tests: add pm_lpsp

QA has asked me "How can we make sure LPSP is working?". Now, instead
of writing big paragraphs, I can just answer "make sure pm_lpsp
works".

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>

tests/.gitignore

@@ -109,6 +109,7 @@ kms_flip
 kms_pipe_crc_basic
 kms_render
 kms_setmode
+pm_lpsp
 pm_pc8
 pm_psr
 pm_rc6_residency

tests/Makefile.sources

@@ -56,6 +56,7 @@ TESTS_progs_M = \
 	kms_pipe_crc_basic \
 	kms_render \
 	kms_setmode \
+	pm_lpsp \
 	pm_pc8 \
 	prime_self_import \
 	template \

tests/pm_lpsp.c

@@ -0,0 +1,275 @@
+/*
+ * Copyright © 2013 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.
+ *
+ * Author: Paulo Zanoni <paulo.r.zanoni@intel.com>
+ *
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "drmtest.h"
+#include "igt_kms.h"
+
+/* We know that if we don't enable audio runtime PM, snd_hda_intel will never
+ * release its power well refcount, and we'll never reach the LPSP sate. OTOH
+ * there's no guarantee that it will release the power well if we enable runtime
+ * PM, but at least we can try.  We don't have any assertions since the user may
+ * not even have snd_hda_intel loaded, which is not a problem. */
+static void disable_audio_runtime_pm(void)
+{
+	int fd;
+
+	fd = open("/sys/module/snd_hda_intel/parameters/power_save", O_WRONLY);
+	if (fd >= 0) {
+		write(fd, "1\n", 2);
+		close(fd);
+	}
+	fd = open("/sys/bus/pci/devices/0000:00:03.0/power/control", O_WRONLY);
+	if (fd >= 0) {
+		write(fd, "auto\n", 5);
+		close(fd);
+	}
+	/* Give some time for it to react. */
+	sleep(1);
+}
+
+static bool supports_lpsp(uint32_t devid)
+{
+	return IS_HASWELL(devid) || IS_BROADWELL(devid);
+}
+
+static bool lpsp_is_enabled(int drm_fd)
+{
+	uint32_t val;
+
+	val = INREG(HSW_PWR_WELL_CTL2);
+	return !(val & HSW_PWR_WELL_STATE_ENABLED);
+}
+
+static void disable_all_screens(int drm_fd, drmModeResPtr drm_resources)
+{
+	int i, rc;
+
+	for (i = 0; i < drm_resources->count_crtcs; i++) {
+		rc = drmModeSetCrtc(drm_fd, drm_resources->crtcs[i], -1, 0, 0,
+				    NULL, 0, NULL);
+		igt_assert(rc == 0);
+	}
+}
+
+/* The LPSP mode is all about an enabled pipe, but we expect to also be in the
+ * low power mode when no pipes are enabled, so do this check anyway. */
+static void screens_disabled_subtest(int drm_fd, drmModeResPtr drm_res)
+{
+	disable_all_screens(drm_fd, drm_res);
+	igt_assert(lpsp_is_enabled(drm_fd));
+}
+
+static uint32_t create_fb(int drm_fd, int width, int height)
+{
+	struct kmstest_fb fb;
+	cairo_t *cr;
+	uint32_t buffer_id;
+
+	buffer_id = kmstest_create_fb(drm_fd, width, height, 32, 24, false,
+				      &fb);
+	cr = kmstest_get_cairo_ctx(drm_fd, &fb);
+	kmstest_paint_test_pattern(cr, width, height);
+	return buffer_id;
+}
+
+static void edp_subtest(int drm_fd, drmModeResPtr drm_res,
+			drmModeConnectorPtr *drm_connectors, uint32_t devid,
+			bool use_panel_fitter)
+{
+	int i, rc;
+	uint32_t connector_id = 0, crtc_id = 0, buffer_id = 0;
+	drmModeModeInfoPtr mode = NULL;
+	drmModeModeInfo std_1024_mode = {
+		.clock = 65000,
+		.hdisplay = 1024,
+		.hsync_start = 1048,
+		.hsync_end = 1184,
+		.htotal = 1344,
+		.vtotal = 806,
+		.hskew = 0,
+		.vdisplay = 768,
+		.vsync_start = 771,
+		.vsync_end = 777,
+		.vtotal = 806,
+		.vscan = 0,
+		.vrefresh = 60,
+		.flags = 0xA,
+		.type = 0x40,
+		.name = "Custom 1024x768",
+	};
+
+	disable_all_screens(drm_fd, drm_res);
+
+	for (i = 0; i < drm_res->count_connectors; i++) {
+		drmModeConnectorPtr c = drm_connectors[i];
+
+		if (c->connector_type != DRM_MODE_CONNECTOR_eDP)
+			continue;
+		if (c->connection != DRM_MODE_CONNECTED)
+			continue;
+
+		if (!use_panel_fitter && c->count_modes) {
+			connector_id = c->connector_id;
+			mode = &c->modes[0];
+			break;
+		}
+		if (use_panel_fitter) {
+			connector_id = c->connector_id;
+
+			/* This is one of the modes Xorg creates for panels, so
+			 * it should work just fine. Notice that Gens that
+			 * support LPSP are too new for panels with native
+			 * 1024x768 resolution, so this should force the panel
+			 * fitter. */
+			igt_assert(c->count_modes &&
+				   c->modes[0].hdisplay > 1024);
+			igt_assert(c->count_modes &&
+				   c->modes[0].vdisplay > 768);
+			mode = &std_1024_mode;
+			break;
+		}
+	}
+	igt_require(connector_id);
+
+	crtc_id = drm_res->crtcs[0];
+	buffer_id = create_fb(drm_fd, mode->hdisplay, mode->vdisplay);
+
+	igt_assert(crtc_id);
+	igt_assert(buffer_id);
+	igt_assert(connector_id);
+	igt_assert(mode);
+
+	rc = drmModeSetCrtc(drm_fd, crtc_id, buffer_id, 0, 0, &connector_id, 1,
+			    mode);
+	igt_assert(rc == 0);
+
+	if (use_panel_fitter) {
+		if (IS_HASWELL(devid))
+			igt_assert(!lpsp_is_enabled(drm_fd));
+		else
+			igt_assert(lpsp_is_enabled(drm_fd));
+	} else {
+		igt_assert(lpsp_is_enabled(drm_fd));
+	}
+}
+
+static void non_edp_subtest(int drm_fd, drmModeResPtr drm_res,
+			    drmModeConnectorPtr *drm_connectors)
+{
+	int i, rc;
+	uint32_t connector_id = 0, crtc_id = 0, buffer_id = 0;
+	drmModeModeInfoPtr mode = NULL;
+
+	disable_all_screens(drm_fd, drm_res);
+
+	for (i = 0; i < drm_res->count_connectors; i++) {
+		drmModeConnectorPtr c = drm_connectors[i];
+
+		if (c->connector_type == DRM_MODE_CONNECTOR_eDP)
+			continue;
+		if (c->connection != DRM_MODE_CONNECTED)
+			continue;
+
+		if (c->count_modes) {
+			connector_id = c->connector_id;
+			mode = &c->modes[0];
+			break;
+		}
+	}
+	igt_require(connector_id);
+
+	crtc_id = drm_res->crtcs[0];
+	buffer_id = create_fb(drm_fd, mode->hdisplay, mode->vdisplay);
+
+	igt_assert(crtc_id);
+	igt_assert(buffer_id);
+	igt_assert(connector_id);
+	igt_assert(mode);
+
+	rc = drmModeSetCrtc(drm_fd, crtc_id, buffer_id, 0, 0, &connector_id, 1,
+			    mode);
+	igt_assert(rc == 0);
+
+	igt_assert(!lpsp_is_enabled(drm_fd));
+}
+
+#define MAX_CONNECTORS 32
+
+int drm_fd;
+uint32_t devid;
+drmModeResPtr drm_res;
+drmModeConnectorPtr drm_connectors[MAX_CONNECTORS];
+
+igt_main
+{
+	igt_fixture {
+		int i;
+
+		drm_fd = drm_open_any();
+		igt_require(drm_fd >= 0);
+
+		devid = intel_get_drm_devid(drm_fd);
+
+		drm_res = drmModeGetResources(drm_fd);
+		igt_assert(drm_res->count_connectors <= MAX_CONNECTORS);
+
+		for (i = 0; i < drm_res->count_connectors; i++)
+			drm_connectors[i] = drmModeGetConnector(drm_fd,
+							drm_res->connectors[i]);
+
+		disable_audio_runtime_pm();
+
+		igt_require(supports_lpsp(devid));
+
+		intel_register_access_init(intel_get_pci_device(), 0);
+
+		igt_set_vt_graphics_mode();
+	}
+
+	igt_subtest("screens-disabled")
+		screens_disabled_subtest(drm_fd, drm_res);
+	igt_subtest("edp-native")
+		edp_subtest(drm_fd, drm_res, drm_connectors, devid, false);
+	igt_subtest("edp-panel-fitter")
+		edp_subtest(drm_fd, drm_res, drm_connectors, devid, true);
+	igt_subtest("non-edp")
+		non_edp_subtest(drm_fd, drm_res, drm_connectors);
+
+	igt_fixture {
+		int i;
+
+		intel_register_access_fini();
+		for (i = 0; i < drm_res->count_connectors; i++)
+			drmModeFreeConnector(drm_connectors[i]);
+		drmModeFreeResources(drm_res);
+		close(drm_fd);
+	}
+}