This is a note to let you know that I've just added the patch titled
spi/s3c64xx: modified error interrupt handling and init
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
spi-s3c64xx-modified-error-interrupt-handling-and-init.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
>From 375981f2e14868be16cafbffd34a4f16a6ee01c6 Mon Sep 17 00:00:00 2001
From: Girish K S <girishks2...@gmail.com>
Date: Wed, 13 Mar 2013 12:13:30 +0530
Subject: spi/s3c64xx: modified error interrupt handling and init
From: Girish K S <girishks2...@gmail.com>
commit 375981f2e14868be16cafbffd34a4f16a6ee01c6 upstream.
The status of the interrupt is available in the status register,
so reading the clear pending register and writing back the same
value will not actually clear the pending interrupts. This patch
modifies the interrupt handler to read the status register and
clear the corresponding pending bit in the clear pending register.
Modified the hwInit function to clear all the pending interrupts.
Signed-off-by: Girish K S <ks.g...@samsung.com>
Signed-off-by: Mark Brown <broo...@opensource.wolfsonmicro.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/spi/spi-s3c64xx.c | 41 +++++++++++++++++++++++++----------------
1 file changed, 25 insertions(+), 16 deletions(-)
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -889,25 +889,30 @@ static irqreturn_t s3c64xx_spi_irq(int i
{
struct s3c64xx_spi_driver_data *sdd = data;
struct spi_master *spi = sdd->master;
- unsigned int val;
-
- val = readl(sdd->regs + S3C64XX_SPI_PENDING_CLR);
-
- val &= S3C64XX_SPI_PND_RX_OVERRUN_CLR |
- S3C64XX_SPI_PND_RX_UNDERRUN_CLR |
- S3C64XX_SPI_PND_TX_OVERRUN_CLR |
- S3C64XX_SPI_PND_TX_UNDERRUN_CLR;
+ unsigned int val, clr = 0;
- writel(val, sdd->regs + S3C64XX_SPI_PENDING_CLR);
+ val = readl(sdd->regs + S3C64XX_SPI_STATUS);
- if (val & S3C64XX_SPI_PND_RX_OVERRUN_CLR)
+ if (val & S3C64XX_SPI_ST_RX_OVERRUN_ERR) {
+ clr = S3C64XX_SPI_PND_RX_OVERRUN_CLR;
dev_err(&spi->dev, "RX overrun\n");
- if (val & S3C64XX_SPI_PND_RX_UNDERRUN_CLR)
+ }
+ if (val & S3C64XX_SPI_ST_RX_UNDERRUN_ERR) {
+ clr |= S3C64XX_SPI_PND_RX_UNDERRUN_CLR;
dev_err(&spi->dev, "RX underrun\n");
- if (val & S3C64XX_SPI_PND_TX_OVERRUN_CLR)
+ }
+ if (val & S3C64XX_SPI_ST_TX_OVERRUN_ERR) {
+ clr |= S3C64XX_SPI_PND_TX_OVERRUN_CLR;
dev_err(&spi->dev, "TX overrun\n");
- if (val & S3C64XX_SPI_PND_TX_UNDERRUN_CLR)
+ }
+ if (val & S3C64XX_SPI_ST_TX_UNDERRUN_ERR) {
+ clr |= S3C64XX_SPI_PND_TX_UNDERRUN_CLR;
dev_err(&spi->dev, "TX underrun\n");
+ }
+
+ /* Clear the pending irq by setting and then clearing it */
+ writel(clr, sdd->regs + S3C64XX_SPI_PENDING_CLR);
+ writel(0, sdd->regs + S3C64XX_SPI_PENDING_CLR);
return IRQ_HANDLED;
}
@@ -931,9 +936,13 @@ static void s3c64xx_spi_hwinit(struct s3
writel(0, regs + S3C64XX_SPI_MODE_CFG);
writel(0, regs + S3C64XX_SPI_PACKET_CNT);
- /* Clear any irq pending bits */
- writel(readl(regs + S3C64XX_SPI_PENDING_CLR),
- regs + S3C64XX_SPI_PENDING_CLR);
+ /* Clear any irq pending bits, should set and clear the bits */
+ val = S3C64XX_SPI_PND_RX_OVERRUN_CLR |
+ S3C64XX_SPI_PND_RX_UNDERRUN_CLR |
+ S3C64XX_SPI_PND_TX_OVERRUN_CLR |
+ S3C64XX_SPI_PND_TX_UNDERRUN_CLR;
+ writel(val, regs + S3C64XX_SPI_PENDING_CLR);
+ writel(0, regs + S3C64XX_SPI_PENDING_CLR);
writel(0, regs + S3C64XX_SPI_SWAP_CFG);
Patches currently in stable-queue which might be from girishks2...@gmail.com are
queue-3.4/spi-s3c64xx-modified-error-interrupt-handling-and-init.patch
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