On 2021-01-13 12:23, Stephen Boyd wrote:
Quoting khsieh@xxxxxxxxxxxxxx (2021-01-13 09:48:25)
On 2021-01-11 11:54, Stephen Boyd wrote:
> Quoting Kuogee Hsieh (2021-01-07 12:30:25)
>> There is HPD unplug interrupts missed at scenario of an irq_hpd
>> followed by unplug interrupts with around 10 ms in between.
>> Since both AUX_SW_RESET and DP_SW_RESET clear pending HPD interrupts,
>> irq_hpd handler should not issues either aux or sw reset to avoid
>> following unplug interrupt be cleared accidentally.
>
> So the problem is that we're resetting the DP aux phy in the middle of
> the HPD state machine transitioning states?
>
yes, after reset aux, hw clear pending hpd interrupts
>>
>> Signed-off-by: Kuogee Hsieh <khsieh@xxxxxxxxxxxxxx>
>> ---
>> diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.c
>> b/drivers/gpu/drm/msm/dp/dp_catalog.c
>> index 44f0c57..9c0ce98 100644
>> --- a/drivers/gpu/drm/msm/dp/dp_catalog.c
>> +++ b/drivers/gpu/drm/msm/dp/dp_catalog.c
>> @@ -190,6 +190,18 @@ int dp_catalog_aux_clear_hw_interrupts(struct
>> dp_catalog *dp_catalog)
>> return 0;
>> }
>>
>> +/**
>> + * dp_catalog_aux_reset() - reset AUX controller
>> + *
>> + * @aux: DP catalog structure
>> + *
>> + * return: void
>> + *
>> + * This function reset AUX controller
>> + *
>> + * NOTE: reset AUX controller will also clear any pending HPD related
>> interrupts
>> + *
>> + */
>> void dp_catalog_aux_reset(struct dp_catalog *dp_catalog)
>> {
>> u32 aux_ctrl;
>> @@ -483,6 +495,18 @@ int dp_catalog_ctrl_set_pattern(struct dp_catalog
>> *dp_catalog,
>> return 0;
>> }
>>
>> +/**
>> + * dp_catalog_ctrl_reset() - reset DP controller
>> + *
>> + * @aux: DP catalog structure
>
> It's called dp_catalog though.
registers access are through dp_catalog_xxxx
Agreed. The variable is not called 'aux' though, it's called
'dp_catalog'.
>
>> + *
>> + * return: void
>> + *
>> + * This function reset DP controller
>
> resets the
>
>> + *
>> + * NOTE: reset DP controller will also clear any pending HPD related
>> interrupts
>> + *
>> + */
>> void dp_catalog_ctrl_reset(struct dp_catalog *dp_catalog)
Right here.
fixed at v2
>> {
>> u32 sw_reset;
>> diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c
>> b/drivers/gpu/drm/msm/dp/dp_ctrl.c
>> index e3462f5..f96c415 100644
>> --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
>> +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c
>> @@ -1296,7 +1296,8 @@ static int dp_ctrl_setup_main_link(struct
>> dp_ctrl_private *ctrl,
>> * transitioned to PUSH_IDLE. In order to start transmitting
>> * a link training pattern, we have to first do soft reset.
>> */
>> - dp_catalog_ctrl_reset(ctrl->catalog);
>> + if (*training_step != DP_TRAINING_NONE)
>
> Can we check for the positive value instead? i.e.
> DP_TRAINING_1/DP_TRAINING_2
>
Any answer?
fixed at v2
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