[PATCH 20/23] Alternative mmc structure to support pxa168, pxa910, mmp2 family SD
From: Philip Rakity <hidden>
Date: 2010-12-22 07:10:59
Also in:
linux-arm-kernel
From 590eb2cc052330b7a4f68fb2df6255d65e249e1d Mon Sep 17 00:00:00 2001
From: Philip Rakity <redacted> Date: Mon, 20 Dec 2010 21:47:37 -0800 Subject: [PATCH] sdhci: support hardware clock gating in the SD layer Define callback (platform_hw_clk_gate) that is called when H/W clock gating is defined. The adaptation layer is responsible for enabling hw clock gating by: a) setting mmc->caps |= MMC_CAP_HW_CLOCK_GATING to enable h/w gating b) defining the callback. Signed-off-by: Philip Rakity <redacted> Signed-off-by: Mark F. Brown <redacted> Tested-by: Philip Rakity <redacted> --- drivers/mmc/host/sdhci.c | 6 ++++++ drivers/mmc/host/sdhci.h | 1 + 2 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index ff9d5f0..dcfbe83 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c@@ -1203,6 +1203,12 @@ static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) if (host->ops->platform_send_init_74_clocks) host->ops->platform_send_init_74_clocks(host, ios->power_mode); +#ifdef CONFIG_MMC_CLKGATE + if ((mmc->caps & MMC_CAP_HW_CLOCK_GATING) + && host->ops->platform_hw_clk_gate) + host->ops->platform_hw_clk_gate(host); +#endif + /* * If your platform has 8-bit width support but is not a v3 controller, * or if it requires special setup code, you should implement that in
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 84292e0..cbd63e2 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h@@ -241,6 +241,7 @@ struct sdhci_ops { void (*platform_reset_exit)(struct sdhci_host *host, u8 mask); unsigned int (*get_f_max_clock)(struct sdhci_host *host); void (*platform_specific_delay)(struct sdhci_host *host); + void (*platform_hw_clk_gate)(struct sdhci_host *host); }; #ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS
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1.6.0.4Attachments
- 0020-sdhci-support-hardware-clock-gating-in-the-SD-layer.patch [application/octet-stream] 1927 bytes · preview