All of lore.kernel.org
 help / color / mirror / Atom feed
From: Tzung-Bi Shih <tzungbi@google.com>
To: ohad@wizery.com, bjorn.andersson@linaro.org
Cc: linux-remoteproc@vger.kernel.org, matthias.bgg@gmail.com,
	linux-mediatek@lists.infradead.org, mathieu.poirier@linaro.org,
	tzungbi@google.com
Subject: [PATCH v2] remoteproc/mediatek: enable MPU for all memory regions in MT8192 SCP
Date: Thu,  7 Jan 2021 10:30:20 +0800	[thread overview]
Message-ID: <20210107023020.3224002-1-tzungbi@google.com> (raw)

The register MT8192_CORE0_MEM_ATT_PREDEF contains attributes for each
memory region.  It defines whether a memory region can be managed by MPU
or not.

In the past, due to the default settings in the register, MT8192 SCP
works luckily.  After enabling L1TCM, SCP starts to access memory region
that is not included in the default settings.  As a result, SCP hangs.

Enables MPU for all memory regions in MT8192 SCP.

Note that the register is read only once when SCP resets.  Thus, it must
be set from kernel side.

Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
---
Changes from v1[1]:
- Adds more details in commit message.

[1]: https://patchwork.kernel.org/project/linux-remoteproc/patch/20201214051047.859110-1-tzungbi@google.com/ 

 drivers/remoteproc/mtk_common.h | 1 +
 drivers/remoteproc/mtk_scp.c    | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h
index 94bc54b224ee..5f7cd2336cef 100644
--- a/drivers/remoteproc/mtk_common.h
+++ b/drivers/remoteproc/mtk_common.h
@@ -47,6 +47,7 @@
 
 #define MT8192_CORE0_SW_RSTN_CLR	0x10000
 #define MT8192_CORE0_SW_RSTN_SET	0x10004
+#define MT8192_CORE0_MEM_ATT_PREDEF	0x10008
 #define MT8192_CORE0_WDT_CFG		0x10034
 
 #define SCP_FW_VER_LEN			32
diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
index f025aba67abc..130c0b9511df 100644
--- a/drivers/remoteproc/mtk_scp.c
+++ b/drivers/remoteproc/mtk_scp.c
@@ -369,6 +369,9 @@ static int mt8192_scp_before_load(struct mtk_scp *scp)
 	mt8192_power_on_sram(scp->reg_base + MT8192_L1TCM_SRAM_PDN);
 	mt8192_power_on_sram(scp->reg_base + MT8192_CPU0_SRAM_PD);
 
+	/* enable MPU for all memory regions */
+	writel(0xff, scp->reg_base + MT8192_CORE0_MEM_ATT_PREDEF);
+
 	return 0;
 }
 
-- 
2.29.2.729.g45daf8777d-goog


WARNING: multiple messages have this Message-ID (diff)
From: Tzung-Bi Shih <tzungbi@google.com>
To: ohad@wizery.com, bjorn.andersson@linaro.org
Cc: matthias.bgg@gmail.com, linux-mediatek@lists.infradead.org,
	linux-remoteproc@vger.kernel.org, mathieu.poirier@linaro.org,
	tzungbi@google.com
Subject: [PATCH v2] remoteproc/mediatek: enable MPU for all memory regions in MT8192 SCP
Date: Thu,  7 Jan 2021 10:30:20 +0800	[thread overview]
Message-ID: <20210107023020.3224002-1-tzungbi@google.com> (raw)

The register MT8192_CORE0_MEM_ATT_PREDEF contains attributes for each
memory region.  It defines whether a memory region can be managed by MPU
or not.

In the past, due to the default settings in the register, MT8192 SCP
works luckily.  After enabling L1TCM, SCP starts to access memory region
that is not included in the default settings.  As a result, SCP hangs.

Enables MPU for all memory regions in MT8192 SCP.

Note that the register is read only once when SCP resets.  Thus, it must
be set from kernel side.

Signed-off-by: Tzung-Bi Shih <tzungbi@google.com>
---
Changes from v1[1]:
- Adds more details in commit message.

[1]: https://patchwork.kernel.org/project/linux-remoteproc/patch/20201214051047.859110-1-tzungbi@google.com/ 

 drivers/remoteproc/mtk_common.h | 1 +
 drivers/remoteproc/mtk_scp.c    | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h
index 94bc54b224ee..5f7cd2336cef 100644
--- a/drivers/remoteproc/mtk_common.h
+++ b/drivers/remoteproc/mtk_common.h
@@ -47,6 +47,7 @@
 
 #define MT8192_CORE0_SW_RSTN_CLR	0x10000
 #define MT8192_CORE0_SW_RSTN_SET	0x10004
+#define MT8192_CORE0_MEM_ATT_PREDEF	0x10008
 #define MT8192_CORE0_WDT_CFG		0x10034
 
 #define SCP_FW_VER_LEN			32
diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
index f025aba67abc..130c0b9511df 100644
--- a/drivers/remoteproc/mtk_scp.c
+++ b/drivers/remoteproc/mtk_scp.c
@@ -369,6 +369,9 @@ static int mt8192_scp_before_load(struct mtk_scp *scp)
 	mt8192_power_on_sram(scp->reg_base + MT8192_L1TCM_SRAM_PDN);
 	mt8192_power_on_sram(scp->reg_base + MT8192_CPU0_SRAM_PD);
 
+	/* enable MPU for all memory regions */
+	writel(0xff, scp->reg_base + MT8192_CORE0_MEM_ATT_PREDEF);
+
 	return 0;
 }
 
-- 
2.29.2.729.g45daf8777d-goog


_______________________________________________
Linux-mediatek mailing list
Linux-mediatek@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-mediatek

             reply	other threads:[~2021-01-07  2:32 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-07  2:30 Tzung-Bi Shih [this message]
2021-01-07  2:30 ` [PATCH v2] remoteproc/mediatek: enable MPU for all memory regions in MT8192 SCP Tzung-Bi Shih
2021-01-07 21:50 ` Mathieu Poirier
2021-01-07 21:50   ` Mathieu Poirier

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210107023020.3224002-1-tzungbi@google.com \
    --to=tzungbi@google.com \
    --cc=bjorn.andersson@linaro.org \
    --cc=linux-mediatek@lists.infradead.org \
    --cc=linux-remoteproc@vger.kernel.org \
    --cc=mathieu.poirier@linaro.org \
    --cc=matthias.bgg@gmail.com \
    --cc=ohad@wizery.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.