diff options
| author | Sukrut Bellary <sukrut.bellary@linux.com> | 2024-03-25 09:35:10 -0500 |
|---|---|---|
| committer | Nishanth Menon <nm@ti.com> | 2024-04-09 19:29:15 -0500 |
| commit | a2a6bbd108da8dcbf378bc452ce0cf0e5b143f99 (patch) | |
| tree | 6110f7d1ba229a89b4bbcf48ccfd8e82d2c4ac05 | |
| parent | ef00a95def6f6f5e2bd18ad3cb73834650768288 (diff) | |
| download | linux-a2a6bbd108da8dcbf378bc452ce0cf0e5b143f99.tar.gz | |
arm64: dts: ti: k3-am625-beagleplay: Use mmc-pwrseq for wl18xx enable
BeaglePlay SBC[1] has Texas Instrument's WL18xx WiFi chipset[2].
Currently, WLAN_EN is configured as regulator and regulator-always-on.
However, the timing and wlan_en sequencing is not correctly modelled.
This causes the sdio access to fail during runtime-pm power operations
saving or during system suspend/resume/hibernation/freeze operations.
This is because the WLAN_EN line is not deasserted to low '0' to power
down the WiFi. So during restore, the WiFi driver tries to load the FW
without following correct power sequence. WLAN_EN => '1'/assert (high)
to power-up the chipset.
Use mmc-pwrseq-simple to drive TI's WiFi (WL18xx) chipset enable
'WLAN_EN'. mmc-pwrseq-simple provides power sequence flexibility with
support for post power-on and power-off delays.
Typical log signature that indicates this bug is:
wl1271_sdio mmc2:0001:2: sdio write failed (-110)
Followed by possibly a kernel warning (depending on firmware present):
WARNING: CPU: 1 PID: 45 at drivers/net/wireless/ti/wlcore/sdio.c:123 wl12xx_sdio_raw_write+0xe4/0x168 [wlcore_sdio]
[1] https://www.beagleboard.org/boards/beagleplay
[2] https://www.ti.com/lit/ds/symlink/wl1807mod.pdf
Fixes: f5a731f0787f ("arm64: dts: ti: Add k3-am625-beagleplay")
Suggested-by: Shengyu Qu <wiagn233@outlook.com>
Signed-off-by: Sukrut Bellary <sukrut.bellary@linux.com>
Tested-by: Robert Nelson <robertcnelson@gmail.com>
Link: https://lore.kernel.org/r/20240325143511.2144768-1-nm@ti.com
Signed-off-by: Nishanth Menon <nm@ti.com>
| -rw-r--r-- | arch/arm64/boot/dts/ti/k3-am625-beagleplay.dts | 27 |
1 files changed, 12 insertions, 15 deletions
diff --git a/arch/arm64/boot/dts/ti/k3-am625-beagleplay.dts b/arch/arm64/boot/dts/ti/k3-am625-beagleplay.dts index a34e0df2ab864..84977c1cc85df 100644 --- a/arch/arm64/boot/dts/ti/k3-am625-beagleplay.dts +++ b/arch/arm64/boot/dts/ti/k3-am625-beagleplay.dts @@ -82,6 +82,17 @@ }; }; + sdio_pwrseq: sdio-pwrseq { + compatible = "mmc-pwrseq-simple"; + pinctrl-names = "default"; + pinctrl-0 = <&wifi_en_pins_default>; + /* Internal power on time(Figure 8-3) * 2 */ + post-power-on-delay-ms = <10>; + /* Re-enable time(Figure 8-2) + 20uS */ + power-off-delay-us = <80>; + reset-gpios = <&main_gpio0 38 GPIO_ACTIVE_LOW>; + }; + vsys_5v0: regulator-1 { bootph-all; compatible = "regulator-fixed"; @@ -104,20 +115,6 @@ regulator-boot-on; }; - wlan_en: regulator-3 { - /* OUTPUT of SN74AVC2T244DQMR */ - compatible = "regulator-fixed"; - regulator-name = "wlan_en"; - regulator-min-microvolt = <1800000>; - regulator-max-microvolt = <1800000>; - enable-active-high; - regulator-always-on; - vin-supply = <&vdd_3v3>; - gpio = <&main_gpio0 38 GPIO_ACTIVE_HIGH>; - pinctrl-names = "default"; - pinctrl-0 = <&wifi_en_pins_default>; - }; - vdd_3v3_sd: regulator-4 { /* output of TPS22918DBVR-U21 */ bootph-all; @@ -839,13 +836,13 @@ }; &sdhci2 { - vmmc-supply = <&wlan_en>; pinctrl-names = "default"; pinctrl-0 = <&wifi_pins_default>, <&wifi_32k_clk>; non-removable; ti,fails-without-test-cd; cap-power-off-card; keep-power-in-suspend; + mmc-pwrseq = <&sdio_pwrseq>; assigned-clocks = <&k3_clks 157 158>; assigned-clock-parents = <&k3_clks 157 160>; #address-cells = <1>; |