From: Ludovic Barre <ludovic.Barre@st.com>
To: Ulf Hansson <ulf.hansson@linaro.org>, Rob Herring <robh+dt@kernel.org>
Cc: <srinivas.kandagatla@linaro.org>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
Alexandre Torgue <alexandre.torgue@st.com>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, <devicetree@vger.kernel.org>,
<linux-mmc@vger.kernel.org>,
<linux-stm32@st-md-mailman.stormreply.com>,
Ludovic Barre <ludovic.barre@st.com>
Subject: [PATCH 1/1] mmc: mmci: add threaded irq to abort DPSM of non-functional state
Date: Wed, 13 Nov 2019 18:25:14 +0100 [thread overview]
Message-ID: <20191113172514.19052-1-ludovic.Barre@st.com> (raw)
From: Ludovic Barre <ludovic.barre@st.com>
If datatimeout occurs on R1B request, the Data Path State Machine stays
in busy and is non-functional. Only a reset aborts the DPSM.
Like a reset must be outside of critical section, this patch adds
threaded irq function to release state machine. In this case,
the mmc_request_done is called at the end of threaded irq and
skipped into irq handler.
Signed-off-by: Ludovic Barre <ludovic.barre@st.com>
---
drivers/mmc/host/mmci.c | 44 ++++++++++++++++++++++++++++++++++++-----
drivers/mmc/host/mmci.h | 1 +
2 files changed, 40 insertions(+), 5 deletions(-)
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 40e72c30ea84..ec6e249c87ca 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -556,6 +556,9 @@ static void mmci_dma_error(struct mmci_host *host)
static void
mmci_request_end(struct mmci_host *host, struct mmc_request *mrq)
{
+ if (host->irq_action == IRQ_WAKE_THREAD)
+ return;
+
writel(0, host->base + MMCICOMMAND);
BUG_ON(host->data);
@@ -1321,6 +1324,7 @@ mmci_cmd_irq(struct mmci_host *host, struct mmc_command *cmd,
} else if (host->variant->busy_timeout && busy_resp &&
status & MCI_DATATIMEOUT) {
cmd->error = -ETIMEDOUT;
+ host->irq_action = IRQ_WAKE_THREAD;
} else {
cmd->resp[0] = readl(base + MMCIRESPONSE0);
cmd->resp[1] = readl(base + MMCIRESPONSE1);
@@ -1532,9 +1536,9 @@ static irqreturn_t mmci_irq(int irq, void *dev_id)
{
struct mmci_host *host = dev_id;
u32 status;
- int ret = 0;
spin_lock(&host->lock);
+ host->irq_action = IRQ_HANDLED;
do {
status = readl(host->base + MMCISTATUS);
@@ -1574,12 +1578,41 @@ static irqreturn_t mmci_irq(int irq, void *dev_id)
if (host->variant->busy_detect_flag)
status &= ~host->variant->busy_detect_flag;
- ret = 1;
} while (status);
spin_unlock(&host->lock);
- return IRQ_RETVAL(ret);
+ return host->irq_action;
+}
+
+/*
+ * mmci_irq_threaded is call if the mmci host need to release state machines
+ * before to terminate the request.
+ * If datatimeout occurs on R1B request, the Data Path State Machine stays
+ * in busy and is non-functional. Only a reset can to abort the DPSM.
+ */
+static irqreturn_t mmci_irq_threaded(int irq, void *dev_id)
+{
+ struct mmci_host *host = dev_id;
+ unsigned long flags;
+
+ if (host->rst) {
+ reset_control_assert(host->rst);
+ udelay(2);
+ reset_control_deassert(host->rst);
+ }
+
+ spin_lock_irqsave(&host->lock, flags);
+ writel(host->clk_reg, host->base + MMCICLOCK);
+ writel(host->pwr_reg, host->base + MMCIPOWER);
+ writel(MCI_IRQENABLE | host->variant->start_err,
+ host->base + MMCIMASK0);
+
+ host->irq_action = IRQ_HANDLED;
+ mmci_request_end(host, host->mrq);
+ spin_unlock_irqrestore(&host->lock, flags);
+
+ return host->irq_action;
}
static void mmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
@@ -2071,8 +2104,9 @@ static int mmci_probe(struct amba_device *dev,
goto clk_disable;
}
- ret = devm_request_irq(&dev->dev, dev->irq[0], mmci_irq, IRQF_SHARED,
- DRIVER_NAME " (cmd)", host);
+ ret = devm_request_threaded_irq(&dev->dev, dev->irq[0], mmci_irq,
+ mmci_irq_threaded, IRQF_SHARED,
+ DRIVER_NAME " (cmd)", host);
if (ret)
goto clk_disable;
diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h
index 158e1231aa23..5e63c0596364 100644
--- a/drivers/mmc/host/mmci.h
+++ b/drivers/mmc/host/mmci.h
@@ -412,6 +412,7 @@ struct mmci_host {
struct timer_list timer;
unsigned int oldstat;
+ u32 irq_action;
/* pio stuff */
struct sg_mapping_iter sg_miter;
--
2.17.1
next reply other threads:[~2019-11-13 17:25 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-13 17:25 Ludovic Barre [this message]
2019-11-14 15:09 ` [PATCH 1/1] mmc: mmci: add threaded irq to abort DPSM of non-functional state Ulf Hansson
2019-11-15 14:59 ` Ludovic BARRE
2019-11-28 14:06 ` [Linux-stm32] " Ludovic BARRE
2019-12-10 12:20 ` Ulf Hansson
2019-12-10 12:30 ` Ulf Hansson
2019-12-10 14:03 ` Ludovic BARRE
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