|author||Vishnu Motghare <email@example.com>||2014-12-03 18:05:25 +0530|
|committer||Wolfram Sang <firstname.lastname@example.org>||2014-12-04 19:25:41 +0100|
i2c: cadence: Set the hardware time-out register to maximum value
Cadence I2C controller has bug wherein it generates invalid read transactions after timeout in master receiver mode. This driver does not use the HW timeout and this interrupt is disabled but the feature itself cannot be disabled. Hence, this patch writes the maximum value (0xFF) to this register. This is one of the workarounds to this bug and it will not avoid the issue completely but reduces the chances of error. Signed-off-by: Vishnu Motghare <email@example.com> Signed-off-by: Harini Katakam <firstname.lastname@example.org> Signed-off-by: Wolfram Sang <email@example.com> Cc: firstname.lastname@example.org
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-cadence.c b/drivers/i2c/busses/i2c-cadence.c
index 63f3f03ecc9b..c604f4c3ac0d 100644
@@ -111,6 +111,8 @@
#define CDNS_I2C_DIVA_MAX 4
#define CDNS_I2C_DIVB_MAX 64
+#define CDNS_I2C_TIMEOUT_MAX 0xFF
#define cdns_i2c_readreg(offset) readl_relaxed(id->membase + offset)
#define cdns_i2c_writereg(val, offset) writel_relaxed(val, id->membase + offset)
@@ -852,6 +854,15 @@ static int cdns_i2c_probe(struct platform_device *pdev)
+ * Cadence I2C controller has a bug wherein it generates
+ * invalid read transaction after HW timeout in master receiver mode.
+ * HW timeout is not used by this driver and the interrupt is disabled.
+ * But the feature itself cannot be disabled. Hence maximum value
+ * is written to this register to reduce the chances of error.
+ cdns_i2c_writereg(CDNS_I2C_TIMEOUT_MAX, CDNS_I2C_TIME_OUT_OFFSET);
dev_info(&pdev->dev, "%u kHz mmio %08lx irq %d\n",
id->i2c_clk / 1000, (unsigned long)r_mem->start, id->irq);