The driver stores crop rectangle settings supposed to be in line with hardware state in a device private structure. Since the driver initial submission, crop rectangle width and height settings are not updated correctly when rectangle offset settings are applied on hardware. If an error occurs while the device is updated, the stored settings my no longer reflect hardware state and consecutive calls to .get_selection() as well as .get_fmt() may return incorrect information. That in turn may affect ability of a host device to use correct DMA transfer settings if such incorrect informamtion on active frame format returned by .get_fmt() is used.
Assuming a failed update of the device means its actual settings haven't changed, update crop rectangle width and height settings stored in the device private structure correctly while the rectangle offset is successfully applied on hardware so the stored values always reflect actual hardware state to the extent possible.
Fixes: 2f6e2404799a ("[media] SoC Camera: add driver for OV6650 sensor") Signed-off-by: Janusz Krzysztofik jmkrzyszt@gmail.com Cc: stable@vger.kernel.org --- drivers/media/i2c/ov6650.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/media/i2c/ov6650.c b/drivers/media/i2c/ov6650.c index 001457d39742..cffe6aa906b2 100644 --- a/drivers/media/i2c/ov6650.c +++ b/drivers/media/i2c/ov6650.c @@ -500,6 +500,7 @@ static int ov6650_set_selection(struct v4l2_subdev *sd,
ret = ov6650_reg_write(client, REG_HSTRT, sel->r.left >> 1); if (!ret) { + priv->rect.width += priv->rect.left - sel->r.left; priv->rect.left = sel->r.left; ret = ov6650_reg_write(client, REG_HSTOP, (sel->r.left + sel->r.width) >> 1); @@ -509,6 +510,7 @@ static int ov6650_set_selection(struct v4l2_subdev *sd, ret = ov6650_reg_write(client, REG_VSTRT, sel->r.top >> 1); } if (!ret) { + priv->rect.height += priv->rect.top - sel->r.top; priv->rect.top = sel->r.top; ret = ov6650_reg_write(client, REG_VSTOP, (sel->r.top + sel->r.height) >> 1);