From: Ram Prakash Gupta <rampraka@codeaurora.org>
To: asutoshd@codeaurora.org, stummala@codeaurora.org,
sayalil@codeaurora.org, rampraka@codeaurora.org,
vbadigan@codeaurora.org, cang@codeaurora.org,
ppvk@codeaurora.org, adrian.hunter@intel.com,
ulf.hansson@linaro.org, robh+dt@kernel.org,
linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org,
devicetree@vger.kernel.org
Subject: [RFC 0/6] mmc: Add clock scaling support for mmc driver
Date: Mon, 21 Oct 2019 19:59:31 +0530 [thread overview]
Message-ID: <1571668177-3766-1-git-send-email-rampraka@codeaurora.org> (raw)
This change adds the use of devfreq based clock scaling to MMC.
This applicable for eMMC and SDCard.
For some workloads, such as video playback, it isn't necessary
for these cards to run at high speed. Running at lower
frequency, in such cases can still meet the deadlines for data
transfers.
Scaling down the clock frequency dynamically has power savings
not only because the bus is running at lower frequency but also
has an advantage of scaling down the system core voltage, if
supported. Provide an ondemand clock scaling support similar
to the cpufreq ondemand governor having two thresholds,
up_threshold and down_threshold to decide whether to increase
the frequency or scale it down respectively as per load.
Ram Prakash Gupta (6):
mmc: core: Parse clk scaling dt entries
mmc: core: Add core scaling support in driver
mmc: core: Initialize clk scaling for mmc and SDCard
mmc: core: Add debugfs entries for scaling support
mmc: sdhci-msm: Add capability in platfrom host
dt-bindings: mmc: sdhci-msm: Add clk scaling dt parameters
.../devicetree/bindings/mmc/sdhci-msm.txt | 19 +
drivers/mmc/core/block.c | 19 +-
drivers/mmc/core/core.c | 777 +++++++++++++++++++++
drivers/mmc/core/core.h | 17 +
drivers/mmc/core/debugfs.c | 90 +++
drivers/mmc/core/host.c | 226 ++++++
drivers/mmc/core/mmc.c | 246 ++++++-
drivers/mmc/core/queue.c | 2 +
drivers/mmc/core/sd.c | 84 ++-
drivers/mmc/host/sdhci-msm.c | 2 +
include/linux/mmc/card.h | 7 +
include/linux/mmc/host.h | 66 ++
12 files changed, 1550 insertions(+), 5 deletions(-)
--
1.9.1
next reply other threads:[~2019-10-21 14:36 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-21 14:29 Ram Prakash Gupta [this message]
2019-10-21 14:29 ` [RFC 1/6] mmc: core: Parse clk scaling dt entries Ram Prakash Gupta
2019-10-21 14:29 ` [RFC 2/6] mmc: core: Add core scaling support in driver Ram Prakash Gupta
2019-10-21 14:29 ` [RFC 3/6] mmc: core: Initialize clk scaling for mmc and SDCard Ram Prakash Gupta
2019-10-21 14:29 ` [RFC 4/6] mmc: core: Add debugfs entries for scaling support Ram Prakash Gupta
2019-10-21 14:29 ` [RFC 5/6] mmc: sdhci-msm: Add capability in platform host Ram Prakash Gupta
2019-10-21 14:29 ` [RFC 6/6] dt-bindings: mmc: sdhci-msm: Add clk scaling dt parameters Ram Prakash Gupta
2019-10-29 16:36 ` Rob Herring
2019-10-22 8:40 ` [RFC 0/6] mmc: Add clock scaling support for mmc driver Ulf Hansson
[not found] ` <5c78cc29-deb1-4cea-5b30-6f7538ca4703@codeaurora.org>
2019-11-15 17:39 ` Doug Anderson
2019-11-29 8:10 ` rampraka
2019-12-04 2:09 ` Doug Anderson
2019-11-29 7:34 ` rampraka
[not found] ` <0101016eb6152d19-fa1453b7-ae71-49d7-b13b-8c4009375ee1-000000@us-west-2.amazonses.com>
2019-12-18 15:11 ` Ulf Hansson
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