Re: [PATCH v4 7/8] hw/misc/pca9552: Trace GPIO change events
On 6/22/20 9:01 AM, Cédric Le Goater wrote: > On 6/21/20 12:58 AM, Philippe Mathieu-Daudé wrote: >> Emit a trace event when a GPIO change its state. > > I understand now why you need 'pin_status'. > > We could compute 'pin_status' and 'pin_changed' in routine > pca9552_update_pin_input() when updating the PCA9552_INPUT0/1 > register values and pass them to pca9552_display_pins_status() > or something like that. Good idea, thanks! > > Maybe add two different display routines also. > >> >> Example booting obmc-phosphor-image: >> >> $ qemu-system-arm -M witherspoon-bmc -trace pca9552_gpio_change >> 1592690552.687372:pca9552_gpio_change pca1 GPIO id:0 status: 0 -> 1 >> 1592690552.690169:pca9552_gpio_change pca1 GPIO id:1 status: 0 -> 1 >> 1592690552.691673:pca9552_gpio_change pca1 GPIO id:2 status: 0 -> 1 >> 1592690552.696886:pca9552_gpio_change pca1 GPIO id:3 status: 0 -> 1 >> 1592690552.698614:pca9552_gpio_change pca1 GPIO id:13 status: 0 -> 1 >> 1592690552.699833:pca9552_gpio_change pca1 GPIO id:14 status: 0 -> 1 >> 1592690552.700842:pca9552_gpio_change pca1 GPIO id:15 status: 0 -> 1 >> 1592690683.841921:pca9552_gpio_change pca1 GPIO id:14 status: 1 -> 0 >> 1592690683.861660:pca9552_gpio_change pca1 GPIO id:14 status: 0 -> 1 >> 1592690684.371460:pca9552_gpio_change pca1 GPIO id:14 status: 1 -> 0 >> 1592690684.882115:pca9552_gpio_change pca1 GPIO id:14 status: 0 -> 1 >> 1592690685.391411:pca9552_gpio_change pca1 GPIO id:14 status: 1 -> 0 >> 1592690685.901391:pca9552_gpio_change pca1 GPIO id:14 status: 0 -> 1 >> 1592690686.411678:pca9552_gpio_change pca1 GPIO id:14 status: 1 -> 0 >> 1592690686.921279:pca9552_gpio_change pca1 GPIO id:14 status: 0 -> 1 >> >> We notice the GPIO #14 (front-power LED) starts to blink. >> >> This LED is described in the witherspoon device-tree [*]: >> >> front-power { >> retain-state-shutdown; >> default-state = "keep"; >> gpios = <&pca0 14 GPIO_ACTIVE_LOW>; >> }; >> >> [*] >> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm/boot/dts/aspeed-bmc-opp-witherspoon.dts?id=b1f9be9392f0#n140 >> >> Signed-off-by: Philippe Mathieu-Daudé >> --- >> hw/misc/pca9552.c| 15 +++ >> hw/misc/trace-events | 1 + >> 2 files changed, 16 insertions(+) >> >> diff --git a/hw/misc/pca9552.c b/hw/misc/pca9552.c >> index f0d435e310..85557b78d9 100644 >> --- a/hw/misc/pca9552.c >> +++ b/hw/misc/pca9552.c >> @@ -60,6 +60,21 @@ static void pca9552_display_pins_status(PCA9552State *s) >> buf[i] = '\0'; >> trace_pca9552_gpio_status(s->description, buf); >> } >> +if (trace_event_get_state_backends(TRACE_PCA9552_GPIO_CHANGE)) { >> +for (i = 0; i < s->nr_leds; i++) { >> +if (extract32(pins_changed, i, 1)) { >> +unsigned new_state = extract32(pins_status, i, 1); >> + >> +/* >> + * We display the state using the PCA logic ("active-high"). >> + * This is not the state of the LED, which signal might be >> + * wired "active-low" on the board. >> + */ >> +trace_pca9552_gpio_change(s->description, i, >> + !new_state, new_state); >> +} >> +} >> +} >> } >> >> static void pca9552_update_pin_input(PCA9552State *s) >> diff --git a/hw/misc/trace-events b/hw/misc/trace-events >> index 7630e59652..805d2110e0 100644 >> --- a/hw/misc/trace-events >> +++ b/hw/misc/trace-events >> @@ -209,3 +209,4 @@ grlib_apb_pnp_read(uint64_t addr, uint32_t value) "APB >> PnP read addr:0x%03"PRIx6 >> >> # pca9552.c >> pca9552_gpio_status(const char *description, const char *buf) "%s GPIOs >> 0-15 [%s]" >> +pca9552_gpio_change(const char *description, unsigned id, unsigned >> prev_state, unsigned current_state) "%s GPIO id:%u status: %u -> %u" >> > >
Re: [PATCH v4 7/8] hw/misc/pca9552: Trace GPIO change events
On 6/21/20 12:58 AM, Philippe Mathieu-Daudé wrote: > Emit a trace event when a GPIO change its state. I understand now why you need 'pin_status'. We could compute 'pin_status' and 'pin_changed' in routine pca9552_update_pin_input() when updating the PCA9552_INPUT0/1 register values and pass them to pca9552_display_pins_status() or something like that. Maybe add two different display routines also. > > Example booting obmc-phosphor-image: > > $ qemu-system-arm -M witherspoon-bmc -trace pca9552_gpio_change > 1592690552.687372:pca9552_gpio_change pca1 GPIO id:0 status: 0 -> 1 > 1592690552.690169:pca9552_gpio_change pca1 GPIO id:1 status: 0 -> 1 > 1592690552.691673:pca9552_gpio_change pca1 GPIO id:2 status: 0 -> 1 > 1592690552.696886:pca9552_gpio_change pca1 GPIO id:3 status: 0 -> 1 > 1592690552.698614:pca9552_gpio_change pca1 GPIO id:13 status: 0 -> 1 > 1592690552.699833:pca9552_gpio_change pca1 GPIO id:14 status: 0 -> 1 > 1592690552.700842:pca9552_gpio_change pca1 GPIO id:15 status: 0 -> 1 > 1592690683.841921:pca9552_gpio_change pca1 GPIO id:14 status: 1 -> 0 > 1592690683.861660:pca9552_gpio_change pca1 GPIO id:14 status: 0 -> 1 > 1592690684.371460:pca9552_gpio_change pca1 GPIO id:14 status: 1 -> 0 > 1592690684.882115:pca9552_gpio_change pca1 GPIO id:14 status: 0 -> 1 > 1592690685.391411:pca9552_gpio_change pca1 GPIO id:14 status: 1 -> 0 > 1592690685.901391:pca9552_gpio_change pca1 GPIO id:14 status: 0 -> 1 > 1592690686.411678:pca9552_gpio_change pca1 GPIO id:14 status: 1 -> 0 > 1592690686.921279:pca9552_gpio_change pca1 GPIO id:14 status: 0 -> 1 > > We notice the GPIO #14 (front-power LED) starts to blink. > > This LED is described in the witherspoon device-tree [*]: > > front-power { > retain-state-shutdown; > default-state = "keep"; > gpios = <&pca0 14 GPIO_ACTIVE_LOW>; > }; > > [*] > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm/boot/dts/aspeed-bmc-opp-witherspoon.dts?id=b1f9be9392f0#n140 > > Signed-off-by: Philippe Mathieu-Daudé > --- > hw/misc/pca9552.c| 15 +++ > hw/misc/trace-events | 1 + > 2 files changed, 16 insertions(+) > > diff --git a/hw/misc/pca9552.c b/hw/misc/pca9552.c > index f0d435e310..85557b78d9 100644 > --- a/hw/misc/pca9552.c > +++ b/hw/misc/pca9552.c > @@ -60,6 +60,21 @@ static void pca9552_display_pins_status(PCA9552State *s) > buf[i] = '\0'; > trace_pca9552_gpio_status(s->description, buf); > } > +if (trace_event_get_state_backends(TRACE_PCA9552_GPIO_CHANGE)) { > +for (i = 0; i < s->nr_leds; i++) { > +if (extract32(pins_changed, i, 1)) { > +unsigned new_state = extract32(pins_status, i, 1); > + > +/* > + * We display the state using the PCA logic ("active-high"). > + * This is not the state of the LED, which signal might be > + * wired "active-low" on the board. > + */ > +trace_pca9552_gpio_change(s->description, i, > + !new_state, new_state); > +} > +} > +} > } > > static void pca9552_update_pin_input(PCA9552State *s) > diff --git a/hw/misc/trace-events b/hw/misc/trace-events > index 7630e59652..805d2110e0 100644 > --- a/hw/misc/trace-events > +++ b/hw/misc/trace-events > @@ -209,3 +209,4 @@ grlib_apb_pnp_read(uint64_t addr, uint32_t value) "APB > PnP read addr:0x%03"PRIx6 > > # pca9552.c > pca9552_gpio_status(const char *description, const char *buf) "%s GPIOs 0-15 > [%s]" > +pca9552_gpio_change(const char *description, unsigned id, unsigned > prev_state, unsigned current_state) "%s GPIO id:%u status: %u -> %u" >
[PATCH v4 7/8] hw/misc/pca9552: Trace GPIO change events
Emit a trace event when a GPIO change its state. Example booting obmc-phosphor-image: $ qemu-system-arm -M witherspoon-bmc -trace pca9552_gpio_change 1592690552.687372:pca9552_gpio_change pca1 GPIO id:0 status: 0 -> 1 1592690552.690169:pca9552_gpio_change pca1 GPIO id:1 status: 0 -> 1 1592690552.691673:pca9552_gpio_change pca1 GPIO id:2 status: 0 -> 1 1592690552.696886:pca9552_gpio_change pca1 GPIO id:3 status: 0 -> 1 1592690552.698614:pca9552_gpio_change pca1 GPIO id:13 status: 0 -> 1 1592690552.699833:pca9552_gpio_change pca1 GPIO id:14 status: 0 -> 1 1592690552.700842:pca9552_gpio_change pca1 GPIO id:15 status: 0 -> 1 1592690683.841921:pca9552_gpio_change pca1 GPIO id:14 status: 1 -> 0 1592690683.861660:pca9552_gpio_change pca1 GPIO id:14 status: 0 -> 1 1592690684.371460:pca9552_gpio_change pca1 GPIO id:14 status: 1 -> 0 1592690684.882115:pca9552_gpio_change pca1 GPIO id:14 status: 0 -> 1 1592690685.391411:pca9552_gpio_change pca1 GPIO id:14 status: 1 -> 0 1592690685.901391:pca9552_gpio_change pca1 GPIO id:14 status: 0 -> 1 1592690686.411678:pca9552_gpio_change pca1 GPIO id:14 status: 1 -> 0 1592690686.921279:pca9552_gpio_change pca1 GPIO id:14 status: 0 -> 1 We notice the GPIO #14 (front-power LED) starts to blink. This LED is described in the witherspoon device-tree [*]: front-power { retain-state-shutdown; default-state = "keep"; gpios = <&pca0 14 GPIO_ACTIVE_LOW>; }; [*] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm/boot/dts/aspeed-bmc-opp-witherspoon.dts?id=b1f9be9392f0#n140 Signed-off-by: Philippe Mathieu-Daudé --- hw/misc/pca9552.c| 15 +++ hw/misc/trace-events | 1 + 2 files changed, 16 insertions(+) diff --git a/hw/misc/pca9552.c b/hw/misc/pca9552.c index f0d435e310..85557b78d9 100644 --- a/hw/misc/pca9552.c +++ b/hw/misc/pca9552.c @@ -60,6 +60,21 @@ static void pca9552_display_pins_status(PCA9552State *s) buf[i] = '\0'; trace_pca9552_gpio_status(s->description, buf); } +if (trace_event_get_state_backends(TRACE_PCA9552_GPIO_CHANGE)) { +for (i = 0; i < s->nr_leds; i++) { +if (extract32(pins_changed, i, 1)) { +unsigned new_state = extract32(pins_status, i, 1); + +/* + * We display the state using the PCA logic ("active-high"). + * This is not the state of the LED, which signal might be + * wired "active-low" on the board. + */ +trace_pca9552_gpio_change(s->description, i, + !new_state, new_state); +} +} +} } static void pca9552_update_pin_input(PCA9552State *s) diff --git a/hw/misc/trace-events b/hw/misc/trace-events index 7630e59652..805d2110e0 100644 --- a/hw/misc/trace-events +++ b/hw/misc/trace-events @@ -209,3 +209,4 @@ grlib_apb_pnp_read(uint64_t addr, uint32_t value) "APB PnP read addr:0x%03"PRIx6 # pca9552.c pca9552_gpio_status(const char *description, const char *buf) "%s GPIOs 0-15 [%s]" +pca9552_gpio_change(const char *description, unsigned id, unsigned prev_state, unsigned current_state) "%s GPIO id:%u status: %u -> %u" -- 2.21.3