On Variscite Varsom we have three devices connected to MMC * MMC1: eMMC * MMC2: SDCard * MMC3: Wifi
Without this patch only the first device was detected properly. I found two workarounds which can be removed by this patch: 1. Variscite: booting from SDCard made possible by renumbering MMC devices [1]. 2. BoundaryDevices: Add workqueues for each mmc_host [2]. This had been tested here too but causes crashing sdcard for huge storage traffic. [1] https://github.com/varigit/linux-2.6-imx/blob/imx_3.10.53_1.1.0_ga_var01/arch/arm/boot/dts/imx6qdl.dtsi / Line 879 [2] https://github.com/boundarydevices/linux-imx6/commit/1d40159a995a298f16901bfb14ae3e0294c65691 Signed-off-by: Andreas Müller <schnitzelt...@googlemail.com> --- ...sdhc-imx-Fixup-runtime-PM-conditions-duri.patch | 36 ++++++++++++++++++++++ recipes-kernel/linux/linux-imx_3.14.28.bb | 1 + 2 files changed, 37 insertions(+) create mode 100644 recipes-kernel/linux/linux-imx-3.14.28/0004-mmc-sdhci-esdhc-imx-Fixup-runtime-PM-conditions-duri.patch diff --git a/recipes-kernel/linux/linux-imx-3.14.28/0004-mmc-sdhci-esdhc-imx-Fixup-runtime-PM-conditions-duri.patch b/recipes-kernel/linux/linux-imx-3.14.28/0004-mmc-sdhci-esdhc-imx-Fixup-runtime-PM-conditions-duri.patch new file mode 100644 index 0000000..0d3caa4 --- /dev/null +++ b/recipes-kernel/linux/linux-imx-3.14.28/0004-mmc-sdhci-esdhc-imx-Fixup-runtime-PM-conditions-duri.patch @@ -0,0 +1,36 @@ +From 77903c01d8c6c5d2544085ba074aceadc1191d21 Mon Sep 17 00:00:00 2001 +From: Ulf Hansson <ulf.hans...@linaro.org> +Date: Thu, 11 Dec 2014 15:12:25 +0100 +Subject: [PATCH 2/2] mmc: sdhci-esdhc-imx: Fixup runtime PM conditions during + ->probe() + +By configure runtime PM prior we enable the use of it, we close the gap +for strange and unhandled conditions. Moreover it makes us rely on the +driver core, after finalized ->probe(), to request an inactive device +to become runtime PM idle/suspended, which earlier potentially could +happen already at pm_runtime_set_autosuspend_delay(). + +Signed-off-by: Ulf Hansson <ulf.hans...@linaro.org> +--- + drivers/mmc/host/sdhci-esdhc-imx.c | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c +index 043866c..10ef824 100644 +--- a/drivers/mmc/host/sdhci-esdhc-imx.c ++++ b/drivers/mmc/host/sdhci-esdhc-imx.c +@@ -1080,10 +1080,10 @@ static int sdhci_esdhc_imx_probe(struct platform_device *pdev) + goto disable_clk; + + pm_runtime_set_active(&pdev->dev); +- pm_runtime_enable(&pdev->dev); + pm_runtime_set_autosuspend_delay(&pdev->dev, 50); + pm_runtime_use_autosuspend(&pdev->dev); + pm_suspend_ignore_children(&pdev->dev, 1); ++ pm_runtime_enable(&pdev->dev); + + return 0; + +-- +1.9.3 + diff --git a/recipes-kernel/linux/linux-imx_3.14.28.bb b/recipes-kernel/linux/linux-imx_3.14.28.bb index e3078f7..5d1be54 100644 --- a/recipes-kernel/linux/linux-imx_3.14.28.bb +++ b/recipes-kernel/linux/linux-imx_3.14.28.bb @@ -18,6 +18,7 @@ SRC_URI += " \ file://0001-ARM-imx6q-drop-unnecessary-semicolon.patch \ file://0002-ARM-clk-imx6q-fix-video-divider-for-rev-T0-1.0.patch \ file://0003-ARM-imx6sl-Disable-imx6sl-specific-code-when-imx6sl-.patch \ + file://0004-mmc-sdhci-esdhc-imx-Fixup-runtime-PM-conditions-duri.patch \ " COMPATIBLE_MACHINE = "(mx6)" -- 1.9.3 -- _______________________________________________ meta-freescale mailing list meta-freescale@yoctoproject.org https://lists.yoctoproject.org/listinfo/meta-freescale
