Hi Qingwei,
You can try with the virtual Frame buffer first to see if the changes is
effect or not.
Just use the VFB to transfer the display from your board to your Linux
desktop over Ethernet, on Linux desktop you can use some vnc client to view.
If the changes take effect then it should be the problem with your display
driver.
I don't know if there is other ways to implement it, but I think swap R and
B in display driver is the easiest way.
Regards,
Tung
On Fri, Sep 9, 2011 at 1:58 PM, <lqw1...@gmail.com> wrote:
> Hi Tung,
>
> Thank you!
>
> I have ever done the similar thing with our FB driver, but it did not take
> effect. Maybe our platform made some special changes, or driver has bugs.
> I’ll check them carefully.
>
> BTW, I wonder if there is another way to implement, e.g. modify fbmem.c or
> other files.
>
> Best regards,
> Qingwei
>
> *From:* Tung Dang <tung...@gmail.com>
> *Sent:* Friday, September 09, 2011 1:19 PM
> *To:* lqw1...@gmail.com
> *Cc:* android-porting <android-porting@googlegroups.com>
> *Subject:* Re: [android-porting] i.MX51 BBG: How to swap red color with
> blue on DISP2 (RGB565 -> BGR565)
>
> Hi QingWei,
>
> Last time I tried to swap the color on Android VNC Server, which use the
> virtual frame buffer driver in kernel/drivers/video/vfb.c
> In your case, you should do the same with your FB driver. You should check
> your kernel boot parameter also, to make sure the input setting for your
> Video Output is RGB565.
> But last time I did on Android 2.2, I am not very sure what has been
> changed with the display mechanism on new Android.
>
> <<kernel/drivers/video/vfb.c>>
>
> static int vfb_check_var(struct fb_var_screeninfo *var,
> struct fb_info *info)
> {
> u_long line_length;
>
> /*
> * FB_VMODE_CONUPDATE and FB_VMODE_SMOOTH_XPAN are equal!
> * as FB_VMODE_SMOOTH_XPAN is only used internally
> */
>
> if (var->vmode & FB_VMODE_CONUPDATE) {
> var->vmode |= FB_VMODE_YWRAP;
> var->xoffset = info->var.xoffset;
> var->yoffset = info->var.yoffset;
> }
>
> /*
> * Some very basic checks
> */
> if (!var->xres)
> var->xres = 1;
> if (!var->yres)
> var->yres = 1;
> if (var->xres > var->xres_virtual)
> var->xres_virtual = var->xres;
> if (var->yres > var->yres_virtual)
> var->yres_virtual = var->yres;
> if (var->bits_per_pixel <= 1)
> var->bits_per_pixel = 1;
> else if (var->bits_per_pixel <= 8)
> var->bits_per_pixel = 8;
> else if (var->bits_per_pixel <= 16)
> var->bits_per_pixel = 16;
> else if (var->bits_per_pixel <= 24)
> var->bits_per_pixel = 24;
> else if (var->bits_per_pixel <= 32)
> var->bits_per_pixel = 32;
> else
> return -EINVAL;
>
> if (var->xres_virtual < var->xoffset + var->xres)
> var->xres_virtual = var->xoffset + var->xres;
> if (var->yres_virtual < var->yoffset + var->yres)
> var->yres_virtual = var->yoffset + var->yres;
>
> /*
> * Memory limit
> */
> line_length =
> get_line_length(var->xres_virtual, var->bits_per_pixel);
> if (line_length * var->yres_virtual > videomemorysize)
> return -ENOMEM;
>
> /*
> * Now that we checked it we alter var. The reason being is that the
> video
> * mode passed in might not work but slight changes to it might make it
>
> * work. This way we let the user know what is acceptable.
> */
> switch (var->bits_per_pixel) {
> case 1:
> case 8:
> var->red.offset = 0;
> var->red.length = 8;
> var->green.offset = 0;
> var->green.length = 8;
> var->blue.offset = 0;
> var->blue.length = 8;
> var->transp.offset = 0;
> var->transp.length = 0;
> break;
> case 16: /* RGBA 5551 */
> if (var->transp.length) {
> var->red.offset = 0;
> var->red.length = 5;
> var->green.offset = 5;
> var->green.length = 5;
> var->blue.offset = 10;
> var->blue.length = 5;
> var->transp.offset = 15;
> var->transp.length = 1;
> } else { /* RGB 565 */
> var->red.offset = 0; /* => modify to 11 */
> var->red.length = 5;
> var->green.offset = 5;
> var->green.length = 6;
> var->blue.offset = 11; /* => modify to 0 */
> var->blue.length = 5;
> var->transp.offset = 0;
> var->transp.length = 0;
> }
> break;
> case 24: /* RGB 888 */
> var->red.offset = 0;
> var->red.length = 8;
> var->green.offset = 8;
> var->green.length = 8;
> var->blue.offset = 16;
> var->blue.length = 8;
> var->transp.offset = 0;
> var->transp.length = 0;
> break;
> case 32: /* RGBA 8888 */
> var->red.offset = 0;
> var->red.length = 8;
> var->green.offset = 8;
> var->green.length = 8;
> var->blue.offset = 16;
> var->blue.length = 8;
> var->transp.offset = 24;
> var->transp.length = 8;
> break;
> }
> var->red.msb_right = 0;
> var->green.msb_right = 0;
> var->blue.msb_right = 0;
> var->transp.msb_right = 0;
>
> return 0;
> }
>
> Regards,
> Tung
>
> On Fri, Sep 9, 2011 at 9:48 AM, <lqw1...@gmail.com> wrote:
>
>> Hi, Dang,
>>
>> We’re using driver/video/mxc/mxc_ipuv3_fb.c as framebuffer driver, and I
>> think the only thing I should do is modify check_var to re-define
>> fb_bitfield, right?
>>
>> Or I should modify other file? Could you please give a example or further
>> tips?
>>
>> Thanks a lot!
>>
>> BR,
>> Qingwei
>>
>> *From:* Tung Dang <tung...@gmail.com>
>> *Sent:* Friday, September 09, 2011 8:42 AM
>> *To:* lqw1...@gmail.com
>> *Cc:* android-porting <android-porting@googlegroups.com>
>> *Subject:* Re: [android-porting] i.MX51 BBG: How to swap red color with
>> blue on DISP2 (RGB565 -> BGR565)
>>
>> Hi Qingwei,
>>
>> The correct way is to modify in your frame buffer display driver , just
>> swap between B and R
>> The frame buffer display driver is in your linux kernel driver
>> /linux-xxx/drivers/video
>>
>> Regards,
>> Tung
>>
>> On Thu, Sep 8, 2011 at 8:43 PM, <lqw1...@gmail.com> wrote:
>>
>>> Hi,
>>>
>>> Now I have to use BGR565 instead of RGB565, so I modified following
>>> codes, but they have no effect.
>>> file:
>>> mxc_ipuv3_fb.c, function: mxcfb_check_var
>>> ......
>>> switch
>>> (var->bits_per_pixel) {
>>> case 8:
>>> ......
>>> break;
>>> case 16:
>>> var->red.length = 5;
>>> var->red.offset = 11; ----> 0
>>> var->red.msb_right = 0;
>>> var->green.length = 6;
>>> var->green.offset = 5;
>>> var->green.msb_right = 0;
>>> var->blue.length = 5;
>>> var->blue.offset = 0; ---->11
>>> var->blue.msb_right = 0;
>>> ......
>>> break;
>>> case 24:
>>> ......
>>>
>>> And then, I modified _ipu_ch_params_set_packing in
>>> drivers/mxc/ipu3/ipu_param_**mem.h, and found the color of UI is
>>> correct, but camera preview/taking photo/recording, video playing are not
>>> correct (R and B color are reversed).
>>>
>>> I think the best way is to modify framebuffer, but I don’t know how to
>>> do.
>>>
>>> Does anyone have some ideas?
>>>
>>> BR,
>>> Qingwei
>>>
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>>
>>
>
>
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