target/linux/bcm27xx/patches-4.19/950-0811-ARM-dts-Add-sd_poll_once-dtparam-to-bcm283x-2711.patch

   1 From d7044f06dea839c61a01e6016a4b9dee15543f8d Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.org>
   3 Date: Thu, 30 Jan 2020 09:47:00 +0000
   4 Subject: [PATCH] ARM: dts: Add sd_poll_once dtparam to bcm283x/2711
   5
   6 The old sdtweak overlay allowed the SD interface to be effectively
   7 disabled unless there was a card present at boot time, but that
   8 overlay doesn't work on bcm2711 and has largely been replaced by
   9 a set of sd_* dtparams (which have the advantage of being board-
  10 specific.
  11
  12 Add an sd_poll_once dtparam to allow the same functionality on
  13 all Raspberry Pi boards.
  14
  15 See: https://github.com/raspberrypi/linux/issues/3286
  16
  17 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
  18 ---
  19  arch/arm/boot/dts/bcm2708-rpi.dtsi    | 1 +
  20  arch/arm/boot/dts/bcm2711-rpi-4-b.dts | 2 ++
  21  arch/arm/boot/dts/overlays/README     | 7 +++++++
  22  3 files changed, 10 insertions(+)
  23
  24 --- a/arch/arm/boot/dts/bcm2708-rpi.dtsi
  25 +++ b/arch/arm/boot/dts/bcm2708-rpi.dtsi
  26 @@ -92,6 +92,7 @@
  27                 watchdog = <&watchdog>,"status";
  28                 random = <&random>,"status";
  29                 sd_overclock = <&sdhost>,"brcm,overclock-50:0";
  30 +               sd_poll_once = <&sdhost>,"non-removable?";
  31                 sd_force_pio = <&sdhost>,"brcm,force-pio?";
  32                 sd_pio_limit = <&sdhost>,"brcm,pio-limit:0";
  33                 sd_debug     = <&sdhost>,"brcm,debug";
  34 --- a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
  35 +++ b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
  36 @@ -349,5 +349,7 @@
  37
  38                 eth_led0 = <&phy1>,"led-modes:0";
  39                 eth_led1 = <&phy1>,"led-modes:4";
  40 +
  41 +               sd_poll_once = <&emmc2>, "non-removable?";
  42         };
  43  };
  44 --- a/arch/arm/boot/dts/overlays/README
  45 +++ b/arch/arm/boot/dts/overlays/README
  46 @@ -165,6 +165,13 @@ Params:
  47          sd_overclock            Clock (in MHz) to use when the MMC framework
  48                                  requests 50MHz
  49
  50 +        sd_poll_once            Looks for a card once after booting. Useful
  51 +                                for network booting scenarios to avoid the
  52 +                                overhead of continuous polling. N.B. Using
  53 +                                this option restricts the system to using a
  54 +                                single card per boot (or none at all).
  55 +                                (default off)
  56 +
  57          sd_force_pio            Disable DMA support for SD driver (default off)
  58
  59          sd_pio_limit            Number of blocks above which to use DMA for