On Wednesday 02 September 2015, Tomi Valkeinen wrote:
> On 24/08/15 22:37, Ondrej Zary wrote:
> > 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@xxxxxxxxxxxxxxxxxxxx>
> > Acked-by: Krzysztof Helt <krzysztof.h1@xxxxx>
> > ---
> > 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;
> > }
>
> Aren't both of those loops pointless if there's no getscl?
They're reduced to delays - don't know how much critical they are.
--
Ondrej Zary
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