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/*
* Copyright © 2018 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "igt_psr.h"
#include "igt_sysfs.h"
#include <errno.h>
static bool psr_active_check(int debugfs_fd, enum psr_mode mode)
{
char buf[PSR_STATUS_MAX_LEN];
const char *state = mode == PSR_MODE_1 ? "SRDENT" : "DEEP_SLEEP";
igt_debugfs_simple_read(debugfs_fd, "i915_edp_psr_status", buf,
sizeof(buf));
return strstr(buf, state);
}
static inline const char *psr_active_state_get(enum psr_mode mode)
{
return mode == PSR_MODE_1 ? "SRDENT" : "DEEP_SLEEP";
}
/*
* For PSR1, we wait until PSR is active. We wait until DEEP_SLEEP for PSR2.
*/
bool psr_wait_entry(int debugfs_fd, enum psr_mode mode)
{
return igt_wait(psr_active_check(debugfs_fd, mode), 500, 20);
}
bool psr_wait_update(int debugfs_fd, enum psr_mode mode)
{
return igt_wait(!psr_active_check(debugfs_fd, mode), 40, 10);
}
static ssize_t psr_write(int debugfs_fd, const char *buf)
{
return igt_sysfs_write(debugfs_fd, "i915_edp_psr_debug", buf,
strlen(buf));
}
static int has_psr_debugfs(int debugfs_fd)
{
int ret;
/*
* Check if new PSR debugfs api is usable by writing an invalid value.
* Legacy mode will return OK here, debugfs api will return -EINVAL.
* -ENODEV is returned when PSR is unavailable.
*/
ret = psr_write(debugfs_fd, "0xf");
if (ret == -EINVAL)
return 0;
else if (ret < 0)
return ret;
/* legacy debugfs api, we enabled irqs by writing, disable them. */
psr_write(debugfs_fd, "0");
return -EINVAL;
}
static bool psr_modparam_set(int val)
{
static int oldval = -1;
igt_set_module_param_int("enable_psr", val);
if (val == oldval)
return false;
oldval = val;
return true;
}
static int psr_restore_debugfs_fd = -1;
static void restore_psr_debugfs(int sig)
{
psr_write(psr_restore_debugfs_fd, "0");
}
static bool psr_set(int debugfs_fd, bool enable)
{
int ret;
ret = has_psr_debugfs(debugfs_fd);
if (ret == -ENODEV) {
igt_skip_on_f(enable, "PSR not available\n");
return false;
}
if (ret == -EINVAL) {
ret = psr_modparam_set(enable);
} else {
ret = psr_write(debugfs_fd, enable ? "0x3" : "0x1");
igt_assert(ret > 0);
}
/* Restore original value on exit */
if (psr_restore_debugfs_fd == -1) {
psr_restore_debugfs_fd = dup(debugfs_fd);
igt_assert(psr_restore_debugfs_fd >= 0);
igt_install_exit_handler(restore_psr_debugfs);
}
return ret;
}
bool psr_enable(int debugfs_fd)
{
return psr_set(debugfs_fd, true);
}
bool psr_disable(int debugfs_fd)
{
return psr_set(debugfs_fd, false);
}
bool psr_sink_support(int debugfs_fd)
{
char buf[PSR_STATUS_MAX_LEN];
int ret;
ret = igt_debugfs_simple_read(debugfs_fd, "i915_edp_psr_status", buf,
sizeof(buf));
return ret > 0 && (strstr(buf, "Sink_Support: yes\n") ||
strstr(buf, "Sink support: yes"));
}
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