[v4,1/2] drm/msm/dp: do not complete dp_aux_cmd_fifo_tx() if irq is not for aux transfer

There are 3 possible interrupt sources are handled by DP controller,
HPDstatus, Controller state changes and Aux read/write transaction.
At every irq, DP controller have to check isr status of every interrupt
sources and service the interrupt if its isr status bits shows interrupts
are pending. There is potential race condition may happen at current aux
isr handler implementation since it is always complete dp_aux_cmd_fifo_tx()
even irq is not for aux read or write transaction. This may cause aux read
transaction return premature if host aux data read is in the middle of
waiting for sink to complete transferring data to host while irq happen.
This will cause host's receiving buffer contains unexpected data. This
patch fixes this problem by checking aux isr and return immediately at
aux isr handler if there are no any isr status bits set.

Current there is a bug report regrading eDP edid corruption happen during
system booting up. After lengthy debugging to found that that VIDEO_READY
interrupt was continuously firing during system booting up which cause
dp_aux_isr() to complete dp_aux_cmd_fifo_tx() prematurely to retrieve data
from aux hardware buffer which is not yet contains complete data transfer
from sink. This cause edid corruption.

Follows are the signature at kernel logs when problem happen,
EDID has corrupt header
panel-simple-dp-aux aux-aea0000.edp: Couldn't identify panel via EDID
panel-simple-dp-aux aux-aea0000.edp: error -EIO: Couldn't detect panel nor find a fallback

Changes in v2:
-- do complete if (ret == IRQ_HANDLED) ay dp-aux_isr()
-- add more commit text

Changes in v3:
-- add Stephen suggested
-- dp_aux_isr() return IRQ_XXX back to caller
-- dp_ctrl_isr() return IRQ_XXX back to caller

Changes in v4:
-- split into two patches

Fixes: c943b4948b58 ("drm/msm/dp: add displayPort driver support")

Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
Tested-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
---
 drivers/gpu/drm/msm/dp/dp_aux.c | 4 ++++
 1 file changed, 4 insertions(+)

On Fri, 16 Dec 2022 at 00:53, Kuogee Hsieh <quic_khsieh@quicinc.com> wrote:
>
> There are 3 possible interrupt sources are handled by DP controller,
> HPDstatus, Controller state changes and Aux read/write transaction.
> At every irq, DP controller have to check isr status of every interrupt
> sources and service the interrupt if its isr status bits shows interrupts
> are pending. There is potential race condition may happen at current aux
> isr handler implementation since it is always complete dp_aux_cmd_fifo_tx()
> even irq is not for aux read or write transaction. This may cause aux read
> transaction return premature if host aux data read is in the middle of
> waiting for sink to complete transferring data to host while irq happen.
> This will cause host's receiving buffer contains unexpected data. This
> patch fixes this problem by checking aux isr and return immediately at
> aux isr handler if there are no any isr status bits set.
>
> Current there is a bug report regrading eDP edid corruption happen during
> system booting up. After lengthy debugging to found that that VIDEO_READY
> interrupt was continuously firing during system booting up which cause
> dp_aux_isr() to complete dp_aux_cmd_fifo_tx() prematurely to retrieve data
> from aux hardware buffer which is not yet contains complete data transfer
> from sink. This cause edid corruption.
>
> Follows are the signature at kernel logs when problem happen,
> EDID has corrupt header
> panel-simple-dp-aux aux-aea0000.edp: Couldn't identify panel via EDID
> panel-simple-dp-aux aux-aea0000.edp: error -EIO: Couldn't detect panel nor find a fallback
>
> Changes in v2:
> -- do complete if (ret == IRQ_HANDLED) ay dp-aux_isr()
> -- add more commit text
>
> Changes in v3:
> -- add Stephen suggested
> -- dp_aux_isr() return IRQ_XXX back to caller
> -- dp_ctrl_isr() return IRQ_XXX back to caller
>
> Changes in v4:
> -- split into two patches
>
> Fixes: c943b4948b58 ("drm/msm/dp: add displayPort driver support")
>

The same feedback as the one I gave for v2 or v3:

There should be no empty lines between tags. And you still have one
empty line here.

With that fixed:

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

> Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
> Tested-by: Douglas Anderson <dianders@chromium.org>
> Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
> ---
>  drivers/gpu/drm/msm/dp/dp_aux.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/drivers/gpu/drm/msm/dp/dp_aux.c b/drivers/gpu/drm/msm/dp/dp_aux.c
> index d030a93..cc3efed 100644
> --- a/drivers/gpu/drm/msm/dp/dp_aux.c
> +++ b/drivers/gpu/drm/msm/dp/dp_aux.c
> @@ -423,6 +423,10 @@ void dp_aux_isr(struct drm_dp_aux *dp_aux)
>
>         isr = dp_catalog_aux_get_irq(aux->catalog);
>
> +       /* no interrupts pending, return immediately */
> +       if (!isr)
> +               return;
> +
>         if (!aux->cmd_busy)
>                 return;
>
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>