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From: Jun Nie <jun.nie@linaro.org>
To: ulf.hansson@linaro.org, robh+dt@kernel.org, mark.rutland@arm.com,
	adrian.hunter@intel.com, linux-mmc@vger.kernel.org,
	devicetree@vger.kernel.org
Subject: [PATCH 2/4] mmc: sdhci: dt: Add DMA boundary and HS400 properties
Date: Mon,  2 Dec 2019 22:41:02 +0800	[thread overview]
Message-ID: <20191202144104.5069-3-jun.nie@linaro.org> (raw)
In-Reply-To: <20191202144104.5069-1-jun.nie@linaro.org>

DMA memory cannot cross specific boundary on some controller, such as 128MB
on SDHCI Designware. Add sdhci-dma-mem-boundary property to split DMA
operation in such case.

sdhci-ctrl-hs400 specify the HS400 mode setting for register
SDHCI_HOST_CONTROL2(offset 0x3E:bit[2:0]). Because this value is not
defined in SDHC Standard specification.

Signed-off-by: Jun Nie <jun.nie@linaro.org>
---
 Documentation/devicetree/bindings/mmc/sdhci.txt | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/mmc/sdhci.txt b/Documentation/devicetree/bindings/mmc/sdhci.txt
index 0e9923a64024..e6d7feb9a741 100644
--- a/Documentation/devicetree/bindings/mmc/sdhci.txt
+++ b/Documentation/devicetree/bindings/mmc/sdhci.txt
@@ -11,3 +11,11 @@ Optional properties:
 - sdhci-caps: The sdhci capabilities register is incorrect. This 64bit
   property corresponds to the bits in the sdhci capability register. If the
   bit is on in the property then the bit should be turned on.
+- sdhci-dma-mem-boundary: The sdhci controller DMA memory space boundary.
+  If the controller's DMA cannot cross a specific memory space boundary,
+  such as 128MB, set this value in dt and driver will split the DMA
+  operation when crossing such boundary.
+- sdhci-ctrl-hs400: The HS400 is not defined in SDHC Standard specification
+  for SDHCI_HOST_CONTROL2(offset 0x3E:bit[2:0]). Different controllers have
+  have different value for HS400 mode. If 0x5 is not the HS400 mode value
+  for your controller, you should specify the value with this property.
-- 
2.17.1


  parent reply	other threads:[~2019-12-02 14:41 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-02 14:41 [PATCH 0/4] mmc: Add sdhci workaround stability enhencement Jun Nie
2019-12-02 14:41 ` [PATCH 1/4] mmc: sdhci: Add delay after power off Jun Nie
2019-12-03  7:26   ` Adrian Hunter
2019-12-02 14:41 ` Jun Nie [this message]
2019-12-13 23:01   ` [PATCH 2/4] mmc: sdhci: dt: Add DMA boundary and HS400 properties Rob Herring
2019-12-17 14:56     ` Jun Nie
2019-12-02 14:41 ` [PATCH 3/4] mmc: sdhci: Set ctrl_hs400 value in dts Jun Nie
2019-12-03  7:52   ` Adrian Hunter
2019-12-02 14:41 ` [PATCH 4/4] mmc: sdhci: Add DMA memory boundary workaround Jun Nie
2019-12-02 17:52   ` Christoph Hellwig
2019-12-03  3:29     ` Jun Nie
2019-12-03  7:36       ` Christoph Hellwig
2019-12-04  6:00         ` Jun Nie
2019-12-04  7:14           ` Jisheng Zhang
2019-12-10  9:36             ` Ulf Hansson
2019-12-03  2:47   ` Jisheng Zhang
2019-12-03  3:33     ` Jun Nie
2019-12-03  9:05       ` Jisheng Zhang
2019-12-03  9:18         ` Christoph Hellwig
2019-12-03  9:49           ` Jisheng Zhang
2019-12-03 13:06             ` Christoph Hellwig
2019-12-04  7:11               ` Jisheng Zhang
2019-12-03  9:49         ` Jisheng Zhang
2019-12-03 13:04           ` Christoph Hellwig

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