Re: i.MX6Q ldb after 2019.02

[Alexander Shiyan]

>Пятница, 13 ноября 2020, 12:15 +03:00 от gianluca <gianlucarenzi at eurek.it>:
>
>On 11/13/20 9:51 AM, Alexander Shiyan wrote:
>> Hello All.
>> 
>> I am having problems updating the barebox from version 2019.02 to version 2020.10.
>> The barebox i.MX6 CLK driver now uses several patches compared to the previous
>> version to fix the err009219 bug, and the display no more works as before.
>> I use a board based on i.MX6Q revision 1.2. With the old bootloader, the LVDS channel
>> is initialized and I can display the splash screen in the barebox. After loading the kernel,
>> everything works too.
>> I added source selection for LVDS channels and the kernel works with these additions.
>> &clks {
>> assigned-clocks = <&clks IMX6QDL_CLK_LDB_DI0_SEL>,
>>   <&clks IMX6QDL_CLK_LDB_DI0_SEL>;
>> assigned-clock-parents = <&clks IMX6QDL_CLK_PLL5_VIDEO_DIV>,
>>  <&clks IMX6QDL_CLK_PLL5_VIDEO_DIV>;
>> };
>> 
>> The splash screen in new version is not displayed in the barebox.
>> So, the question, what I do incorrect and how to fix this?
>> Old clk_dump:
>>      pll5_video (rate 716800008, enabled)
>>          pll5_post_div (rate 179200002, enabled)
>>              pll5_video_div (rate 44800001, enabled)
>>                  ldb_di0_sel (rate 44800001, enabled)
>>                      ldb_di0_div_3_5 (rate 12800000, enabled)
>>                          ldb_di0_podf (rate 6400000, enabled)
>>                              ipu1_di0_sel (rate 6400000, enabled)
>>                                  ipu1_di0 (rate 6400000, enabled)
>>                                      2400000.ipu at 2400000.of_di0_pixel (rate 6400000, enabled)
>>                              ldb_di0 (rate 6400000, enabled)
>> New:
>>      pll5_video (rate 716800008, enable_count: 1, unknown)
>>          pll5_post_div (rate 358400004, enable_count: 1, always enabled)
>This is a div2. Should be div4
>
>>              pll5_video_div (rate 179200002, enable_count: 1, always enabled)
>>                  ldb_di0_sel (rate 179200002, enable_count: 1, always enabled)
>>                      ldb_di0_div_3_5 (rate 51200000, enable_count: 1, always enabled)
>>                          ldb_di0_podf (rate 25600000, enable_count: 1, always enabled)
>>                              ipu1_di0_sel (rate 25600000, enable_count: 1, always enabled)
>>                                  ipu1_di0 (rate 25600000, enable_count: 1, enabled)
>>                                      2400000.ipu at 2400000.of_di0_pixel (rate 6400000, enable_count: 1, always enabled)
>>                              ldb_di0 (rate 25600000, enable_count: 0, enabled)
>> 
>> Can anyone help me to resolve this?
>
>Try to use pll5_post_div as div4 of the original pll5_video. All others 
>should be adapting correctly then.

With the help of the clk_set_rate, I achieved a complete frequency match for the old and new versions.
... But the screen is black and no splash is shown.

Thanks anyway!
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