/* * V4L2 clock service * * Copyright (C) 2012-2013, Guennadi Liakhovetski * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * ATTENTION: This is a temporary API and it shall be replaced by the generic * clock API, when the latter becomes widely available. */ #ifndef MEDIA_V4L2_CLK_H #define MEDIA_V4L2_CLK_H #include #include #include #include struct module; struct device; struct clk; struct v4l2_clk { struct list_head list; const struct v4l2_clk_ops *ops; const char *dev_id; int enable; struct mutex lock; /* Protect the enable count */ atomic_t use_count; struct clk *clk; void *priv; }; struct v4l2_clk_ops { struct module *owner; int (*enable)(struct v4l2_clk *clk); void (*disable)(struct v4l2_clk *clk); unsigned long (*get_rate)(struct v4l2_clk *clk); int (*set_rate)(struct v4l2_clk *clk, unsigned long); }; struct v4l2_clk *v4l2_clk_register(const struct v4l2_clk_ops *ops, const char *dev_name, void *priv); void v4l2_clk_unregister(struct v4l2_clk *clk); struct v4l2_clk *v4l2_clk_get(struct device *dev, const char *id); void v4l2_clk_put(struct v4l2_clk *clk); int v4l2_clk_enable(struct v4l2_clk *clk); void v4l2_clk_disable(struct v4l2_clk *clk); unsigned long v4l2_clk_get_rate(struct v4l2_clk *clk); int v4l2_clk_set_rate(struct v4l2_clk *clk, unsigned long rate); struct module; struct v4l2_clk *__v4l2_clk_register_fixed(const char *dev_id, unsigned long rate, struct module *owner); void v4l2_clk_unregister_fixed(struct v4l2_clk *clk); static inline struct v4l2_clk *v4l2_clk_register_fixed(const char *dev_id, unsigned long rate) { return __v4l2_clk_register_fixed(dev_id, rate, THIS_MODULE); } #define V4L2_CLK_NAME_SIZE 64 #define v4l2_clk_name_i2c(name, size, adap, client) snprintf(name, size, \ "%d-%04x", adap, client) #define v4l2_clk_name_of(name, size, of_full_name) snprintf(name, size, \ "of-%s", of_full_name) #endif e7c4da7df0a9c6aefdbc849e2bb3'/>
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authorBrian Norris <briannorris@chromium.org>2017-01-13 15:35:36 -0800
committerKalle Valo <kvalo@codeaurora.org>2017-01-20 11:46:31 +0200
commit062e008a6e83e7c4da7df0a9c6aefdbc849e2bb3 (patch)
treeb37b6044c727267396153b828e773b38c8d1fc00
parentdab38e7d251d26917935352bee605974cc46eaec (diff)
mwifiex: pcie: use posted write to wake up firmware
Depending on system factors (e.g., the PCIe link PM state), the first read to wake up the Wifi firmware can take a long time. There is no reason to use a (blocking, non-posted) read at this point, so let's just use a write instead. Write vs. read doesn't matter functionality-wise -- it's just a dummy operation. But let's make sure to re-write with the correct "ready" signature, since we check for that in other parts of the driver. This has been shown to decrease the time spent blocking in this function on RK3399. Signed-off-by: Brian Norris <briannorris@chromium.org> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
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