linux-kernel - [PATCH V3 2/2] EDAC/synopsys: Re-enable the interrupts in intr

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Date:   Sun, 24 Apr 2022 09:33:45 +0800
From:   Sherry Sun <sherry.sun@....com>
To:     michal.simek@...inx.com, bp@...en8.de,
        Shubhrajyoti.datta@...inx.com, mchehab@...nel.org,
        tony.luck@...el.com, james.morse@....com, rric@...nel.org
Cc:     linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-imx@....com
Subject: [PATCH V3 2/2] EDAC/synopsys: Re-enable the interrupts in intr_handler for v3.x Synopsys EDAC DDR

zynqmp_get_error_info() writes 0 to the ECC_CLR_OFST register after an
interrupt for a {un-,}correctable error is raised, which disables the
error interrupts, then the interrupt handler will be called only once.
Therefore, re-enable the error interrupt line at the end of intr_handler
for v3.x Synopsys EDAC DDR.

Signed-off-by: Sherry Sun <sherry.sun@....com>
Reviewed-by: Shubhrajyoti Datta <Shubhrajyoti.datta@...inx.com>
Acked-by: Michal Simek <michal.simek@...inx.com>
---
Changes in V3:
1. Improve the patch title and commit message as Borislav suggested.
2. Simply move {enable,disable}_intr() upwards instead of the enable_intr()
forward declaration.
---
 drivers/edac/synopsys_edac.c | 47 +++++++++++++++++++-----------------
 1 file changed, 25 insertions(+), 22 deletions(-)

diff --git a/drivers/edac/synopsys_edac.c b/drivers/edac/synopsys_edac.c
index 88a481043d4c..a14baeca6400 100644
--- a/drivers/edac/synopsys_edac.c
+++ b/drivers/edac/synopsys_edac.c
@@ -527,6 +527,28 @@ static void handle_error(struct mem_ctl_info *mci, struct synps_ecc_status *p)
 	memset(p, 0, sizeof(*p));
 }
 
+static void enable_intr(struct synps_edac_priv *priv)
+{
+	/* Enable UE/CE Interrupts */
+	if (priv->p_data->quirks & DDR_ECC_INTR_SELF_CLEAR)
+		writel(DDR_UE_MASK | DDR_CE_MASK,
+		       priv->baseaddr + ECC_CLR_OFST);
+	else
+		writel(DDR_QOSUE_MASK | DDR_QOSCE_MASK,
+		       priv->baseaddr + DDR_QOS_IRQ_EN_OFST);
+
+}
+
+static void disable_intr(struct synps_edac_priv *priv)
+{
+	/* Disable UE/CE Interrupts */
+	if (priv->p_data->quirks & DDR_ECC_INTR_SELF_CLEAR)
+		writel(0x0, priv->baseaddr + ECC_CLR_OFST);
+	else
+		writel(DDR_QOSUE_MASK | DDR_QOSCE_MASK,
+		       priv->baseaddr + DDR_QOS_IRQ_DB_OFST);
+}
+
 /**
  * intr_handler - Interrupt Handler for ECC interrupts.
  * @irq:        IRQ number.
@@ -568,6 +590,9 @@ static irqreturn_t intr_handler(int irq, void *dev_id)
 	/* v3.0 of the controller does not have this register */
 	if (!(priv->p_data->quirks & DDR_ECC_INTR_SELF_CLEAR))
 		writel(regval, priv->baseaddr + DDR_QOS_IRQ_STAT_OFST);
+	else
+		enable_intr(priv);
+
 	return IRQ_HANDLED;
 }
 
@@ -850,28 +875,6 @@ static void mc_init(struct mem_ctl_info *mci, struct platform_device *pdev)
 	init_csrows(mci);
 }
 
-static void enable_intr(struct synps_edac_priv *priv)
-{
-	/* Enable UE/CE Interrupts */
-	if (priv->p_data->quirks & DDR_ECC_INTR_SELF_CLEAR)
-		writel(DDR_UE_MASK | DDR_CE_MASK,
-		       priv->baseaddr + ECC_CLR_OFST);
-	else
-		writel(DDR_QOSUE_MASK | DDR_QOSCE_MASK,
-		       priv->baseaddr + DDR_QOS_IRQ_EN_OFST);
-
-}
-
-static void disable_intr(struct synps_edac_priv *priv)
-{
-	/* Disable UE/CE Interrupts */
-	if (priv->p_data->quirks & DDR_ECC_INTR_SELF_CLEAR)
-		writel(0x0, priv->baseaddr + ECC_CLR_OFST);
-	else
-		writel(DDR_QOSUE_MASK | DDR_QOSCE_MASK,
-		       priv->baseaddr + DDR_QOS_IRQ_DB_OFST);
-}
-
 static int setup_irq(struct mem_ctl_info *mci,
 		     struct platform_device *pdev)
 {
-- 
2.17.1