60 lines
2.3 KiB
Diff
60 lines
2.3 KiB
Diff
From d7044f06dea839c61a01e6016a4b9dee15543f8d Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Thu, 30 Jan 2020 09:47:00 +0000
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Subject: [PATCH] ARM: dts: Add sd_poll_once dtparam to bcm283x/2711
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The old sdtweak overlay allowed the SD interface to be effectively
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disabled unless there was a card present at boot time, but that
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overlay doesn't work on bcm2711 and has largely been replaced by
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a set of sd_* dtparams (which have the advantage of being board-
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specific.
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Add an sd_poll_once dtparam to allow the same functionality on
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all Raspberry Pi boards.
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See: https://github.com/raspberrypi/linux/issues/3286
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Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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---
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arch/arm/boot/dts/bcm2708-rpi.dtsi | 1 +
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arch/arm/boot/dts/bcm2711-rpi-4-b.dts | 2 ++
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arch/arm/boot/dts/overlays/README | 7 +++++++
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3 files changed, 10 insertions(+)
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--- a/arch/arm/boot/dts/bcm2708-rpi.dtsi
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+++ b/arch/arm/boot/dts/bcm2708-rpi.dtsi
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@@ -92,6 +92,7 @@
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watchdog = <&watchdog>,"status";
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random = <&random>,"status";
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sd_overclock = <&sdhost>,"brcm,overclock-50:0";
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+ sd_poll_once = <&sdhost>,"non-removable?";
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sd_force_pio = <&sdhost>,"brcm,force-pio?";
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sd_pio_limit = <&sdhost>,"brcm,pio-limit:0";
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sd_debug = <&sdhost>,"brcm,debug";
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--- a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
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+++ b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
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@@ -349,5 +349,7 @@
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eth_led0 = <&phy1>,"led-modes:0";
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eth_led1 = <&phy1>,"led-modes:4";
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+
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+ sd_poll_once = <&emmc2>, "non-removable?";
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};
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};
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -165,6 +165,13 @@ Params:
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sd_overclock Clock (in MHz) to use when the MMC framework
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requests 50MHz
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+ sd_poll_once Looks for a card once after booting. Useful
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+ for network booting scenarios to avoid the
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+ overhead of continuous polling. N.B. Using
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+ this option restricts the system to using a
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+ single card per boot (or none at all).
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+ (default off)
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+
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sd_force_pio Disable DMA support for SD driver (default off)
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sd_pio_limit Number of blocks above which to use DMA for
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