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From: Axe Yang <axe.yang@mediatek.com>
To: Chaotian Jing <chaotian.jing@mediatek.com>,
	Ulf Hansson <ulf.hansson@linaro.org>,
	Rob Herring <robh+dt@kernel.org>,
	"Krzysztof Kozlowski" <krzysztof.kozlowski+dt@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	AngeloGioacchino Del Regno 
	<angelogioacchino.delregno@collabora.com>,
	"Wenbin Mei" <wenbin.mei@mediatek.com>
Cc: <linux-mmc@vger.kernel.org>, <devicetree@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-mediatek@lists.infradead.org>,
	<Project_Global_Chrome_Upstream_Group@mediatek.com>,
	Axe Yang <axe.yang@mediatek.com>
Subject: [PATCH v1 2/2] dt-bindings: mmc: mtk-sd: add 64-steps tuning related property
Date: Fri, 24 Nov 2023 15:08:39 +0800	[thread overview]
Message-ID: <20231124070839.12484-3-axe.yang@mediatek.com> (raw)
In-Reply-To: <20231124070839.12484-1-axe.yang@mediatek.com>

Add 'mediatek,tune-64-steps' option. This property will give MSDC
a chance to achieve a more optimal calibration result, thus avoiding
potential CRC issues.

Signed-off-by: Axe Yang <axe.yang@mediatek.com>
---
 Documentation/devicetree/bindings/mmc/mtk-sd.yaml | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/mmc/mtk-sd.yaml b/Documentation/devicetree/bindings/mmc/mtk-sd.yaml
index 3fffa467e4e1..c33301e2ea33 100644
--- a/Documentation/devicetree/bindings/mmc/mtk-sd.yaml
+++ b/Documentation/devicetree/bindings/mmc/mtk-sd.yaml
@@ -145,6 +145,14 @@ properties:
     minimum: 0
     maximum: 7
 
+  mediatek,tune-64-steps:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      Some Soc need enable 64-steps tuning for better delay value to avoid CRC issue.
+      If present, tune 64 steps to cover a complete clock cycle.
+      If not present, tune only 32 steps. For eMMC and SD, this can also yield
+      satisfactory calibration results in most cases.
+
   resets:
     maxItems: 1
 
-- 
2.25.1


WARNING: multiple messages have this Message-ID (diff)
From: Axe Yang <axe.yang@mediatek.com>
To: Chaotian Jing <chaotian.jing@mediatek.com>,
	Ulf Hansson <ulf.hansson@linaro.org>,
	Rob Herring <robh+dt@kernel.org>,
	"Krzysztof Kozlowski" <krzysztof.kozlowski+dt@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	AngeloGioacchino Del Regno
	<angelogioacchino.delregno@collabora.com>,
	"Wenbin Mei" <wenbin.mei@mediatek.com>
Cc: <linux-mmc@vger.kernel.org>, <devicetree@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-mediatek@lists.infradead.org>,
	<Project_Global_Chrome_Upstream_Group@mediatek.com>,
	Axe Yang <axe.yang@mediatek.com>
Subject: [PATCH v1 2/2] dt-bindings: mmc: mtk-sd: add 64-steps tuning related property
Date: Fri, 24 Nov 2023 15:08:39 +0800	[thread overview]
Message-ID: <20231124070839.12484-3-axe.yang@mediatek.com> (raw)
In-Reply-To: <20231124070839.12484-1-axe.yang@mediatek.com>

Add 'mediatek,tune-64-steps' option. This property will give MSDC
a chance to achieve a more optimal calibration result, thus avoiding
potential CRC issues.

Signed-off-by: Axe Yang <axe.yang@mediatek.com>
---
 Documentation/devicetree/bindings/mmc/mtk-sd.yaml | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/mmc/mtk-sd.yaml b/Documentation/devicetree/bindings/mmc/mtk-sd.yaml
index 3fffa467e4e1..c33301e2ea33 100644
--- a/Documentation/devicetree/bindings/mmc/mtk-sd.yaml
+++ b/Documentation/devicetree/bindings/mmc/mtk-sd.yaml
@@ -145,6 +145,14 @@ properties:
     minimum: 0
     maximum: 7
 
+  mediatek,tune-64-steps:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      Some Soc need enable 64-steps tuning for better delay value to avoid CRC issue.
+      If present, tune 64 steps to cover a complete clock cycle.
+      If not present, tune only 32 steps. For eMMC and SD, this can also yield
+      satisfactory calibration results in most cases.
+
   resets:
     maxItems: 1
 
-- 
2.25.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2023-11-24  7:09 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-11-24  7:08 [PATCH v1 0/2] mmc: mediatek: add support for complete clock cycle tuning Axe Yang
2023-11-24  7:08 ` Axe Yang
2023-11-24  7:08 ` [PATCH v1 1/2] mmc: mediatek: add support for 64-steps tuning Axe Yang
2023-11-24  7:08   ` Axe Yang
2023-11-29  1:39   ` Chaotian Jing (井朝天)
2023-11-29  1:39     ` Chaotian Jing (井朝天)
2023-11-24  7:08 ` Axe Yang [this message]
2023-11-24  7:08   ` [PATCH v1 2/2] dt-bindings: mmc: mtk-sd: add 64-steps tuning related property Axe Yang
2023-11-24  8:24   ` Krzysztof Kozlowski
2023-11-24  8:24     ` Krzysztof Kozlowski
2023-11-28  7:07     ` Axe Yang (杨磊)
2023-11-28  7:07       ` Axe Yang (杨磊)

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