| Message ID | 20231124070839.12484-3-axe.yang@mediatek.com |
|---|---|
| State | New |
| Headers | show |
| Series | mmc: mediatek: add support for complete clock cycle tuning | expand |
On 24/11/2023 08:08, Axe Yang wrote: > 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. Documentation goes before users. > > 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. This scales poorly. Instead should be enum with number of tuning steps. > + 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. Best regards, Krzysztof
Hi Krzysztof, Thank you for the comments. I uploaded patchset v2 just now, please have a look. Regards, Axe On Fri, 2023-11-24 at 09:24 +0100, Krzysztof Kozlowski wrote: > > External email : Please do not click links or open attachments until > you have verified the sender or the content. > On 24/11/2023 08:08, Axe Yang wrote: > > 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. > > Documentation goes before users. Fixed in v2. > > > > 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. > > This scales poorly. Instead should be enum with number of tuning > steps. Fixed in v2. > > > + 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. > > Best regards, > Krzysztof >
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
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(+)