kernel-5.7.0-0.rc6.20200519git642b151f45dd.1

* Tue May 19 2020 CKI@GitLab <cki-project@redhat.com> [5.7.0-0.rc6.20200519git642b151f45dd.1]
- 642b151f45dd rebase
- pwm: lpss: Fix get_state runtime-pm reference handling (Hans de Goede)
- Updated changelog for the release based on v5.7-rc6 ("CKI@GitLab")
Resolves: rhbz#

Signed-off-by: Justin M. Forbes <jforbes@fedoraproject.org>

0001-pwm-lpss-Fix-get_state-runtime-pm-reference-handling.patch

@@ -0,0 +1,100 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Hans de Goede <hdegoede@redhat.com>
+Date: Tue, 12 May 2020 00:39:24 +0200
+Subject: [PATCH] pwm: lpss: Fix get_state runtime-pm reference handling
+
+Before commit cfc4c189bc70 ("pwm: Read initial hardware state at request
+time"), a driver's get_state callback would get called once per PWM from
+pwmchip_add().
+
+pwm-lpss' runtime-pm code was relying on this, getting a runtime-pm ref for
+PWMs which are enabled at probe time from within its get_state callback,
+before enabling runtime-pm.
+
+The change to calling get_state at request time causes a number of
+problems:
+
+1. PWMs enabled at probe time may get runtime suspended before they are
+requested, causing e.g. a LCD backlight controlled by the PWM to turn off.
+
+2. When the request happens when the PWM has been runtime suspended, the
+ctrl register will read all 1 / 0xffffffff, causing get_state to store
+bogus values in the pwm_state.
+
+3. get_state was using an async pm_runtime_get() call, because it assumed
+that runtime-pm has not been enabled yet. If shortly after the request an
+apply call is made, then the pwm_lpss_is_updating() check may trigger
+because the resume triggered by the pm_runtime_get() call is not complete
+yet, so the ctrl register still reads all 1 / 0xffffffff.
+
+This commit fixes these issues by moving the initial pm_runtime_get() call
+for PWMs which are enabled at probe time to the pwm_lpss_probe() function;
+and by making get_state take a runtime-pm ref before reading the ctrl reg.
+
+BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1828927
+Fixes: cfc4c189bc70 ("pwm: Read initial hardware state at request time")
+Cc: stable@vger.kernel.org
+Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
+Signed-off-by: Hans de Goede <hdegoede@redhat.com>
+Upstream Status: https://lore.kernel.org/linux-acpi/5f15f6bc-8650-d86e-893f-0d41557c57c7@redhat.com/
+---
+ drivers/pwm/pwm-lpss.c | 15 +++++++++++----
+ 1 file changed, 11 insertions(+), 4 deletions(-)
+
+diff --git a/drivers/pwm/pwm-lpss.c b/drivers/pwm/pwm-lpss.c
+index 75bbfe5f3bc2..9d965ffe66d1 100644
+--- a/drivers/pwm/pwm-lpss.c
++++ b/drivers/pwm/pwm-lpss.c
+@@ -158,7 +158,6 @@ static int pwm_lpss_apply(struct pwm_chip *chip, struct pwm_device *pwm,
+ 	return 0;
+ }
+
+-/* This function gets called once from pwmchip_add to get the initial state */
+ static void pwm_lpss_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
+ 			       struct pwm_state *state)
+ {
+@@ -167,6 +166,8 @@ static void pwm_lpss_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
+ 	unsigned long long base_unit, freq, on_time_div;
+ 	u32 ctrl;
+
++	pm_runtime_get_sync(chip->dev);
++
+ 	base_unit_range = BIT(lpwm->info->base_unit_bits);
+
+ 	ctrl = pwm_lpss_read(pwm);
+@@ -187,8 +188,7 @@ static void pwm_lpss_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
+ 	state->polarity = PWM_POLARITY_NORMAL;
+ 	state->enabled = !!(ctrl & PWM_ENABLE);
+
+-	if (state->enabled)
+-		pm_runtime_get(chip->dev);
++	pm_runtime_put(chip->dev);
+ }
+
+ static const struct pwm_ops pwm_lpss_ops = {
+@@ -202,7 +202,8 @@ struct pwm_lpss_chip *pwm_lpss_probe(struct device *dev, struct resource *r,
+ {
+ 	struct pwm_lpss_chip *lpwm;
+ 	unsigned long c;
+-	int ret;
++	int i, ret;
++	u32 ctrl;
+
+ 	if (WARN_ON(info->npwm > MAX_PWMS))
+ 		return ERR_PTR(-ENODEV);
+@@ -232,6 +233,12 @@ struct pwm_lpss_chip *pwm_lpss_probe(struct device *dev, struct resource *r,
+ 		return ERR_PTR(ret);
+ 	}
+
++	for (i = 0; i < lpwm->info->npwm; i++) {
++		ctrl = pwm_lpss_read(&lpwm->chip.pwms[i]);
++		if (ctrl & PWM_ENABLE)
++			pm_runtime_get(dev);
++	}
++
+ 	return lpwm;
+ }
+ EXPORT_SYMBOL_GPL(pwm_lpss_probe);
+-- 
+2.26.2
+

Patchlist

@@ -73,3 +73,4 @@
 0001-arm64-allwinner-dts-a64-add-LCD-related-device-nodes.patch
 0001-e1000e-bump-up-timeout-to-wait-when-ME-un-configure-.patch
 0001-perf-cs-etm-Move-defined-of-traceid_list.patch
+0001-pwm-lpss-Fix-get_state-runtime-pm-reference-handling.patch

kernel.spec

@@ -30,7 +30,7 @@ Summary: The Linux kernel
 # For a stable, released kernel, released_kernel should be 1.
 %global released_kernel 0
 
-%global distro_build 0.rc6.1
+%global distro_build 0.rc6.20200519git642b151f45dd.1
 
 %if 0%{?fedora}
 %define secure_boot_arch x86_64
@@ -69,10 +69,10 @@ Summary: The Linux kernel
 %endif
 
 %define rpmversion 5.7.0
-%define pkgrelease 0.rc6.1
+%define pkgrelease 0.rc6.20200519git642b151f45dd.1
 
 # allow pkg_release to have configurable %%{?dist} tag
-%define specrelease 0.rc6.1%{?buildid}%{?dist}
+%define specrelease 0.rc6.20200519git642b151f45dd.1%{?buildid}%{?dist}
 
 %define pkg_release %{specrelease}
 
@@ -163,7 +163,7 @@ Summary: The Linux kernel
 # Set debugbuildsenabled to 1 for production (build separate debug kernels)
 #  and 0 for rawhide (all kernels are debug kernels).
 # See also 'make debug' and 'make release'.
-%define debugbuildsenabled 1
+%define debugbuildsenabled 0
 
 # The kernel tarball/base version
 %define kversion 5.7
@@ -564,7 +564,7 @@ BuildRequires: asciidoc
 # exact git commit you can run
 #
 # xzcat -qq ${TARBALL} | git get-tar-commit-id
-Source0: linux-5.7-rc6.tar.xz
+Source0: linux-20200519git642b151f45dd.tar.xz
 
 Source1: Makefile.rhelver
 
@@ -778,6 +778,7 @@ Patch73: 0001-drm-sun4i-sun6i_mipi_dsi-fix-horizontal-timing-calcu.patch
 Patch74: 0001-arm64-allwinner-dts-a64-add-LCD-related-device-nodes.patch
 Patch75: 0001-e1000e-bump-up-timeout-to-wait-when-ME-un-configure-.patch
 Patch76: 0001-perf-cs-etm-Move-defined-of-traceid_list.patch
+Patch77: 0001-pwm-lpss-Fix-get_state-runtime-pm-reference-handling.patch
 
 %endif
 
@@ -1273,8 +1274,8 @@ ApplyOptionalPatch()
   fi
 }
 
-%setup -q -n kernel-5.7-rc6 -c
-mv linux-5.7-rc6 linux-%{KVERREL}
+%setup -q -n kernel-20200519git642b151f45dd -c
+mv linux-20200519git642b151f45dd linux-%{KVERREL}
 
 cd linux-%{KVERREL}
 cp -a %{SOURCE1} .
@@ -1356,6 +1357,7 @@ ApplyOptionalPatch 0001-drm-sun4i-sun6i_mipi_dsi-fix-horizontal-timing-calcu.pat
 ApplyOptionalPatch 0001-arm64-allwinner-dts-a64-add-LCD-related-device-nodes.patch
 ApplyOptionalPatch 0001-e1000e-bump-up-timeout-to-wait-when-ME-un-configure-.patch
 ApplyOptionalPatch 0001-perf-cs-etm-Move-defined-of-traceid_list.patch
+ApplyOptionalPatch 0001-pwm-lpss-Fix-get_state-runtime-pm-reference-handling.patch
 
 %endif
 
@@ -2764,6 +2766,11 @@ fi
 #
 #
 %changelog
+* Tue May 19 2020 CKI@GitLab <cki-project@redhat.com> [5.7.0-0.rc6.20200519git642b151f45dd.1]
+- 642b151f45dd rebase
+- pwm: lpss: Fix get_state runtime-pm reference handling (Hans de Goede)
+- Updated changelog for the release based on v5.7-rc6 ("CKI@GitLab")
+
 * Mon May 18 2020 CKI@GitLab <cki-project@redhat.com> [5.7.0-0.rc6.1]
 - v5.7-rc6 rebase
 - Updated changelog for the release based on 3d1c1e5931ce ("CKI@GitLab")

sources

@@ -1,3 +1,3 @@
-SHA512 (linux-5.7-rc6.tar.xz) = d21840e703ddbabd3ceda552c04808fc0239a850135b18400e1c5f46d1d92109028ce191df9927f21cb660e97ee5c7026cc6b3813d793eb856a81738b9376af7
-SHA512 (kernel-abi-whitelists-5.7.0-0.rc6.1.tar.bz2) = 7ca35d40b774ebb45b297085c8ddf00651ee6d02b08e32ac3e159562fc8fdb1e04b600e1743f7a6f976d7f739f223b8c4a48f3850e4e2ea8260cb77a0da37dac
-SHA512 (kernel-kabi-dw-5.7.0-0.rc6.1.tar.bz2) = 1ba26e33a7cee13ba8cd5967fcce2aea07da0cc213d587ddba10c558fcc6a7de4972efe6f32e3d2b3e3a949db8b425eb7aad0ba4d5db32da965d79b0029ed528
+SHA512 (linux-20200519git642b151f45dd.tar.xz) = e4710e40f931d6ca21e7f8f77c091df48c008d67b0a39a03d074edcbce72014ffc592da799d91a3e1b878c00167a3cbb9b9331223ab1b3405e63ddc5708a30a1
+SHA512 (kernel-abi-whitelists-5.7.0-0.rc6.20200519git642b151f45dd.1.tar.bz2) = 78633c9dfaff23aad3bc36056b4d20e9e797583107ab6a5670fede003656ed4f0fc53031ffe05ae79a493508db7c04946f2495451f6e363609332eba75ed56f6
+SHA512 (kernel-kabi-dw-5.7.0-0.rc6.20200519git642b151f45dd.1.tar.bz2) = 7cc0a9b5c1240b95a25b634f43878360655e7aa92bd80c576c0d2df598ad8fe352f01c7318eb1b0be3749378417207e808f509a4fe77bcd9152d6261621801b3