From bcfb23ec7ef007f637a699031c8a3417dbb3b7e5 Mon Sep 17 00:00:00 2001 From: Daniel Golle Date: Wed, 12 Apr 2023 21:36:43 +0100 Subject: [PATCH] pinctrl: mediatek: set R1/R0 in case pullen/pullsel succeeded Commit dafe0fbfb0f3 ("pinctrl: mediatek: rewrite mtk_pinconf_set and related functions") changed the logic deciding to set R0 and R1 registers for V1 devices. Before: /* Also set PUPD/R0/R1 if the pin has them */ err = mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_PUPD, !pullup); if (err != -EINVAL) { mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_R0, r0); mtk_hw_set_value(dev, pin, PINCTRL_PIN_REG_R1, r1); } After: /* try pupd_r1_r0 if pullen_pullsel return error */ err = mtk_pinconf_bias_set_pullen_pullsel(dev, pin, disable, pullup, val); if (err) return mtk_pinconf_bias_set_pupd_r1_r0(dev, pin, disable, pullup, val); Tracing mtk_pinconf_bias_set_pullen_pullsel shows that the function always either returns 0 in case of success or -EINVAL in case any error has occurred. Hence the logic responsible of the decision to program R0 and R1 has been inverted. This leads to problems on BananaPi R2 (MT7623N) when booting from SDMMC, it turns out accessing eMMC no longer works since U-Boot 2022.07: MT7623> mmc dev 0 Card did not respond to voltage select! : -110 The problem wasn't detected for a long time as both eMMC and SDMMC work fine if they are used to boot from, and hence R0 and R1 were already setup by the bootrom and/or preloader. Fix the logic to restore the originally intended and correct behavior and also change the descriptive comment accordingly. Fixes: dafe0fbfb0f3 ("pinctrl: mediatek: rewrite mtk_pinconf_set and related functions") Signed-off-by: Daniel Golle Tested-By: Frank Wunderlich --- drivers/pinctrl/mediatek/pinctrl-mtk-common.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c index 47e2d67426..5a4d58b327 100644 --- a/drivers/pinctrl/mediatek/pinctrl-mtk-common.c +++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common.c @@ -349,10 +349,10 @@ int mtk_pinconf_bias_set_v1(struct udevice *dev, u32 pin, bool disable, { int err; - /* try pupd_r1_r0 if pullen_pullsel return error */ + /* set pupd_r1_r0 if pullen_pullsel succeeded */ err = mtk_pinconf_bias_set_pullen_pullsel(dev, pin, disable, pullup, val); - if (err) + if (!err) return mtk_pinconf_bias_set_pupd_r1_r0(dev, pin, disable, pullup, val); -- 2.39.5