linux-kernel - [PATCH 3/3] ARM: dts: tacoma: Add data sample phase delay for eMMC

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Message-Id: <20200910105440.3087723-4-andrew@aj.id.au>
Date:   Thu, 10 Sep 2020 20:24:40 +0930
From:   Andrew Jeffery <andrew@...id.au>
To:     linux-mmc@...r.kernel.org
Cc:     adrian.hunter@...el.com, ulf.hansson@...aro.org, joel@....id.au,
        robh+dt@...nel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] ARM: dts: tacoma: Add data sample phase delay for eMMC

Adjust the phase delay to avoid data timeout splats like the following:

[  731.368601] mmc0: Timeout waiting for hardware interrupt.
[  731.374644] mmc0: sdhci: ============ SDHCI REGISTER DUMP ===========
[  731.381828] mmc0: sdhci: Sys addr:  0x00000020 | Version:  0x00000002
[  731.389012] mmc0: sdhci: Blk size:  0x00007200 | Blk cnt:  0x00000020
[  731.396194] mmc0: sdhci: Argument:  0x00462a18 | Trn mode: 0x0000002b
[  731.403377] mmc0: sdhci: Present:   0x01f70106 | Host ctl: 0x00000017
[  731.410559] mmc0: sdhci: Power:     0x0000000f | Blk gap:  0x00000000
[  731.417733] mmc0: sdhci: Wake-up:   0x00000000 | Clock:    0x00000107
[  731.424915] mmc0: sdhci: Timeout:   0x0000000e | Int stat: 0x00000000
[  731.432098] mmc0: sdhci: Int enab:  0x03ff008b | Sig enab: 0x03ff008b
[  731.439282] mmc0: sdhci: ACmd stat: 0x00000000 | Slot int: 0x00000000
[  731.446464] mmc0: sdhci: Caps:      0x01f80080 | Caps_1:   0x00000007
[  731.453647] mmc0: sdhci: Cmd:       0x0000193a | Max curr: 0x001f0f08
[  731.460829] mmc0: sdhci: Resp[0]:   0x00000900 | Resp[1]:  0xffffffff
[  731.468013] mmc0: sdhci: Resp[2]:   0x320f5913 | Resp[3]:  0x00000900
[  731.475195] mmc0: sdhci: Host ctl2: 0x0000008b
[  731.480139] mmc0: sdhci: ADMA Err:  0x00000000 | ADMA Ptr: 0xbe040200
[  731.487321] mmc0: sdhci: ============================================

Signed-off-by: Andrew Jeffery <andrew@...id.au>
---
 arch/arm/boot/dts/aspeed-bmc-opp-tacoma.dts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/boot/dts/aspeed-bmc-opp-tacoma.dts b/arch/arm/boot/dts/aspeed-bmc-opp-tacoma.dts
index 5f4ee67ac787..94ec301ceb73 100644
--- a/arch/arm/boot/dts/aspeed-bmc-opp-tacoma.dts
+++ b/arch/arm/boot/dts/aspeed-bmc-opp-tacoma.dts
@@ -179,6 +179,8 @@ &emmc_controller {
 
 &emmc {
 	status = "okay";
+	aspeed,input-phase = <0x7>;
+	aspeed,output-phase = <0x1f>;
 };
 
 &fsim0 {
-- 
2.25.1