Messages in this thread Patch in this message | | | From | Ondrej Zary <> | Subject | [PATCH 3/4] fb_ddc: Allow I2C adapters without SCL read capability | Date | Sat, 7 Feb 2015 21:53:36 +0100 |
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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> --- drivers/video/fbdev/core/fb_ddc.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)
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; } -- Ondrej Zary
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