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Subject[PATCH 4/4] MFD/PCAP: fix irq bottom handler
From
Date
Mask interrupts before servicing them and loop while pcap asserts the interrupt
line.

Signed-off-by: Daniel Ribeiro <drwyrm@gmail.com>

---
drivers/mfd/ezx-pcap.c | 49 ++++++++++++++++++++++++++---------------------
1 files changed, 27 insertions(+), 22 deletions(-)

diff --git a/drivers/mfd/ezx-pcap.c b/drivers/mfd/ezx-pcap.c
index c512202..732664f 100644
--- a/drivers/mfd/ezx-pcap.c
+++ b/drivers/mfd/ezx-pcap.c
@@ -17,6 +17,7 @@
#include <linux/irq.h>
#include <linux/mfd/ezx-pcap.h>
#include <linux/spi/spi.h>
+#include <linux/gpio.h>

#define PCAP_ADC_MAXQ 8
struct pcap_adc_request {
@@ -155,34 +156,38 @@ static void pcap_isr_work(struct work_struct *work)
u32 msr, isr, int_sel, service;
int irq;

- ezx_pcap_read(pcap, PCAP_REG_MSR, &msr);
- ezx_pcap_read(pcap, PCAP_REG_ISR, &isr);
+ do {
+ ezx_pcap_read(pcap, PCAP_REG_MSR, &msr);
+ ezx_pcap_read(pcap, PCAP_REG_ISR, &isr);

- /* We cant service/ack irqs that are assigned to port 2 */
- if (!(pdata->config & PCAP_SECOND_PORT)) {
- ezx_pcap_read(pcap, PCAP_REG_INT_SEL, &int_sel);
- isr &= ~int_sel;
- }
- ezx_pcap_write(pcap, PCAP_REG_ISR, isr);
+ /* We cant service/ack irqs that are assigned to port 2 */
+ if (!(pdata->config & PCAP_SECOND_PORT)) {
+ ezx_pcap_read(pcap, PCAP_REG_INT_SEL, &int_sel);
+ isr &= ~int_sel;
+ }

- local_irq_disable();
- service = isr & ~msr;
+ ezx_pcap_write(pcap, PCAP_REG_MSR, isr | msr);
+ ezx_pcap_write(pcap, PCAP_REG_ISR, isr);

- for (irq = pcap->irq_base; service; service >>= 1, irq++) {
- if (service & 1) {
- struct irq_desc *desc = irq_to_desc(irq);
+ local_irq_disable();
+ service = isr & ~msr;
+ for (irq = pcap->irq_base; service; service >>= 1, irq++) {
+ if (service & 1) {
+ struct irq_desc *desc = irq_to_desc(irq);

- if (WARN(!desc, KERN_WARNING
- "Invalid PCAP IRQ %d\n", irq))
- break;
+ if (WARN(!desc, KERN_WARNING
+ "Invalid PCAP IRQ %d\n", irq))
+ break;

- if (desc->status & IRQ_DISABLED)
- note_interrupt(irq, desc, IRQ_NONE);
- else
- desc->handle_irq(irq, desc);
+ if (desc->status & IRQ_DISABLED)
+ note_interrupt(irq, desc, IRQ_NONE);
+ else
+ desc->handle_irq(irq, desc);
+ }
}
- }
- local_irq_enable();
+ local_irq_enable();
+ ezx_pcap_write(pcap, PCAP_REG_MSR, pcap->msr);
+ } while (gpio_get_value(irq_to_gpio(pcap->spi->irq)));
}

static void pcap_irq_handler(unsigned int irq, struct irq_desc *desc)
--
tg: (524551c..) pcap/fix-irq-handler (depends on: pcap/set_ts_bits)
--
Daniel Ribeiro
[unhandled content-type:application/pgp-signature]
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