linux-kernel - [PATCH V5 0/2] Re-initialize DLL when MCLK is gated dynamically

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Message-Id: <1542005537-19154-1-git-send-email-vbadigan@codeaurora.org>
Date:   Mon, 12 Nov 2018 12:22:15 +0530
From:   Veerabhadrarao Badiganti <vbadigan@...eaurora.org>
To:     adrian.hunter@...el.com, ulf.hansson@...aro.org,
        robh+dt@...nel.org, evgreen@...omium.org, dianders@...gle.com
Cc:     asutoshd@...eaurora.org, riteshh@...eaurora.org,
        stummala@...eaurora.org, sayalil@...eaurora.org,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        Veerabhadrarao Badiganti <vbadigan@...eaurora.org>
Subject: [PATCH V5 0/2] Re-initialize DLL when MCLK is gated dynamically

On few SDHCI-MSM controllers, the host controller's clock tuning
circuit may go out of sync if controller clocks are gated which
eventually, result in data CRC and command CRC/timeout errors.
To fix this issue, the DLL needs to be re-initialized and restored with
its old settings once clocks are ungated. SDHC cotroller on SDM845 SOC
has this limitation.

Changes since V4:
	- Exactly same as V3, posted multiple mails for V4.
	So to avoid confusion updating it as V5.

Changes since V3:
	- Introduced SoC specific dt compatible string for sdhci-msm
	controller
	- Moved the condition which checks whether tuning is needed or
	not, to a common function.

Changes since V2:
	- Removed an unused variable.
	- Renamed the newly introduced flags to be more meaningful.
	- Added new dt compatible string for SDM845 SOC.

Changes since V1:
	- Replaced dt flag with a dt compatible string to
	indicate SHDCI-MSM controller varients which need this fix.
	- Moved the DLL settings restoration logic from request 
	context to platform driver runtime pm context.

Tested on: sdm845
Veerabhadrarao Badiganti (2):
  dt-bindings: mmc: sdhci-msm: Add SoC-specific compatible strings
  mmc: sdhci-msm: Re-initialize DLL if MCLK is gated dynamically

 .../devicetree/bindings/mmc/sdhci-msm.txt          | 21 ++++--
 drivers/mmc/host/sdhci-msm.c                       | 78 +++++++++++++++++++---
 2 files changed, 84 insertions(+), 15 deletions(-)

-- 
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Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project.