diff mbox series

[v2,09/14] doc: dt: fsl-imx-esdhc: add auto-cmd23-broken binding

Message ID 20191204022537.15500-1-haibo.chen@nxp.com (mailing list archive)
State New, archived
Headers show
Series None | expand

Commit Message

Bough Chen Dec. 4, 2019, 2:18 a.m. UTC 
Add sdhci,auto-cmd23-broken binding.

Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
---
 Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.txt | 8 ++++++++
 1 file changed, 8 insertions(+)
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.txt b/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.txt
index 89b986a2f9d5..7ea8e0f14e5f 100644
--- a/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.txt
+++ b/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.txt
@@ -46,6 +46,14 @@  Optional properties:
   property allows user to change the delay target for the strobe input read clock.
   If not use this property, driver default set the delay target to value 7.
   Only eMMC HS400 mode need to take care of this property.
+- sdhci,auto-cmd23-broken: disable the ACMD23 function of USDHC.
+  This is required for eMMC on imx6qpdl/imx6sx/imx7d when it use ADMA mode. Because
+  for these SoC, it do not support the ACMD23 completely, only take the 16 bit block
+  count from the 0x4 register (BLK_ATT) as argument for the ACMD23, the upper 16 bit
+  of the CMD23's argument is ignored. This will impact the reliable write operation
+  and the RPMB block write operation, because these operations need to set the bit 31
+  of the CMD23's argument. SDMA mode will default disable the ACMD23 mode. SD card do
+  not has this limitation on these SoCs.
 
 Examples: