Hi Marijn
Thanks for reviewing and testing the latest patchset.
On 2021-08-10 15:59, Marijn Suijten wrote:
Hi Abhinav,
On 7/16/21 2:01 AM, abhin...@codeaurora.org wrote:
Hi Marijn
Sorry for the late response.
Apologies from my side as well.
[...]
+static void msm_dsi_host_cmd_test_pattern_setup(struct msm_dsi_host
*msm_host)
+{
+ u32 reg;
+
+ reg = dsi_read(msm_host, REG_DSI_TEST_PATTERN_GEN_CTRL);
+
+ dsi_write(msm_host, REG_DSI_TEST_PATTERN_GEN_CMD_MDP_INIT_VAL0,
0xff);
+
+ reg |= (0x3 << 0x8);
+ dsi_write(msm_host, REG_DSI_TEST_PATTERN_GEN_CTRL, reg);
+ /* draw checkered rectangle pattern */
+ dsi_write(msm_host, REG_DSI_TPG_MAIN_CONTROL2, (0x1 << 0x7));
How about BIT(7)?
You mean BIT(7) of REG_DSI_TPG_MAIN_CONTROL2? Thats what this is
right?
Did you mean some other bit?
I meant to replace (0x1 << 0x7) with BIT(7), but replacing it with
DSI_TPG_MAIN_CONTROL2_CMD_MDP0_CHECKERED_RECTANGLE_PATTERN is even
better, thanks.
On SM6125 this seems to change the color intensity of the pattern; it
is always colored lines of a few pixels wide alternating R, B and G
from left to right. Is it possible to document the meaning and
available values of these registers, especially if they differ
between
SoC / DSI block?
I have requested access for SM6125, will check this register on that
to
see if there
is any difference.
Are you saying you are not seeing a rectangular checkered pattern
while
testing?
Correct. It's fixed now, and this patch already proves its
usefulness! We had two minor configuration issues, and are now seeing
the squares just like on the other SoCs. Meaning we can finally move
on to configuring the DPU, thanks!
Thats good to know !
Also are you testing on command mode or video mode?
Command mode, if it's still worth anything.
Thats good to know too, as I had not been able to test command mode.
As requested by Rob, I will add the bit definitions and update the
dsi.xml.h in the
next patchset for the registers and the bits which I am using here.
With that the meaning of these bits will be more clear.
I dont think I will be able to document all the bits because the goal
of
this patch
was only to draw a test pattern to help with validation. Different
bits
of the REG_DSI_TPG_MAIN_CONTROL2
register only draw different patterns so the goal wasnt that we can
draw
any pattern, it was just to
draw some pattern on the screen.
When we add support for all other patterns, we can expose those bits
as
well but it should not
be required in my opinion.
Understandable. I'm curious if other patterns are useful in certain
situations, like DSC? Other than that, knowing that the DSI and PHY
is correct is good enough for us.
The TPG in this patch is only for the DSI block which is after the DSC
block.
So any pattern we pick from the DSI_TPG_MAIN_CONTROL2 register (using
any other bit)
will only look different visually but will still be from DSI and no
other block.
So it will not help to validate DSC block individually.
Kind regards,
Marijn
+ DBG("Cmd test pattern setup done\n");
+}
[...]
Thanks!
Marijn
