diff options
| author |   Ondrej Zary <linux@rainbow-software.org> | 2015-09-25 00:14:13 +0200 |
|---|---|---|
| committer |   Tomi Valkeinen <tomi.valkeinen@ti.com> | 2015-09-30 10:46:55 +0300 |
| commit | ec90631c8a6861cdd752148fe19c20f775df47e7 (patch) | |
| tree | e15bfb1006d5434dad91bda921e35b14958c48db /drivers/video/fbdev/core | |
| parent | fbdev: ssd1307fb: add ssd1309 support (diff) | |
| download | wireguard-linux-ec90631c8a6861cdd752148fe19c20f775df47e7.tar.xz wireguard-linux-ec90631c8a6861cdd752148fe19c20f775df47e7.zip | |
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: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Diffstat (limited to 'drivers/video/fbdev/core')
| -rw-r--r-- | drivers/video/fbdev/core/fb_ddc.c | 28 |
1 files changed, 18 insertions, 10 deletions
diff --git a/drivers/video/fbdev/core/fb_ddc.c b/drivers/video/fbdev/core/fb_ddc.c index 94322ccfedde..8bf5f2f54be7 100644 --- a/drivers/video/fbdev/core/fb_ddc.c +++ b/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); |