Am 05.02.2013 23:48, schrieb Mauro Carvalho Chehab:
> Em Sun, 20 Jan 2013 14:26:47 +0100
> Frank Schäfer <fschaefer....@googlemail.com> escreveu:
>
>> - move the bit shifting of width+height values inside the function
>> - fix the debug message format and output values
>> - add comment about the size limit (e.g. EM277x supports >2MPix)
>> - make void, because error checking is incomplete and we never check the
>> returned value (we would continue anyway)
>>
>> Signed-off-by: Frank Schäfer <fschaefer....@googlemail.com>
>> ---
>> drivers/media/usb/em28xx/em28xx-core.c | 22 ++++++++++++----------
>> 1 Datei geändert, 12 Zeilen hinzugefügt(+), 10 Zeilen entfernt(-)
>>
>> diff --git a/drivers/media/usb/em28xx/em28xx-core.c
>> b/drivers/media/usb/em28xx/em28xx-core.c
>> index 210859a..f516a63 100644
>> --- a/drivers/media/usb/em28xx/em28xx-core.c
>> +++ b/drivers/media/usb/em28xx/em28xx-core.c
>> @@ -733,22 +733,24 @@ static int em28xx_accumulator_set(struct em28xx *dev,
>> u8 xmin, u8 xmax,
>> return em28xx_write_regs(dev, EM28XX_R2B_YMAX, &ymax, 1);
>> }
>>
>> -static int em28xx_capture_area_set(struct em28xx *dev, u8 hstart, u8 vstart,
>> +static void em28xx_capture_area_set(struct em28xx *dev, u8 hstart, u8
>> vstart,
>> u16 width, u16 height)
>> {
>> - u8 cwidth = width;
>> - u8 cheight = height;
>> - u8 overflow = (height >> 7 & 0x02) | (width >> 8 & 0x01);
>> + u8 cwidth = width >> 2;
>> + u8 cheight = height >> 2;
>> + u8 overflow = (height >> 9 & 0x02) | (width >> 10 & 0x01);
> Hmm.. why did you change the above overflow bits?
Read the complete patch, the answer is...
...
> That change doesn't
> sound right to me. Ok, I don't have the datasheets, so I might be
> wrong, but if is there a bug there, please submit the bug fix into a
> separate patch, clearly explaining why such change is needed.
>
>> + /* NOTE: size limit: 2047x1023 = 2MPix */
>>
>> - em28xx_coredbg("em28xx Area Set: (%d,%d)\n",
>> - (width | (overflow & 2) << 7),
>> - (height | (overflow & 1) << 8));
>> + em28xx_coredbg("capture area set to (%d,%d): %dx%d\n",
>> + hstart, vstart,
>> + ((overflow & 2) << 9 | cwidth << 2),
>> + ((overflow & 1) << 10 | cheight << 2));
>>
>> em28xx_write_regs(dev, EM28XX_R1C_HSTART, &hstart, 1);
>> em28xx_write_regs(dev, EM28XX_R1D_VSTART, &vstart, 1);
>> em28xx_write_regs(dev, EM28XX_R1E_CWIDTH, &cwidth, 1);
>> em28xx_write_regs(dev, EM28XX_R1F_CHEIGHT, &cheight, 1);
>> - return em28xx_write_regs(dev, EM28XX_R1B_OFLOW, &overflow, 1);
>> + em28xx_write_regs(dev, EM28XX_R1B_OFLOW, &overflow, 1);
>> }
>>
>> static int em28xx_scaler_set(struct em28xx *dev, u16 h, u16 v)
>> @@ -801,9 +803,9 @@ int em28xx_resolution_set(struct em28xx *dev)
>> it out, we end up with the same format as the rest of the VBI
>> region */
>> if (em28xx_vbi_supported(dev) == 1)
>> - em28xx_capture_area_set(dev, 0, 2, width >> 2, height >> 2);
>> + em28xx_capture_area_set(dev, 0, 2, width, height);
>> else
>> - em28xx_capture_area_set(dev, 0, 0, width >> 2, height >> 2);
>> + em28xx_capture_area_set(dev, 0, 0, width, height);
... here !
So it's not a real change.
Regards,
Frank
>>
>> return em28xx_scaler_set(dev, dev->hscale, dev->vscale);
>> }
--
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