linux-kernel - [PATCH v2 3/4] media: rkvdec: Re-enable H.264 error detection

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Date:   Fri, 23 Dec 2022 14:38:05 -0500
From:   Nicolas Dufresne <nicolas.dufresne@...labora.com>
To:     Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     kernel@...labora.com,
        Nicolas Dufresne <nicolas.dufresne@...labora.com>,
        linux-media@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/4] media: rkvdec: Re-enable H.264 error detection

This re-enable H.264 error detection, but using the other error mode.
In that mode, the decoder will skip over the error macro-block or
slices and complete the decoding. As a side effect, the error status
is not set in the interrupt status register, and instead errors are
detected per format. Using this mode workaround the issue that the
HW get stuck in error state, and allow reporting that some corruption
may be present in the buffer to userland.

Signed-off-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>
---
 drivers/staging/media/rkvdec/rkvdec-h264.c | 23 +++++++++++++++++++---
 1 file changed, 20 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/media/rkvdec/rkvdec-h264.c b/drivers/staging/media/rkvdec/rkvdec-h264.c
index 4fc167b42cf0c..dfe3e235f099a 100644
--- a/drivers/staging/media/rkvdec/rkvdec-h264.c
+++ b/drivers/staging/media/rkvdec/rkvdec-h264.c
@@ -1162,14 +1162,15 @@ static int rkvdec_h264_run(struct rkvdec_ctx *ctx)
 
 	schedule_delayed_work(&rkvdec->watchdog_work, msecs_to_jiffies(2000));
 
-	writel(0, rkvdec->regs + RKVDEC_REG_STRMD_ERR_EN);
-	writel(0, rkvdec->regs + RKVDEC_REG_H264_ERR_E);
+	writel(0xffffffff, rkvdec->regs + RKVDEC_REG_STRMD_ERR_EN);
+	writel(0xffffffff, rkvdec->regs + RKVDEC_REG_H264_ERR_E);
 	writel(1, rkvdec->regs + RKVDEC_REG_PREF_LUMA_CACHE_COMMAND);
 	writel(1, rkvdec->regs + RKVDEC_REG_PREF_CHR_CACHE_COMMAND);
 
 	/* Start decoding! */
 	writel(RKVDEC_INTERRUPT_DEC_E | RKVDEC_CONFIG_DEC_CLK_GATE_E |
-	       RKVDEC_TIMEOUT_E | RKVDEC_BUF_EMPTY_E,
+	       RKVDEC_TIMEOUT_E | RKVDEC_BUF_EMPTY_E |
+	       RKVDEC_H264ORVP9_ERR_MODE,
 	       rkvdec->regs + RKVDEC_REG_INTERRUPT);
 
 	return 0;
@@ -1183,10 +1184,26 @@ static int rkvdec_h264_try_ctrl(struct rkvdec_ctx *ctx, struct v4l2_ctrl *ctrl)
 	return 0;
 }
 
+static int rkvdec_h264_check_error_info(struct rkvdec_ctx *ctx)
+{
+	struct rkvdec_dev *rkvdec = ctx->dev;
+	int err;
+
+	err = readl(rkvdec->regs + RKVDEC_REG_H264_ERRINFO_NUM);
+	if (err & RKVDEC_STRMD_DECT_ERR_FLAG) {
+		pr_debug("Decoded picture have %i/%i slices with errors.\n",
+			 RKVDEC_ERR_PKT_NUM(err), RKVDEC_SLICEDEC_NUM(err));
+		return VB2_BUF_STATE_ERROR;
+	}
+
+	return VB2_BUF_STATE_DONE;
+}
+
 const struct rkvdec_coded_fmt_ops rkvdec_h264_fmt_ops = {
 	.adjust_fmt = rkvdec_h264_adjust_fmt,
 	.start = rkvdec_h264_start,
 	.stop = rkvdec_h264_stop,
 	.run = rkvdec_h264_run,
 	.try_ctrl = rkvdec_h264_try_ctrl,
+	.check_error_info = rkvdec_h264_check_error_info,
 };
-- 
2.38.1