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Commit 9c7f9265 authored by Gidon Studinski's avatar Gidon Studinski Committed by Gerrit - the friendly Code Review server
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msm: ipa: handle IPA interrupt when IPA is OFF 



In case IPA isr is called when IPA is clocked off,
defer the interrupt processing to workqueue and
wakeup IPA.

Change-Id: I95d2e3f57f9942317e6daa0f8394adbc922f09df
Acked-by: default avatarAdy Abraham <adya@qti.qualcomm.com>
Signed-off-by: default avatarNadine Toledano <nadinet@codeaurora.org>
Signed-off-by: default avatarGidon Studinski <gidons@codeaurora.org>
parent 3d109ee5

drivers/platform/msm/ipa/ipa_interrupts.c

+48 −8
Original line number Diff line number Diff line
@@ -32,6 +32,9 @@ static struct ipa_interrupt_info ipa_interrupt_to_cb[IPA_IRQ_MAX]; 
static struct workqueue_struct *ipa_interrupt_wq;

static u32 ipa_ee;



static void ipa_interrupt_defer(struct work_struct *work);

static DECLARE_WORK(ipa_interrupt_defer_work, ipa_interrupt_defer);



static void deferred_interrupt_work(struct work_struct *work)

{

	struct ipa_interrupt_work_wrap *work_data =
@@ -122,22 +125,59 @@ fail_alloc_work: 
	return res;

}



static irqreturn_t ipa_isr(int irq, void *ctxt)

static void ipa_process_interrupts(void)

{

	u32 reg;

	u32 bmsk = 1;

	u32 bmsk;

	u32 i = 0;

	u32 en;



	en = ipa_read_reg(ipa_ctx->mmio, IPA_IRQ_EN_EE_n_ADDR(ipa_ee));

	reg = ipa_read_reg(ipa_ctx->mmio, IPA_IRQ_STTS_EE_n_ADDR(ipa_ee));

	while (en & reg) {

		bmsk = 1;

		for (i = 0; i < IPA_IRQ_MAX; i++) {

			if (en & reg & bmsk)

				handle_interrupt(i);

			bmsk = bmsk << 1;

		}

	ipa_write_reg(ipa_ctx->mmio, IPA_IRQ_CLR_EE_n_ADDR(ipa_ee), reg);

		ipa_write_reg(ipa_ctx->mmio,

				IPA_IRQ_CLR_EE_n_ADDR(ipa_ee), reg);

		reg = ipa_read_reg(ipa_ctx->mmio,

				IPA_IRQ_STTS_EE_n_ADDR(ipa_ee));

	}

}



static void ipa_interrupt_defer(struct work_struct *work)

{

	IPADBG("processing interrupts in wq\n");

	ipa_inc_client_enable_clks();

	ipa_process_interrupts();

	ipa_dec_client_disable_clks();

	IPADBG("Done\n");

}



static irqreturn_t ipa_isr(int irq, void *ctxt)

{

	unsigned long flags;



	/* defer interrupt handling in case IPA is not clocked on */

	if (ipa_active_clients_trylock(&flags) == 0) {

		IPADBG("defer interrupt processing\n");

		queue_work(ipa_ctx->power_mgmt_wq, &ipa_interrupt_defer_work);

		return IRQ_HANDLED;

	}



	if (ipa_ctx->ipa_active_clients.cnt == 0) {

		IPADBG("defer interrupt processing\n");

		queue_work(ipa_ctx->power_mgmt_wq, &ipa_interrupt_defer_work);

		goto bail;

	}



	ipa_process_interrupts();



bail:

	ipa_active_clients_trylock_unlock(&flags);

	return IRQ_HANDLED;

}

/**
@@ -240,7 +280,7 @@ int ipa_interrupts_init(u32 ipa_irq, u32 ee, struct device *ipa_dev) 
	ipa_write_reg(ipa_ctx->mmio, IPA_IRQ_CLR_EE_n_ADDR(ipa_ee), reg);



	res = request_irq(ipa_irq, (irq_handler_t) ipa_isr,

				IRQF_TRIGGER_HIGH, "ipa", ipa_dev);

				IRQF_TRIGGER_RISING, "ipa", ipa_dev);

	if (res) {

		IPAERR("fail to register IPA IRQ handler irq=%d\n", ipa_irq);

		return -ENODEV;