fb_ddc: Allow I2C adapters without SCL read capability

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: NOndrej Zary <linux@rainbow-software.org>
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

drivers/video/fbdev/core/fb_ddc.c

@@ -67,13 +67,17 @@ unsigned char *fb_ddc_read(struct i2c_adapter *adapter)
 		msleep(13);
 
 		algo_data->setscl(algo_data->data, 1);
-		for (j = 0; j < 5; j++) {
-			msleep(10);
-			if (algo_data->getscl(algo_data->data))
-				break;
+		if (algo_data->getscl) {
+			for (j = 0; j < 5; j++) {
+				msleep(10);
+				if (algo_data->getscl(algo_data->data))
+					break;
+			}
+			if (j == 5)
+				continue;
+		} else {
+			udelay(algo_data->udelay);
 		}
-		if (j == 5)
-			continue;
 
 		algo_data->setsda(algo_data->data, 0);
 		msleep(15);
@@ -89,10 +93,14 @@ unsigned char *fb_ddc_read(struct i2c_adapter *adapter)
 		msleep(15);
 
 		algo_data->setscl(algo_data->data, 1);
-		for (j = 0; j < 10; j++) {
-			msleep(10);
-			if (algo_data->getscl(algo_data->data))
-				break;
+		if (algo_data->getscl) {
+			for (j = 0; j < 10; j++) {
+				msleep(10);
+				if (algo_data->getscl(algo_data->data))
+					break;
+			}
+		} else {
+			udelay(algo_data->udelay);
 		}
 
 		algo_data->setsda(algo_data->data, 1);