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[1/3] i2c: s3c24xx: fix read transfers in polled mode

Message ID 20230928192414.258169-2-m.szyprowski@samsung.com
State Superseded
Headers show
Series Add atomic transfers to s3c24xx i2c driver | expand

Commit Message

Marek Szyprowski Sept. 28, 2023, 7:24 p.m. UTC 
To properly handle read transfers in polled mode, no waiting for the ACK
state is needed. Just wait a bit to ensure start state is on the bus and
continue processing bytes.

Fixes: 117053f77a5a ("i2c: s3c2410: Add polling mode support")
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
---
 drivers/i2c/busses/i2c-s3c2410.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index 127eb3805fac..f9dcb1112a61 100644
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -216,8 +216,13 @@  static bool is_ack(struct s3c24xx_i2c *i2c)
 	int tries;
 
 	for (tries = 50; tries; --tries) {
-		if (readl(i2c->regs + S3C2410_IICCON)
-			& S3C2410_IICCON_IRQPEND) {
+		unsigned long tmp = readl(i2c->regs + S3C2410_IICCON);
+
+		if (!(tmp & S3C2410_IICCON_ACKEN)) {
+			usleep_range(100, 200);
+			return true;
+		}
+		if (tmp & S3C2410_IICCON_IRQPEND) {
 			if (!(readl(i2c->regs + S3C2410_IICSTAT)
 				& S3C2410_IICSTAT_LASTBIT))
 				return true;