[{"id":3669660,"web_url":"http://patchwork.ozlabs.org/comment/3669660/","msgid":"","list_archive_url":null,"date":"2026-03-26T11:30:33","subject":"Re: [PATCH v2] pinctrl: renesas: rzg2l: Fix save/restore of\n {IOLH,IEN,PUPD,SMT} registers","submitter":{"id":703,"url":"http://patchwork.ozlabs.org/api/people/703/","name":"Geert Uytterhoeven","email":"geert@linux-m68k.org"},"content":"Hi Biju,\n\nOn Wed, 25 Mar 2026 at 19:28, Biju wrote:\n> From: Biju Das \n>\n> The rzg2l_pinctrl_pm_setup_regs() handles save/restore of\n> {IOLH,IEN,PUPD,SMT} registers during s2ram, but only for ports where all\n> pins share the same pincfg. Extend the code to also support ports with\n> variable pincfg per pin, so that {IOLH,IEN,PUPD,SMT} registers are\n> correctly saved and restored for all pins.\n>\n> Fixes: 254203f9a94c (\"pinctrl: renesas: rzg2l: Add suspend/resume support\")\n> Signed-off-by: Biju Das \n\nThanks for the update!\n\n> ---\n> v1->v2:\n> * Updated commit description\n> * Improved the logic.\n\nYou also fixed the double application of the pin_off index, right?\n\n> --- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c\n> +++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c\n> @@ -3001,9 +3001,12 @@ static void rzg2l_pinctrl_pm_setup_regs(struct rzg2l_pinctrl *pctrl, bool suspen\n> {\n> u32 nports = pctrl->data->n_port_pins / RZG2L_PINS_PER_PORT;\n> struct rzg2l_pinctrl_reg_cache *cache = pctrl->cache;\n> + u32 pin_off = 0;\n>\n> - for (u32 port = 0; port < nports; port++) {\n> + for (u32 port = 0; port < nports; port++, pin_off += RZG2L_PINS_PER_PORT) {\n> + const struct pinctrl_pin_desc *pin_desc = &pctrl->desc.pins[pin_off];\n\nHere you index pctrl->desc.pins[]...\n\n> bool has_iolh, has_ien, has_pupd, has_smt;\n> + u64 *pin_data = pin_desc->drv_data;\n\nHere you get pin_data, so below you will actually index\npctrl->desc.pins[pin_off].drv_data[]. That is not only confusing,\nbut also only works because pctrl->desc.pins[i].drv_data is initialized\nin rzg2l_pinctrl_register() like:\n\n pins[i].drv_data = &pin_data[i];\n\nAll these new variables (incl. pin_off) are only used inside the new\nif () below, so please confine everything to that block.\n\n> u32 off, caps;\n> u8 pincnt;\n> u64 cfg;\n> @@ -3012,6 +3015,11 @@ static void rzg2l_pinctrl_pm_setup_regs(struct rzg2l_pinctrl *pctrl, bool suspen\n> off = RZG2L_PIN_CFG_TO_PORT_OFFSET(cfg);\n> pincnt = hweight8(FIELD_GET(PIN_CFG_PIN_MAP_MASK, cfg));\n>\n> + if (cfg & RZG2L_VARIABLE_CFG) {\n> + for (unsigned int i = 1; i < RZG2L_PINS_PER_PORT; i++)\n\nShouldn't the loop start at zero? The PIN_CFG_MASK part of a variable\nconfig is always zero.\n\n> + cfg |= *pin_data++;\n\nPlease use pctrl->desc.pins[pin_off + i].drv_data here.\nAnd pin_off can be replaced by port * RZG2L_PINS_PER_PORT.\n\n> + }\n> +\n> caps = FIELD_GET(PIN_CFG_MASK, cfg);\n> has_iolh = !!(caps & (PIN_CFG_IOLH_A | PIN_CFG_IOLH_B | PIN_CFG_IOLH_C));\n> has_ien = !!(caps & PIN_CFG_IEN);\n\nGr{oetje,eeting}s,\n\n Geert\n\n\n--\nGeert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org\n\nIn personal conversations with technical people, I call myself a hacker. But\nwhen I'm talking to journalists I just say \"programmer\" or something like that.\n -- Linus Torvalds","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-gpio@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=104.64.211.4; helo=sin.lore.kernel.org;\n envelope-from=linux-gpio+bounces-34205-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n arc=none smtp.client-ip=209.85.221.180","smtp.subspace.kernel.org;\n dmarc=none (p=none dis=none) header.from=linux-m68k.org","smtp.subspace.kernel.org;\n spf=pass smtp.mailfrom=gmail.com"],"Received":["from sin.lore.kernel.org (sin.lore.kernel.org [104.64.211.4])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fhMMR5slgz1y1G\n\tfor ; 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Extend the code to also support ports\n> > with variable pincfg per pin, so that {IOLH,IEN,PUPD,SMT} registers\n> > are correctly saved and restored for all pins.\n> >\n> > Fixes: 254203f9a94c (\"pinctrl: renesas: rzg2l: Add suspend/resume\n> > support\")\n> > Signed-off-by: Biju Das \n> \n> Thanks for the update!\n> \n> > ---\n> > v1->v2:\n> > * Updated commit description\n> > * Improved the logic.\n> \n> You also fixed the double application of the pin_off index, right?\n\nYes, it is my mistake, I haven't looked the proposed code during\nour internal review as the testing showed the results are OK with ethernet OEN \nPins during suspend/resume cycle of s2ram.\n\n> \n> > --- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c\n> > +++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c\n> > @@ -3001,9 +3001,12 @@ static void rzg2l_pinctrl_pm_setup_regs(struct\n> > rzg2l_pinctrl *pctrl, bool suspen {\n> > u32 nports = pctrl->data->n_port_pins / RZG2L_PINS_PER_PORT;\n> > struct rzg2l_pinctrl_reg_cache *cache = pctrl->cache;\n> > + u32 pin_off = 0;\n> >\n> > - for (u32 port = 0; port < nports; port++) {\n> > + for (u32 port = 0; port < nports; port++, pin_off += RZG2L_PINS_PER_PORT) {\n> > + const struct pinctrl_pin_desc *pin_desc =\n> > + &pctrl->desc.pins[pin_off];\n> \n> Here you index pctrl->desc.pins[]...\n\nOK.\n> \n> > bool has_iolh, has_ien, has_pupd, has_smt;\n> > + u64 *pin_data = pin_desc->drv_data;\n> \n> Here you get pin_data, so below you will actually index\n> pctrl->desc.pins[pin_off].drv_data[]. That is not only confusing,\n> but also only works because pctrl->desc.pins[i].drv_data is initialized in rzg2l_pinctrl_register()\n> like:\n> \n> pins[i].drv_data = &pin_data[i];\n> \n> All these new variables (incl. pin_off) are only used inside the new if () below, so please confine\n> everything to that block.\n\nOK.\n> \n> > u32 off, caps;\n> > u8 pincnt;\n> > u64 cfg;\n> > @@ -3012,6 +3015,11 @@ static void rzg2l_pinctrl_pm_setup_regs(struct rzg2l_pinctrl *pctrl, bool\n> suspen\n> > off = RZG2L_PIN_CFG_TO_PORT_OFFSET(cfg);\n> > pincnt = hweight8(FIELD_GET(PIN_CFG_PIN_MAP_MASK,\n> > cfg));\n> >\n> > + if (cfg & RZG2L_VARIABLE_CFG) {\n> > + for (unsigned int i = 1; i <\n> > + RZG2L_PINS_PER_PORT; i++)\n> \n> Shouldn't the loop start at zero? The PIN_CFG_MASK part of a variable config is always zero.\n> \n> > + cfg |= *pin_data++;\n> \n> Please use pctrl->desc.pins[pin_off + i].drv_data here.\n> And pin_off can be replaced by port * RZG2L_PINS_PER_PORT.\n\n\nOK, will replace it as in the next version as below\n\n+\t\tif (cfg & RZG2L_VARIABLE_CFG) {\n+\t\t\tunsigned int pin = port * RZG2L_PINS_PER_PORT;\n+\n+\t\t\tfor (unsigned int i = 0; i < RZG2L_PINS_PER_PORT; i++)\n+\t\t\t\tcfg |= *(u64 *)pctrl->desc.pins[ pin + i ].drv_data;\n+\t\t}\n+\n\nCheers,\nBiju","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-gpio@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=bp.renesas.com header.i=@bp.renesas.com\n header.a=rsa-sha256 header.s=selector1 header.b=XfZIVBhx;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=172.234.253.10; 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