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path: root/drivers/gpu/host1x/syncpt.c
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2016-11-11gpu: host1x: Add locking to syncptArto Merilainen1-4/+19
Currently syncpoints are not locked by mutex and this causes races if we are aggressively freeing and allocating syncpoints. This patch adds missing mutex protection to syncpoint structures. Signed-off-by: Arto Merilainen <amerilainen@nvidia.com> Reviewed-by: Shridhar Rasal <srasal@nvidia.com> Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com> [treding@nvidia.com: use better label names, don't reset local variable] Signed-off-by: Thierry Reding <treding@nvidia.com>
2016-06-23gpu: host1x: Remove useless local variableThierry Reding1-4/+2
The local 'val' variable is used to store a value and immediately return it to its caller, and hence serves no purpose. Just drop it and directly return the value. Signed-off-by: Thierry Reding <treding@nvidia.com>
2016-06-23gpu: host1x: Whitespace cleanup for readabilityThierry Reding1-2/+22
Insert a number of blank lines in places where they increase readability of the code. Also collapse various variable declarations to shorten some functions and finally rewrite some code for readability. Signed-off-by: Thierry Reding <treding@nvidia.com>
2016-06-23gpu: host1x: Fix a couple of checkpatch warningsThierry Reding1-1/+4
Fix a couple of occurrences where no blank line was used to separate variable declarations from code or where block comments were wrongly formatted. Signed-off-by: Thierry Reding <treding@nvidia.com>
2016-06-23gpu: host1x: syncpt: Use kcalloc() instead of kzalloc()Thierry Reding1-2/+2
Use kcalloc() to allocate arrays rather than passing the product of the size per element by the number of elements to kzalloc(). Signed-off-by: Thierry Reding <treding@nvidia.com>
2016-06-23gpu: host1x: Use unsigned int consistently for IDsThierry Reding1-3/+3
IDs can never be negative so use unsigned int. In some instances an explicitly sized type (such as u32) was used for no particular reason, so turn those into unsigned int as well for consistency. Signed-off-by: Thierry Reding <treding@nvidia.com>
2016-06-23gpu: host1x: Consistently use unsigned int for countsThierry Reding1-7/+8
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 <treding@nvidia.com>
2015-04-02gpu: host1x: Export host1x_syncpt_read()Thierry Reding1-0/+6
This function is used to read the current value of the syncpt and is useful in situations where drivers don't schedule work and wait for the syncpoint to increment. One particular use-case is using the syncpoint as a VBLANK counter. Signed-off-by: Thierry Reding <treding@nvidia.com>
2014-04-04gpu: host1x: export host1x_syncpt_incr_max() functionBryan Wu1-0/+1
Tegra V4L2 camera driver needs this function to do frame capture. Signed-off-by: Bryan Wu <pengw@nvidia.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
2013-12-19gpu: host1x: Export public APIThierry Reding1-0/+9
Make the public API symbols visible so that depending drivers can be built as a module. Signed-off-by: Thierry Reding <treding@nvidia.com>
2013-10-31gpu: host1x: Add syncpoint base supportArto Merilainen1-2/+53
This patch adds support for hardware syncpoint bases. This creates a simple mechanism to stall the command FIFO until an operation is completed. Signed-off-by: Arto Merilainen <amerilainen@nvidia.com> Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
2013-10-31gpu: host1x: Add 'flags' field to syncpt requestArto Merilainen1-7/+11
Functions host1x_syncpt_request() and _host1x_syncpt_alloc() have been taking a separate boolean flag ('client_managed') for indicating if the syncpoint value should be tracked by the host1x driver. This patch converts the field into generic 'flags' field so that we can easily add more information while requesting a syncpoint. Clients are adapted to use the new interface accordingly. Signed-off-by: Arto Merilainen <amerilainen@nvidia.com> Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
2013-10-31gpu: host1x: Expose syncpt and channel functionalityThierry Reding1-0/+19
Expose the buffer objects, syncpoint and channel functionality in the public public header so that drivers can use them. Signed-off-by: Thierry Reding <treding@nvidia.com>
2013-06-22gpu: host1x: Rework CPU syncpoint incrementArto Merilainen1-13/+2
This patch merges host1x_syncpt_cpu_incr to host1x_syncpt_incr() as they are in practise doing the same thing. host1x_syncpt_incr() is also modified to return error codes. User space interface is modified accordingly to pass return values. Signed-off-by: Arto Merilainen <amerilainen@nvidia.com> Acked-By: Terje Bergstrom <tbergstrom@nvidia.com> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-06-22gpu: host1x: Fix client_managed typeArto Merilainen1-4/+4
client_managed field in syncpoint structure was defined as an integer. The field holds, however, only a boolean value. This patch modifies the type to boolean. Signed-off-by: Arto Merilainen <amerilainen@nvidia.com> Acked-By: Terje Bergstrom <tbergstrom@nvidia.com> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-06-22gpu: host1x: Fix memory access in syncpt requestArto Merilainen1-1/+2
This patch fixes a bad memory access in syncpoint request code. If no syncpoints were available, the code accessed unreserved memory area causing unexpected behaviour. Signed-off-by: Arto Merilainen <amerilainen@nvidia.com> Acked-By: Terje Bergstrom <tbergstrom@nvidia.com> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
2013-04-22gpu: host1x: Add debug supportTerje Bergstrom1-0/+5
Add support for host1x debugging. Adds debugfs entries, and dumps channel state to UART in case of stuck job. Signed-off-by: Arto Merilainen <amerilainen@nvidia.com> Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com> Reviewed-by: Thierry Reding <thierry.reding@avionic-design.de> Tested-by: Thierry Reding <thierry.reding@avionic-design.de> Tested-by: Erik Faye-Lund <kusmabite@gmail.com> Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-04-22gpu: host1x: Add channel supportTerje Bergstrom1-0/+11
Add support for host1x client modules, and host1x channels to submit work to the clients. Signed-off-by: Arto Merilainen <amerilainen@nvidia.com> Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com> Reviewed-by: Thierry Reding <thierry.reding@avionic-design.de> Tested-by: Thierry Reding <thierry.reding@avionic-design.de> Tested-by: Erik Faye-Lund <kusmabite@gmail.com> Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-04-22gpu: host1x: Add syncpoint wait and interruptsTerje Bergstrom1-0/+159
Add support for sync point interrupts, and sync point wait. Sync point wait used interrupts for unblocking wait. Signed-off-by: Arto Merilainen <amerilainen@nvidia.com> Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com> Reviewed-by: Thierry Reding <thierry.reding@avionic-design.de> Tested-by: Thierry Reding <thierry.reding@avionic-design.de> Tested-by: Erik Faye-Lund <kusmabite@gmail.com> Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-04-22gpu: host1x: Add host1x driverTerje Bergstrom1-0/+212
Add host1x, the driver for host1x and its client unit 2D. The Tegra host1x module is the DMA engine for register access to Tegra's graphics- and multimedia-related modules. The modules served by host1x are referred to as clients. host1x includes some other functionality, such as synchronization. Signed-off-by: Arto Merilainen <amerilainen@nvidia.com> Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com> Reviewed-by: Thierry Reding <thierry.reding@avionic-design.de> Tested-by: Thierry Reding <thierry.reding@avionic-design.de> Tested-by: Erik Faye-Lund <kusmabite@gmail.com> Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
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