linux-kernel - [PATCH 3/5] media: venus: Update clock scaling

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Message-Id: <1560233130-27264-4-git-send-email-amasule@codeaurora.org>
Date:   Tue, 11 Jun 2019 11:35:28 +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 3/5] media: venus: Update clock scaling

Current clock scaling calculations are same for vpu4 and
previous versions. For vpu4, Clock scaling calculations
are updated with cycles/mb. This helps in getting precise
clock required.

Signed-off-by: Aniket Masule <amasule@...eaurora.org>
---
 drivers/media/platform/qcom/venus/helpers.c | 88 +++++++++++++++++++++++++++--
 1 file changed, 84 insertions(+), 4 deletions(-)

diff --git a/drivers/media/platform/qcom/venus/helpers.c b/drivers/media/platform/qcom/venus/helpers.c
index f7f724b..7bcc1e6 100644
--- a/drivers/media/platform/qcom/venus/helpers.c
+++ b/drivers/media/platform/qcom/venus/helpers.c
@@ -348,8 +348,9 @@ static u32 load_per_type(struct venus_core *core, u32 session_type)
 	return mbs_per_sec;
 }
 
-static int load_scale_clocks(struct venus_core *core)
+static int scale_clocks(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;
 	unsigned long freq = table[0].freq;
@@ -398,6 +399,86 @@ static int load_scale_clocks(struct venus_core *core)
 	return ret;
 }
 
+static unsigned long calculate_inst_freq(struct venus_inst *inst)
+{
+	unsigned long vpp_cycles = 0;
+	u32 mbs_per_sec;
+
+	mbs_per_sec = load_per_instance(inst);
+	vpp_cycles = mbs_per_sec * inst->clk_data.codec_data->vpp_cycles;
+	/* 21 / 20 is overhead factor */
+	vpp_cycles += vpp_cycles / 20;
+
+	return vpp_cycles;
+}
+
+static int scale_clocks_vpu4(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 clk *clk = core->clks[0];
+	struct device *dev = core->dev;
+	unsigned int i;
+	unsigned long freq = 0, freq_core0 = 0, freq_core1 = 0;
+	int ret;
+
+	freq = calculate_inst_freq(inst);
+
+	if (freq > table[0].freq)
+		goto err;
+
+	for (i = 0; i < num_rows; i++) {
+		if (freq > table[i].freq)
+			break;
+		freq = table[i].freq;
+	}
+
+	inst->clk_data.freq = freq;
+
+	mutex_lock(&core->lock);
+	list_for_each_entry(inst, &core->instances, list) {
+		if (inst->clk_data.core_id == VIDC_CORE_ID_1) {
+			freq_core0 += inst->clk_data.freq;
+		} else if (inst->clk_data.core_id == VIDC_CORE_ID_2) {
+			freq_core1 += inst->clk_data.freq;
+		} else if (inst->clk_data.core_id == VIDC_CORE_ID_3) {
+			freq_core0 += inst->clk_data.freq;
+			freq_core1 += inst->clk_data.freq;
+		}
+	}
+	mutex_unlock(&core->lock);
+
+	freq = max(freq_core0, freq_core1);
+
+	ret = clk_set_rate(clk, freq);
+	if (ret)
+		goto err;
+
+	ret = clk_set_rate(core->core0_clk, freq);
+	if (ret)
+		goto err;
+
+	ret = clk_set_rate(core->core1_clk, freq);
+	if (ret)
+		goto err;
+
+	return 0;
+
+err:
+	dev_err(dev, "failed to set clock rate %lu (%d)\n", freq, ret);
+	return ret;
+}
+
+static int load_scale_clocks(struct venus_inst *inst)
+{
+	if (IS_V3(inst->core) || IS_V1(inst->core))
+		return scale_clocks(inst);
+	else
+		return scale_clocks_vpu4(inst);
+}
+
 static void fill_buffer_desc(const struct venus_buffer *buf,
 			     struct hfi_buffer_desc *bd, bool response)
 {
@@ -1053,7 +1134,7 @@ void venus_helper_vb2_stop_streaming(struct vb2_queue *q)
 
 		venus_helper_free_dpb_bufs(inst);
 
-		load_scale_clocks(core);
+		load_scale_clocks(inst);
 		INIT_LIST_HEAD(&inst->registeredbufs);
 	}
 
@@ -1070,7 +1151,6 @@ void venus_helper_vb2_stop_streaming(struct vb2_queue *q)
 
 int venus_helper_vb2_start_streaming(struct venus_inst *inst)
 {
-	struct venus_core *core = inst->core;
 	int ret;
 
 	ret = intbufs_alloc(inst);
@@ -1081,7 +1161,7 @@ int venus_helper_vb2_start_streaming(struct venus_inst *inst)
 	if (ret)
 		goto err_bufs_free;
 
-	load_scale_clocks(core);
+	load_scale_clocks(inst);
 
 	ret = hfi_session_load_res(inst);
 	if (ret)
-- 
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