diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.19/950-0802-mmc-sdhci-iproc-Fix-vmmc-regulators-on-iProc.patch')
-rw-r--r-- | target/linux/brcm2708/patches-4.19/950-0802-mmc-sdhci-iproc-Fix-vmmc-regulators-on-iProc.patch | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0802-mmc-sdhci-iproc-Fix-vmmc-regulators-on-iProc.patch b/target/linux/brcm2708/patches-4.19/950-0802-mmc-sdhci-iproc-Fix-vmmc-regulators-on-iProc.patch new file mode 100644 index 0000000000..5046fc91e9 --- /dev/null +++ b/target/linux/brcm2708/patches-4.19/950-0802-mmc-sdhci-iproc-Fix-vmmc-regulators-on-iProc.patch @@ -0,0 +1,46 @@ +From 5ee0de9d7abd644d4cb678fe26ac5130a1a8075f Mon Sep 17 00:00:00 2001 +From: Phil Elwell <phil@raspberrypi.org> +Date: Fri, 2 Aug 2019 15:20:11 +0100 +Subject: [PATCH] mmc: sdhci-iproc: Fix vmmc regulators on iProc + +The Linux support for controlling card power via regulators appears to +be contentious. I would argue that the default behaviour is contrary to +the SDHCI spec - turning off the power writes a reserved value to the +SD Bus Voltage Select field of the Power Control Register, which +seems to kill the Arasan/iProc controller - but fortunately there is a +hook in sdhci_ops to override the behaviour. Borrow the implementation +from sdhci_arasan_set_power. + +Signed-off-by: Phil Elwell <phil@raspberrypi.org> +--- + drivers/mmc/host/sdhci-iproc.c | 12 ++++++++++++ + 1 file changed, 12 insertions(+) + +--- a/drivers/mmc/host/sdhci-iproc.c ++++ b/drivers/mmc/host/sdhci-iproc.c +@@ -162,6 +162,17 @@ static void sdhci_iproc_writeb(struct sd + sdhci_iproc_writel(host, newval, reg & ~3); + } + ++static void sdhci_iproc_set_power(struct sdhci_host *host, unsigned char mode, ++ unsigned short vdd) ++{ ++ if (!IS_ERR(host->mmc->supply.vmmc)) { ++ struct mmc_host *mmc = host->mmc; ++ ++ mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd); ++ } ++ sdhci_set_power_noreg(host, mode, vdd); ++} ++ + static const struct sdhci_ops sdhci_iproc_ops = { + .set_clock = sdhci_set_clock, + .get_max_clock = sdhci_pltfm_clk_get_max_clock, +@@ -178,6 +189,7 @@ static const struct sdhci_ops sdhci_ipro + .write_w = sdhci_iproc_writew, + .write_b = sdhci_iproc_writeb, + .set_clock = sdhci_set_clock, ++ .set_power = sdhci_iproc_set_power, + .get_max_clock = sdhci_pltfm_clk_get_max_clock, + .set_bus_width = sdhci_set_bus_width, + .reset = sdhci_reset, |