[PATCH] media: aspeed: Fix incorrect resolution detected
jammy_huang at aspeedtech.com
Wed Nov 10 14:33:02 AEDT 2021
On 2021/11/9 下午 07:22, Paul Menzel wrote:
> Dear Jammy,
> Am 09.11.21 um 10:54 schrieb Jammy Huang:
>> During the process of os-installation, detected resolution's height
>> could be less than the correct one.
> Can you please elaborate? What OS? What resolution was and what
> resolution should have been detected?
My bad. This is the scenario our QA used to find this problem, but it
could happen in
any scenario with successive timing-change condition. I will update to
have a more
>> Increase min-required-count of stable signal to fix the problem.
> So you do two changes in the patch? First use the bitfield access
> macros, and then change VE_MODE_DT_HOR_STABLE and VE_MODE_DT_VER_STABLE
> from 6 to 10? Is that the amount of iterations? Why 10 and not 20?
> How much time do four iterations add?
VE_MODE_DT_HOR_STABLE means the min required count in detecting stable
HSYNC signal to set mode detection horizontal signal stable.
VE_MODE_DT_VER_STABLE means the min required count in detecting stable
VSYNC signal to set mode detection vertical signal stable.
How much time these iterations take varies by the input timing.
If VE_MODE_DT_VER_STABLE is 10, it means 10 successive stable vsync required
to make vertical signal stable flag raised. If the current timing is 60
fps, it will takes
at least 10/60 second.
The suggested min acceptable value for these two are 3 and max is 15.
> Sorry for my ignorance, but if you could make it two patches, that’d be
Sure, I will make it two patches in next update.
>> Fixes: d2b4387f3bdf ("media: platform: Add Aspeed Video Engine driver")
>> Signed-off-by: Jammy Huang <jammy_huang at aspeedtech.com>
>> drivers/media/platform/aspeed-video.c | 13 ++++++++++++-
>> 1 file changed, 12 insertions(+), 1 deletion(-)
>> diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c
>> index 5da52646b298..625a77ddb479 100644
>> --- a/drivers/media/platform/aspeed-video.c
>> +++ b/drivers/media/platform/aspeed-video.c
>> @@ -196,6 +196,12 @@
>> #define VE_INTERRUPT_VSYNC_DESC BIT(11)
>> #define VE_MODE_DETECT 0x30c
>> +#define VE_MODE_DT_HOR_TOLER GENMASK(31, 28)
>> +#define VE_MODE_DT_VER_TOLER GENMASK(27, 24)
>> +#define VE_MODE_DT_HOR_STABLE GENMASK(23, 20)
>> +#define VE_MODE_DT_VER_STABLE GENMASK(19, 16)
>> +#define VE_MODE_DT_EDG_THROD GENMASK(15, 8)
>> #define VE_MEM_RESTRICT_START 0x310
>> #define VE_MEM_RESTRICT_END 0x314
>> @@ -1199,7 +1205,12 @@ static void aspeed_video_init_regs(struct aspeed_video *video)
>> aspeed_video_write(video, VE_SCALING_FILTER3, 0x00200000);
>> /* Set mode detection defaults */
>> - aspeed_video_write(video, VE_MODE_DETECT, 0x22666500);
>> + aspeed_video_write(video, VE_MODE_DETECT,
>> + FIELD_PREP(VE_MODE_DT_HOR_TOLER, 2) |
>> + FIELD_PREP(VE_MODE_DT_VER_TOLER, 2) |
>> + FIELD_PREP(VE_MODE_DT_HOR_STABLE, 10) |
>> + FIELD_PREP(VE_MODE_DT_VER_STABLE, 10) |
>> + FIELD_PREP(VE_MODE_DT_EDG_THROD, 0x65));
>> aspeed_video_write(video, VE_BCD_CTRL, 0);
> Kind regards,
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