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[3/4,resend] fb_ddc: Allow I2C adapters without SCL read capability

Message ID 1427054147-26158-3-git-send-email-linux@rainbow-software.org (mailing list archive)
State New, archived
Headers show

Commit Message

Ondrej Zary March 22, 2015, 7:55 p.m. UTC 
i2c-algo-bit allows I2C adapters without SCL read capability to work but
fb_ddc_read fails to work on them.

Fix fb_ddc_read to work with I2C adapters not capable of reading SCL.

Signed-off-by: Ondrej Zary <linux@rainbow-software.org>
Acked-by: Krzysztof Helt <krzysztof.h1@wp.pl>
---
 drivers/video/fbdev/core/fb_ddc.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)
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Patch

diff --git a/drivers/video/fbdev/core/fb_ddc.c b/drivers/video/fbdev/core/fb_ddc.c
index 94322cc..22c694a 100644
--- a/drivers/video/fbdev/core/fb_ddc.c
+++ b/drivers/video/fbdev/core/fb_ddc.c
@@ -69,10 +69,11 @@  unsigned char *fb_ddc_read(struct i2c_adapter *adapter)
 		algo_data->setscl(algo_data->data, 1);
 		for (j = 0; j < 5; j++) {
 			msleep(10);
-			if (algo_data->getscl(algo_data->data))
+			if (algo_data->getscl &&
+			    algo_data->getscl(algo_data->data))
 				break;
 		}
-		if (j == 5)
+		if (algo_data->getscl && j == 5)
 			continue;
 
 		algo_data->setsda(algo_data->data, 0);
@@ -91,7 +92,8 @@  unsigned char *fb_ddc_read(struct i2c_adapter *adapter)
 		algo_data->setscl(algo_data->data, 1);
 		for (j = 0; j < 10; j++) {
 			msleep(10);
-			if (algo_data->getscl(algo_data->data))
+			if (algo_data->getscl &&
+			    algo_data->getscl(algo_data->data))
 				break;
 		}