hw/gpio/aspeed_gpio: Fix QOM pin property

I was setting gpioV4-7 to "1110" using the QOM pin property handler and
noticed that lowering gpioV7 was inadvertently lowering gpioV4-6 too.

    (qemu) qom-set /machine/soc/gpio gpioV4 true
    (qemu) qom-set /machine/soc/gpio gpioV5 true
    (qemu) qom-set /machine/soc/gpio gpioV6 true
    (qemu) qom-get /machine/soc/gpio gpioV4
    true
    (qemu) qom-set /machine/soc/gpio gpioV7 false
    (qemu) qom-get /machine/soc/gpio gpioV4
    false

An expression in aspeed_gpio_set_pin_level was using a logical NOT
operator instead of a bitwise NOT operator:

    value &= !pin_mask;

The original author probably intended to make a bitwise NOT expression
"~", but mistakenly used a logical NOT operator "!" instead. Some
programming languages like Rust use "!" for both purposes.

Fixes: 4b7f956862dc ("hw/gpio: Add basic Aspeed GPIO model for AST2400 and
AST2500")
Signed-off-by: Peter Delevoryas <pdel@fb.com>
Message-Id: <20220502080827.244815-1-pdel@fb.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>

hw/gpio/aspeed_gpio.c

@@ -312,7 +312,7 @@ static void aspeed_gpio_set_pin_level(AspeedGPIOState *s, uint32_t set_idx,
     if (level) {
         value |= pin_mask;
     } else {
-        value &= !pin_mask;
+        value &= ~pin_mask;
     }
 
     aspeed_gpio_update(s, &s->sets[set_idx], value);

tests/qtest/aspeed_gpio-test.c

@@ -0,0 +1,87 @@
+/*
+ * QTest testcase for the Aspeed GPIO Controller.
+ *
+ * Copyright (c) Meta Platforms, Inc. and affiliates. (http://www.meta.com)
+ *
+ * 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 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 "qemu/osdep.h"
+#include "qemu/bitops.h"
+#include "qemu/timer.h"
+#include "qapi/qmp/qdict.h"
+#include "libqtest-single.h"
+
+static bool qom_get_bool(QTestState *s, const char *path, const char *property)
+{
+    QDict *r;
+    bool b;
+
+    r = qtest_qmp(s, "{ 'execute': 'qom-get', 'arguments': "
+                     "{ 'path': %s, 'property': %s } }", path, property);
+    b = qdict_get_bool(r, "return");
+    qobject_unref(r);
+
+    return b;
+}
+
+static void qom_set_bool(QTestState *s, const char *path, const char *property,
+                         bool value)
+{
+    QDict *r;
+
+    r = qtest_qmp(s, "{ 'execute': 'qom-set', 'arguments': "
+                     "{ 'path': %s, 'property': %s, 'value': %i } }",
+                     path, property, value);
+    qobject_unref(r);
+}
+
+static void test_set_colocated_pins(const void *data)
+{
+    QTestState *s = (QTestState *)data;
+
+    /*
+     * gpioV4-7 occupy bits within a single 32-bit value, so we want to make
+     * sure that modifying one doesn't affect the other.
+     */
+    qom_set_bool(s, "/machine/soc/gpio", "gpioV4", true);
+    qom_set_bool(s, "/machine/soc/gpio", "gpioV5", false);
+    qom_set_bool(s, "/machine/soc/gpio", "gpioV6", true);
+    qom_set_bool(s, "/machine/soc/gpio", "gpioV7", false);
+    g_assert(qom_get_bool(s, "/machine/soc/gpio", "gpioV4"));
+    g_assert(!qom_get_bool(s, "/machine/soc/gpio", "gpioV5"));
+    g_assert(qom_get_bool(s, "/machine/soc/gpio", "gpioV6"));
+    g_assert(!qom_get_bool(s, "/machine/soc/gpio", "gpioV7"));
+}
+
+int main(int argc, char **argv)
+{
+    QTestState *s;
+    int r;
+
+    g_test_init(&argc, &argv, NULL);
+
+    s = qtest_init("-machine ast2600-evb");
+    qtest_add_data_func("/ast2600/gpio/set_colocated_pins", s,
+                        test_set_colocated_pins);
+    r = g_test_run();
+    qtest_quit(s);
+
+    return r;
+}

tests/qtest/meson.build

@@ -189,7 +189,8 @@ qtests_npcm7xx = \
    (slirp.found() ? ['npcm7xx_emc-test'] : [])
 qtests_aspeed = \
   ['aspeed_hace-test',
-   'aspeed_smc-test']
+   'aspeed_smc-test',
+   'aspeed_gpio-test']
 qtests_arm = \
   (config_all_devices.has_key('CONFIG_MPS2') ? ['sse-timer-test'] : []) + \
   (config_all_devices.has_key('CONFIG_CMSDK_APB_DUALTIMER') ? ['cmsdk-apb-dualtimer-test'] : []) + \