensures the driver doesn't think that CDMA is still active when coming back from suspend (as HW state has been reset). Signed-off-by: Mikko Perttunen Signed-off-by: Thierry Reding Link: https://patchwork.freedesktop.org/patch/msgid/20230901111510.663401-2-cyndis@kapsi.fi

gpu: host1x: Add locking in channel allocation

2023-10-11T20:52:43+00:00

Add locking around channel allocation to avoid race conditions. Signed-off-by: Mikko Perttunen Signed-off-by: Thierry Reding Link: https://patchwork.freedesktop.org/patch/msgid/20230901111510.663401-1-cyndis@kapsi.fi

gpu: host1x: Use the bitmap API to allocate bitmaps

2022-07-08T15:38:34+00:00

Use bitmap_zalloc()/bitmap_free() instead of hand-writing them. It is less verbose and it improves the semantic. While at it, remove a useless bitmap_zero() call. The bitmap is already zero'ed when allocated. Signed-off-by: Christophe JAILLET Signed-off-by: Thierry Reding

gpu: host1x: Add host1x_channel_stop()

2021-12-16T13:07:07+00:00

Add host1x_channel_stop() which waits till channel becomes idle and then stops the channel hardware. This is needed for supporting suspend/resume by host1x drivers since the hardware state is lost after power-gating, thus the channel needs to be stopped before client enters into suspend. Tested-by: Peter Geis # Ouya T30 Tested-by: Paul Fertser # PAZ00 T20 Tested-by: Nicolas Chauvet # PAZ00 T20 and TK1 T124 Tested-by: Matt Merhar # Ouya T30 Signed-off-by: Dmitry Osipenko Signed-off-by: Thierry Reding

gpu: host1x: Request channels for clients, not devices

2019-10-28T10:18:33+00:00

A struct device doesn't carry much information that a channel might be interested in, but the client very much does. Request channels for the clients rather than their parent devices and store a pointer to them in order to have that information available when needed. Signed-off-by: Thierry Reding

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201

2019-05-30T18:29:52+00:00

Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms and conditions of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not see http www gnu org licenses extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 228 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Allison Randal Reviewed-by: Steve Winslow Reviewed-by: Richard Fontana Reviewed-by: Alexios Zavras Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190528171438.107155473@linutronix.de Signed-off-by: Greg Kroah-Hartman

gpu: host1x: Fix incorrect comment for channel_request

2017-10-20T12:19:52+00:00

This function actually doesn't sleep in the version that was merged. Signed-off-by: Mikko Perttunen Reviewed-by: Dmitry Osipenko Signed-off-by: Thierry Reding

gpu: host1x: Refactor channel allocation code

2017-06-15T12:25:38+00:00

This is largely a rewrite of the Host1x channel allocation code, bringing several changes: - The previous code could deadlock due to an interaction between the 'reflock' mutex and CDMA timeout handling. This gets rid of the mutex. - Support for more than 32 channels, required for Tegra186 - General refactoring, including better encapsulation of channel ownership handling into channel.c Signed-off-by: Mikko Perttunen Reviewed-by: Dmitry Osipenko Tested-by: Dmitry Osipenko Signed-off-by: Thierry Reding

gpu: host1x: channel: Use correct type

2016-06-23T09:59:26+00:00

find_first_zero_bit() returns an unsigned long, so make the local variable that stores the result the same type for consistency. Signed-off-by: Thierry Reding

gpu: host1x: Consistently use unsigned int for counts

2016-06-23T09:59:23+00:00

The number of channels, syncpoints, bases and mlocks can never be negative, so use unsigned int instead of int. Also make loop variables the same type for consistency. Signed-off-by: Thierry Reding