[PATCH] remoteproc: qcom: q6v5-pil: fix modem hang on SDM845 after axis2 clk unvote

[PATCH] remoteproc: qcom: q6v5-pil: fix modem hang on SDM845 after axis2 clk unvote

[Sibi Sankar]

GCC_MSS_AXIS2 clock is used for disabling boot IMEM (a part of
AP boot up). With Boot IMEM disable now a part TZ/ATF, AXIS2
clock is no longer required post AP boot up and expected to
remain untouched. However if the clock is turned ON after Q6
is brought out of reset and later turned off, it results in
modem hang. When Q6 attempts a power collapse the internal
handshaking to check if AXIS2 is idle never goes through since
it is turned off preventing the RSC from getting triggered,
leaving modem in a funky state. Hence removing AXIS2 clk
enable/disable from the driver.

[bjorn: identified unvoting axis2 clk caused modem hang]
Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
---
 drivers/remoteproc/qcom_q6v5_pil.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/remoteproc/qcom_q6v5_pil.c b/drivers/remoteproc/qcom_q6v5_pil.c
index e04319573c91..d7a4b9eca5d2 100644
--- a/drivers/remoteproc/qcom_q6v5_pil.c
+++ b/drivers/remoteproc/qcom_q6v5_pil.c
@@ -1243,7 +1243,6 @@ static const struct rproc_hexagon_res sdm845_mss = {
 	.hexagon_mba_image = "mba.mbn",
 	.proxy_clk_names = (char*[]){
 			"xo",
-			"axis2",
 			"prng",
 			NULL
 	},
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

Re: [PATCH] remoteproc: qcom: q6v5-pil: fix modem hang on SDM845 after axis2 clk unvote

[Bjorn Andersson]

On Mon 09 Jul 08:12 PDT 2018, Sibi Sankar wrote:

> GCC_MSS_AXIS2 clock is used for disabling boot IMEM (a part of
> AP boot up). With Boot IMEM disable now a part TZ/ATF, AXIS2
> clock is no longer required post AP boot up and expected to
> remain untouched. However if the clock is turned ON after Q6
> is brought out of reset and later turned off, it results in
> modem hang. When Q6 attempts a power collapse the internal
> handshaking to check if AXIS2 is idle never goes through since
> it is turned off preventing the RSC from getting triggered,
> leaving modem in a funky state. Hence removing AXIS2 clk
> enable/disable from the driver.
> 
> [bjorn: identified unvoting axis2 clk caused modem hang]
> Signed-off-by: Sibi Sankar <sibis@codeaurora.org>

Thanks Sibi

Regards,
Bjorn

> ---
>  drivers/remoteproc/qcom_q6v5_pil.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/remoteproc/qcom_q6v5_pil.c b/drivers/remoteproc/qcom_q6v5_pil.c
> index e04319573c91..d7a4b9eca5d2 100644
> --- a/drivers/remoteproc/qcom_q6v5_pil.c
> +++ b/drivers/remoteproc/qcom_q6v5_pil.c
> @@ -1243,7 +1243,6 @@ static const struct rproc_hexagon_res sdm845_mss = {
>  	.hexagon_mba_image = "mba.mbn",
>  	.proxy_clk_names = (char*[]){
>  			"xo",
> -			"axis2",
>  			"prng",
>  			NULL
>  	},
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>