linux-kernel - [PATCH v3] media: mtk-vpu: Ensure alignment of 8 for DTCM buffer

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Message-Id: <20210825101717.18075-1-dafna.hirschfeld@collabora.com>
Date:   Wed, 25 Aug 2021 12:17:17 +0200
From:   Dafna Hirschfeld <dafna.hirschfeld@...labora.com>
To:     linux-media@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Cc:     Alexandre Courbot <acourbot@...omium.org>,
        dafna.hirschfeld@...labora.com, kernel@...labora.com,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        hverkuil@...all.nl, dafna3@...il.com, mchehab@...nel.org,
        tfiga@...omium.org, minghsiu.tsai@...iatek.com,
        houlong.wei@...iatek.com, andrew-ct.chen@...iatek.com,
        tiffany.lin@...iatek.com, matthias.bgg@...il.com,
        courbot@...omium.org, hsinyi@...omium.org, eizan@...omium.org
Subject: [PATCH v3] media: mtk-vpu: Ensure alignment of 8 for DTCM buffer

From: Alexandre Courbot <acourbot@...omium.org>

When running memcpy_toio:
memcpy_toio(send_obj->share_buf, buf, len);
it was found that errors appear if len is not a multiple of 8:

[58.350841] mtk-mdp 14001000.rdma: processing failed: -22

This patch ensures the copy of a multile of 8 size by calling
round_up(len, 8) when copying

Fixes: e6599adfad30 ("media: mtk-vpu: avoid unaligned access to DTCM buffer.")
Signed-off-by: Alexandre Courbot <acourbot@...omium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
Signed-off-by: Dafna Hirschfeld <dafna.hirschfeld@...labora.com>
---
changes since v2:
1. do the extra copy only if len is not multiple of 8

changes since v1:
1. change sign-off-by tags
2. change values to memset

 drivers/media/platform/mtk-vpu/mtk_vpu.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/mtk-vpu/mtk_vpu.c b/drivers/media/platform/mtk-vpu/mtk_vpu.c
index ec290dde59cf..658161ee3e4e 100644
--- a/drivers/media/platform/mtk-vpu/mtk_vpu.c
+++ b/drivers/media/platform/mtk-vpu/mtk_vpu.c
@@ -349,7 +349,16 @@ int vpu_ipi_send(struct platform_device *pdev,
 		}
 	} while (vpu_cfg_readl(vpu, HOST_TO_VPU));
 
-	memcpy_toio(send_obj->share_buf, buf, len);
+	if (len % 8 != 0) {
+		unsigned char data[SHARE_BUF_SIZE];
+
+		memset(data + len, 0, sizeof(data) - len);
+		memcpy(data, buf, len);
+		memcpy_toio(send_obj->share_buf, data, round_up(len, 8));
+	} else {
+		memcpy_toio(send_obj->share_buf, buf, len);
+	}
+
 	writel(len, &send_obj->len);
 	writel(id, &send_obj->id);
 
-- 
2.17.1