linux-kernel - [PATCH v5 3/4] media: venus: Update to bitrate based clock scaling

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Date:   Tue, 16 Jul 2019 10:39:13 +0530
From:   Aniket Masule <amasule@...eaurora.org>
To:     linux-media@...r.kernel.org, stanimir.varbanov@...aro.org
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        vgarodia@...eaurora.org, Aniket Masule <amasule@...eaurora.org>
Subject: [PATCH v5 3/4] media: venus: Update to bitrate based clock scaling

Introduced clock scaling using bitrate, preavious
calculations consider only the cycles per mb.
Also, clock scaling is now triggered before every
buffer being queued to the device. This helps in
deciding precise clock cycles required.

Signed-off-by: Aniket Masule <amasule@...eaurora.org>
---
 drivers/media/platform/qcom/venus/helpers.c | 33 +++++++++++++++++++++++++----
 1 file changed, 29 insertions(+), 4 deletions(-)

diff --git a/drivers/media/platform/qcom/venus/helpers.c b/drivers/media/platform/qcom/venus/helpers.c
index 2c976e4..edf403d 100644
--- a/drivers/media/platform/qcom/venus/helpers.c
+++ b/drivers/media/platform/qcom/venus/helpers.c
@@ -399,17 +399,26 @@ static int scale_clocks(struct venus_inst *inst)
 	return ret;
 }
 
-static unsigned long calculate_vpp_freq(struct venus_inst *inst)
+static unsigned long calculate_inst_freq(struct venus_inst *inst,
+					 unsigned long filled_len)
 {
-	unsigned long vpp_freq = 0;
+	unsigned long vpp_freq = 0, vsp_freq = 0;
+	u64 fps = inst->fps;
 	u32 mbs_per_sec;
 
 	mbs_per_sec = load_per_instance(inst);
 	vpp_freq = mbs_per_sec * inst->clk_data.codec_freq_data->vpp_freq;
 	/* 21 / 20 is overhead factor */
 	vpp_freq += vpp_freq / 20;
+	vsp_freq = mbs_per_sec * inst->clk_data.codec_freq_data->vsp_freq;
 
-	return vpp_freq;
+	/* 10 / 7 is overhead factor */
+	if (inst->session_type == VIDC_SESSION_TYPE_ENC)
+		vsp_freq += (inst->controls.enc.bitrate * 10) / 7;
+	else
+		vsp_freq += ((fps * filled_len * 8) * 10) / 7;
+
+	return max(vpp_freq, vsp_freq);
 }
 
 static int scale_clocks_v4(struct venus_inst *inst)
@@ -417,13 +426,27 @@ static int scale_clocks_v4(struct venus_inst *inst)
 	struct venus_core *core = inst->core;
 	const struct freq_tbl *table = core->res->freq_tbl;
 	unsigned int num_rows = core->res->freq_tbl_size;
+	struct v4l2_m2m_ctx *m2m_ctx = inst->m2m_ctx;
 	struct clk *clk = core->clks[0];
 	struct device *dev = core->dev;
 	unsigned int i;
 	unsigned long freq = 0, freq_core1 = 0, freq_core2 = 0;
+	unsigned long filled_len = 0;
+	struct venus_buffer *buf, *n;
+	struct vb2_buffer *vb;
 	int ret;
 
-	freq = calculate_vpp_freq(inst);
+	mutex_lock(&inst->lock);
+	v4l2_m2m_for_each_src_buf_safe(m2m_ctx, buf, n) {
+		vb = &buf->vb.vb2_buf;
+		filled_len = max(filled_len, vb2_get_plane_payload(vb, 0));
+	}
+	mutex_unlock(&inst->lock);
+
+	if (inst->session_type == VIDC_SESSION_TYPE_DEC && !filled_len)
+		return 0;
+
+	freq = calculate_inst_freq(inst, filled_len);
 
 	if (freq > table[0].freq)
 		dev_warn(dev, "HW is overloaded, needed: %lu max: %lu\n",
@@ -1093,6 +1116,8 @@ void venus_helper_vb2_buf_queue(struct vb2_buffer *vb)
 	if (ret)
 		goto unlock;
 
+	load_scale_clocks(inst);
+
 	ret = session_process_buf(inst, vbuf);
 	if (ret)
 		return_buf_error(inst, vbuf);
-- 
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