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authorChris Brandt <chris.brandt@renesas.com>2017-10-07 22:37:45 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-11-08 10:06:29 +0100
commitdec5fcf11b454ebdac7bdf40775bc589dffe2980 (patch)
tree71da6e0680dcb67b378794bec1f127882f8d8cab /drivers/i2c/busses
parent358008062202cb21054cb8130c1e5f184a3784c2 (diff)
i2c: riic: correctly finish transfers
[ Upstream commit 71ccea095ea1d4efd004dab971be6d599e06fc3f ] This fixes the condition where the controller has not fully completed its final transfer and leaves the bus and controller in a undesirable state. At the end of the last transmitted byte, the existing driver would just signal for a STOP condition to be transmitted then immediately signal completion. However, the full STOP procedure might not have fully taken place by the time the runtime PM shuts off the peripheral clock, leaving the bus in a suspended state. Alternatively, the STOP condition on the bus may have completed, but when the next transaction is requested by the upper layer, not all the necessary register cleanup was finished from the last transfer which made the driver return BUS BUSY when it really wasn't. This patch now makes all transmit and receive transactions wait for the STOP condition to fully complete before signaling a completed transaction. With this new method, runtime PM no longer seems to be an issue. Fixes: 310c18a41450 ("i2c: riic: add driver") Signed-off-by: Chris Brandt <chris.brandt@renesas.com> Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/i2c/busses')
-rw-r--r--drivers/i2c/busses/i2c-riic.c30
1 files changed, 23 insertions, 7 deletions
diff --git a/drivers/i2c/busses/i2c-riic.c b/drivers/i2c/busses/i2c-riic.c
index d7e3af671543..d8803c3bbfdc 100644
--- a/drivers/i2c/busses/i2c-riic.c
+++ b/drivers/i2c/busses/i2c-riic.c
@@ -80,6 +80,7 @@
#define ICIER_TEIE 0x40
#define ICIER_RIE 0x20
#define ICIER_NAKIE 0x10
+#define ICIER_SPIE 0x08
#define ICSR2_NACKF 0x10
@@ -216,11 +217,10 @@ static irqreturn_t riic_tend_isr(int irq, void *data)
return IRQ_NONE;
}
- if (riic->is_last || riic->err)
+ if (riic->is_last || riic->err) {
+ riic_clear_set_bit(riic, 0, ICIER_SPIE, RIIC_ICIER);
writeb(ICCR2_SP, riic->base + RIIC_ICCR2);
-
- writeb(0, riic->base + RIIC_ICIER);
- complete(&riic->msg_done);
+ }
return IRQ_HANDLED;
}
@@ -240,13 +240,13 @@ static irqreturn_t riic_rdrf_isr(int irq, void *data)
if (riic->bytes_left == 1) {
/* STOP must come before we set ACKBT! */
- if (riic->is_last)
+ if (riic->is_last) {
+ riic_clear_set_bit(riic, 0, ICIER_SPIE, RIIC_ICIER);
writeb(ICCR2_SP, riic->base + RIIC_ICCR2);
+ }
riic_clear_set_bit(riic, 0, ICMR3_ACKBT, RIIC_ICMR3);
- writeb(0, riic->base + RIIC_ICIER);
- complete(&riic->msg_done);
} else {
riic_clear_set_bit(riic, ICMR3_ACKBT, 0, RIIC_ICMR3);
}
@@ -259,6 +259,21 @@ static irqreturn_t riic_rdrf_isr(int irq, void *data)
return IRQ_HANDLED;
}
+static irqreturn_t riic_stop_isr(int irq, void *data)
+{
+ struct riic_dev *riic = data;
+
+ /* read back registers to confirm writes have fully propagated */
+ writeb(0, riic->base + RIIC_ICSR2);
+ readb(riic->base + RIIC_ICSR2);
+ writeb(0, riic->base + RIIC_ICIER);
+ readb(riic->base + RIIC_ICIER);
+
+ complete(&riic->msg_done);
+
+ return IRQ_HANDLED;
+}
+
static u32 riic_func(struct i2c_adapter *adap)
{
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
@@ -326,6 +341,7 @@ static struct riic_irq_desc riic_irqs[] = {
{ .res_num = 0, .isr = riic_tend_isr, .name = "riic-tend" },
{ .res_num = 1, .isr = riic_rdrf_isr, .name = "riic-rdrf" },
{ .res_num = 2, .isr = riic_tdre_isr, .name = "riic-tdre" },
+ { .res_num = 3, .isr = riic_stop_isr, .name = "riic-stop" },
{ .res_num = 5, .isr = riic_tend_isr, .name = "riic-nack" },
};