linux-kernel - [PATCH v15 11/11] drm/mediatek: Use cached audio config when changing resolution

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Message-ID: <20220727045035.32225-12-rex-bc.chen@mediatek.com>
Date:   Wed, 27 Jul 2022 12:50:35 +0800
From:   Bo-Chen Chen <rex-bc.chen@...iatek.com>
To:     <chunkuang.hu@...nel.org>, <p.zabel@...gutronix.de>,
        <daniel@...ll.ch>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <mripard@...nel.org>,
        <tzimmermann@...e.de>, <matthias.bgg@...il.com>, <deller@....de>,
        <airlied@...ux.ie>
CC:     <msp@...libre.com>, <granquet@...libre.com>,
        <jitao.shi@...iatek.com>, <wenst@...omium.org>,
        <angelogioacchino.delregno@...labora.com>, <ck.hu@...iatek.com>,
        <liangxu.xu@...iatek.com>, <dri-devel@...ts.freedesktop.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-fbdev@...r.kernel.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        Bo-Chen Chen <rex-bc.chen@...iatek.com>
Subject: [PATCH v15 11/11] drm/mediatek: Use cached audio config when changing resolution

When the audio is playing, we need to use the original configuration to
set the audio instead of using new configuration. Therefore, use the
cached audio configuration during a resolution switch to avoid loss of
sound.

Signed-off-by: Jitao Shi <jitao.shi@...iatek.com>
Signed-off-by: Bo-Chen Chen <rex-bc.chen@...iatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
---
 drivers/gpu/drm/mediatek/mtk_dp.c | 54 ++++++++++---------------------
 1 file changed, 17 insertions(+), 37 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c b/drivers/gpu/drm/mediatek/mtk_dp.c
index 4fc61e0a1963..0acf246abe9b 100644
--- a/drivers/gpu/drm/mediatek/mtk_dp.c
+++ b/drivers/gpu/drm/mediatek/mtk_dp.c
@@ -94,7 +94,7 @@ struct mtk_dp_info {
 	struct videomode vm;
 	u8 frame_rate;
 	u32 pix_rate_khz;
-	struct mtk_dp_audio_cfg audio_caps;
+	struct mtk_dp_audio_cfg audio_cur_cfg;
 };
 
 struct dp_cal_data {
@@ -1799,9 +1799,7 @@ static bool mtk_dp_edid_parse_audio_capabilities(struct mtk_dp *mtk_dp,
 						 struct mtk_dp_audio_cfg *cfg)
 {
 	struct cea_sad *sads;
-	int sad_count;
-	int i;
-	bool ret = false;
+	int ret;
 
 	if (mtk_dp_is_edp(mtk_dp))
 		return false;
@@ -1812,36 +1810,16 @@ static bool mtk_dp_edid_parse_audio_capabilities(struct mtk_dp *mtk_dp,
 		dev_err(mtk_dp->dev, "EDID not found!\n");
 		return false;
 	}
-	sad_count = drm_edid_to_sad(mtk_dp->edid, &sads);
-	mutex_unlock(&mtk_dp->edid_lock);
 
-	if (sad_count <= 0) {
+	ret = drm_edid_to_sad(mtk_dp->edid, &sads);
+	mutex_unlock(&mtk_dp->edid_lock);
+	if (ret <= 0) {
 		drm_info(mtk_dp->drm_dev, "The SADs is NULL\n");
 		return false;
 	}
-
-	for (i = 0; i < sad_count; i++) {
-		int sample_rate, word_length;
-
-		/* Only PCM supported at the moment */
-		if (sads[i].format != HDMI_AUDIO_CODING_TYPE_PCM)
-			continue;
-
-		sample_rate = drm_cea_sad_get_sample_rate(&sads[i]);
-		word_length =
-			drm_cea_sad_get_uncompressed_word_length(&sads[i]);
-		if (sample_rate <= 0 || word_length <= 0)
-			continue;
-
-		cfg->channels = sads[i].channels;
-		cfg->word_length_bits = word_length;
-		cfg->sample_rate = sample_rate;
-		ret = true;
-		break;
-	}
 	kfree(sads);
 
-	return ret;
+	return true;
 }
 
 static void mtk_dp_train_change_mode(struct mtk_dp *mtk_dp)
@@ -2024,13 +2002,13 @@ static int mtk_dp_training(struct mtk_dp *mtk_dp)
 
 	mtk_dp->audio_enable =
 		mtk_dp_edid_parse_audio_capabilities(mtk_dp,
-						     &mtk_dp->info.audio_caps);
+						     &mtk_dp->info.audio_cur_cfg);
 	if (mtk_dp->audio_enable) {
-		mtk_dp_audio_setup(mtk_dp, &mtk_dp->info.audio_caps);
+		mtk_dp_audio_setup(mtk_dp, &mtk_dp->info.audio_cur_cfg);
 		mtk_dp_audio_mute(mtk_dp, false);
 	} else {
-		memset(&mtk_dp->info.audio_caps, 0,
-		       sizeof(mtk_dp->info.audio_caps));
+		memset(&mtk_dp->info.audio_cur_cfg, 0,
+		       sizeof(mtk_dp->info.audio_cur_cfg));
 	}
 
 	return 0;
@@ -2404,6 +2382,9 @@ static void mtk_dp_bridge_atomic_disable(struct drm_bridge *bridge,
 	if (mtk_dp_plug_state(mtk_dp)) {
 		drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D3);
 		usleep_range(2000, 3000);
+	} else {
+		memset(&mtk_dp->info.audio_cur_cfg, 0,
+		       sizeof(mtk_dp->info.audio_cur_cfg));
 	}
 
 	mtk_dp_video_mute(mtk_dp, true);
@@ -2603,18 +2584,17 @@ static int mtk_dp_audio_hw_params(struct device *dev, void *data,
 				  struct hdmi_codec_params *params)
 {
 	struct mtk_dp *mtk_dp = dev_get_drvdata(dev);
-	struct mtk_dp_audio_cfg cfg;
 
 	if (!mtk_dp->enabled) {
 		dev_err(mtk_dp->dev, "%s, DP is not ready!\n", __func__);
 		return -ENODEV;
 	}
 
-	cfg.channels = params->cea.channels;
-	cfg.sample_rate = params->sample_rate;
-	cfg.word_length_bits = 24;
+	mtk_dp->info.audio_cur_cfg.channels = params->cea.channels;
+	mtk_dp->info.audio_cur_cfg.sample_rate = params->sample_rate;
+	mtk_dp->info.audio_cur_cfg.word_length_bits = 24;
 
-	mtk_dp_audio_setup(mtk_dp, &cfg);
+	mtk_dp_audio_setup(mtk_dp, &mtk_dp->info.audio_cur_cfg);
 
 	return 0;
 }
-- 
2.18.0