From: <Claudiu.Beznea@microchip.com> To: <sboyd@kernel.org>, <alexandre.belloni@bootlin.com>, <Ludovic.Desroches@microchip.com>, <mturquette@baylibre.com>, <Nicolas.Ferre@microchip.com> Cc: <linux-clk@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>, <linux-kernel@vger.kernel.org> Subject: Re: [PATCH v4 02/17] clk: at91: pmc: execute suspend/resume only for backup mode Date: Fri, 8 Oct 2021 06:47:14 +0000 [thread overview] Message-ID: <3ac4d209-58a7-60f3-a3c1-7a44407bac03@microchip.com> (raw) In-Reply-To: <163366509609.2041162.16407625879723979586@swboyd.mtv.corp.google.com> On 08.10.2021 06:51, Stephen Boyd wrote: > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe > > Quoting Claudiu Beznea (2021-09-23 06:20:31) >> Before going to backup mode architecture specific PM code sets the first >> word in securam (file arch/arm/mach-at91/pm.c, function at91_pm_begin()). >> Thus take this into account when suspending/resuming clocks. This will >> avoid executing unnecessary instructions when suspending to non backup >> modes. Also this commit changed the postcore_initcall() with >> subsys_initcall() to be able to execute of_find_compatible_node() since >> this was not available at the moment of postcore_initcall(). This should >> not alter the tcb_clksrc since the changes are related to clocks >> suspend/resume procedure that will be executed at the user space request, >> thus long ago after subsys_initcall(). > > Is the comment still relevant though? For architecture PM code yes, the securam is set in [1]. Related to replacing postcore_init() with subsys_initcall() to be able to have the proper result of of_find_compatible_node() I have to re-check (don't know if something has been changed in this area since January). If you know something please let me know. [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm/mach-at91/pm.c#n290 > >> >> Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com> >> --- >> diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c >> index b2806946a77a..58e9c088cb22 100644 >> --- a/drivers/clk/at91/pmc.c >> +++ b/drivers/clk/at91/pmc.c >> @@ -110,13 +112,35 @@ struct pmc_data *pmc_data_allocate(unsigned int ncore, unsigned int nsystem, >> } >> >> #ifdef CONFIG_PM >> + >> +/* Address in SECURAM that say if we suspend to backup mode. */ >> +static void __iomem *at91_pmc_backup_suspend; >> + >> static int at91_pmc_suspend(void) >> { >> + unsigned int backup; >> + >> + if (!at91_pmc_backup_suspend) >> + return 0; >> + >> + backup = *(unsigned int *)at91_pmc_backup_suspend; > > This will fail sparse. Why are we reading iomem without using iomem > reading wrapper? By mistake. I'll switch to iomem reading wrapper. Is it OK to send soon a new version with these adjustments or do you have other patches in this series to review? Thank you, Claudiu Beznea > >> + if (!backup)
WARNING: multiple messages have this Message-ID (diff)
From: <Claudiu.Beznea@microchip.com> To: <sboyd@kernel.org>, <alexandre.belloni@bootlin.com>, <Ludovic.Desroches@microchip.com>, <mturquette@baylibre.com>, <Nicolas.Ferre@microchip.com> Cc: <linux-clk@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>, <linux-kernel@vger.kernel.org> Subject: Re: [PATCH v4 02/17] clk: at91: pmc: execute suspend/resume only for backup mode Date: Fri, 8 Oct 2021 06:47:14 +0000 [thread overview] Message-ID: <3ac4d209-58a7-60f3-a3c1-7a44407bac03@microchip.com> (raw) In-Reply-To: <163366509609.2041162.16407625879723979586@swboyd.mtv.corp.google.com> On 08.10.2021 06:51, Stephen Boyd wrote: > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe > > Quoting Claudiu Beznea (2021-09-23 06:20:31) >> Before going to backup mode architecture specific PM code sets the first >> word in securam (file arch/arm/mach-at91/pm.c, function at91_pm_begin()). >> Thus take this into account when suspending/resuming clocks. This will >> avoid executing unnecessary instructions when suspending to non backup >> modes. Also this commit changed the postcore_initcall() with >> subsys_initcall() to be able to execute of_find_compatible_node() since >> this was not available at the moment of postcore_initcall(). This should >> not alter the tcb_clksrc since the changes are related to clocks >> suspend/resume procedure that will be executed at the user space request, >> thus long ago after subsys_initcall(). > > Is the comment still relevant though? For architecture PM code yes, the securam is set in [1]. Related to replacing postcore_init() with subsys_initcall() to be able to have the proper result of of_find_compatible_node() I have to re-check (don't know if something has been changed in this area since January). If you know something please let me know. [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm/mach-at91/pm.c#n290 > >> >> Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com> >> --- >> diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c >> index b2806946a77a..58e9c088cb22 100644 >> --- a/drivers/clk/at91/pmc.c >> +++ b/drivers/clk/at91/pmc.c >> @@ -110,13 +112,35 @@ struct pmc_data *pmc_data_allocate(unsigned int ncore, unsigned int nsystem, >> } >> >> #ifdef CONFIG_PM >> + >> +/* Address in SECURAM that say if we suspend to backup mode. */ >> +static void __iomem *at91_pmc_backup_suspend; >> + >> static int at91_pmc_suspend(void) >> { >> + unsigned int backup; >> + >> + if (!at91_pmc_backup_suspend) >> + return 0; >> + >> + backup = *(unsigned int *)at91_pmc_backup_suspend; > > This will fail sparse. Why are we reading iomem without using iomem > reading wrapper? By mistake. I'll switch to iomem reading wrapper. Is it OK to send soon a new version with these adjustments or do you have other patches in this series to review? Thank you, Claudiu Beznea > >> + if (!backup) _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-10-08 6:47 UTC|newest] Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-09-23 13:20 [PATCH v4 00/17] clk: at91: updates for power management and dvfs Claudiu Beznea 2021-09-23 13:20 ` Claudiu Beznea 2021-09-23 13:20 ` [PATCH v4 01/17] clk: at91: re-factor clocks suspend/resume Claudiu Beznea 2021-09-23 13:20 ` Claudiu Beznea 2021-09-23 13:23 ` Claudiu.Beznea 2021-09-23 13:23 ` Claudiu.Beznea 2021-09-23 13:20 ` [PATCH v4 02/17] clk: at91: pmc: execute suspend/resume only for backup mode Claudiu Beznea 2021-09-23 13:20 ` Claudiu Beznea 2021-10-08 3:51 ` Stephen Boyd 2021-10-08 3:51 ` Stephen Boyd 2021-10-08 6:47 ` Claudiu.Beznea [this message] 2021-10-08 6:47 ` Claudiu.Beznea 2021-10-08 22:05 ` Stephen Boyd 2021-10-08 22:05 ` Stephen Boyd 2021-09-23 13:20 ` [PATCH v4 03/17] clk: at91: sama7g5: add securam's peripheral clock Claudiu Beznea 2021-09-23 13:20 ` Claudiu Beznea 2021-09-23 13:20 ` [PATCH v4 04/17] clk: at91: clk-master: add register definition for sama7g5's master clock Claudiu Beznea 2021-09-23 13:20 ` Claudiu Beznea 2021-09-23 13:20 ` [PATCH v4 05/17] clk: at91: clk-master: improve readability by using local variables Claudiu Beznea 2021-09-23 13:20 ` Claudiu Beznea 2021-09-23 13:20 ` [PATCH v4 06/17] clk: at91: pmc: add sama7g5 to the list of available pmcs Claudiu Beznea 2021-09-23 13:20 ` Claudiu Beznea 2021-09-23 13:20 ` [PATCH v4 07/17] clk: at91: sam9x60-pll: use DIV_ROUND_CLOSEST_ULL Claudiu Beznea 2021-09-23 13:20 ` Claudiu Beznea 2021-09-23 13:20 ` [PATCH v4 08/17] clk: at91: clk-master: check if div or pres is zero Claudiu Beznea 2021-09-23 13:20 ` Claudiu Beznea 2021-09-23 13:20 ` [PATCH v4 09/17] clk: at91: clk-master: mask mckr against layout->mask Claudiu Beznea 2021-09-23 13:20 ` Claudiu Beznea 2021-09-23 13:20 ` [PATCH v4 10/17] clk: at91: clk-master: fix prescaler logic Claudiu Beznea 2021-09-23 13:20 ` Claudiu Beznea 2021-09-23 13:20 ` [PATCH v4 11/17] clk: at91: clk-sam9x60-pll: add notifier for div part of PLL Claudiu Beznea 2021-09-23 13:20 ` Claudiu Beznea 2021-09-23 13:20 ` [PATCH v4 12/17] clk: at91: clk-master: add notifier for divider Claudiu Beznea 2021-09-23 13:20 ` Claudiu Beznea 2021-09-23 13:20 ` [PATCH v4 13/17] clk: at91: sama7g5: remove prescaler part of master clock Claudiu Beznea 2021-09-23 13:20 ` Claudiu Beznea 2021-09-23 13:20 ` [PATCH v4 14/17] clk: at91: sama7g5: set low limit for mck0 at 32KHz Claudiu Beznea 2021-09-23 13:20 ` Claudiu Beznea 2021-09-23 13:20 ` [PATCH v4 15/17] clk: use clk_core_get_rate_recalc() in clk_rate_get() Claudiu Beznea 2021-09-23 13:20 ` Claudiu Beznea 2021-09-23 13:20 ` [PATCH v4 16/17] clk: remove extra empty line Claudiu Beznea 2021-09-23 13:20 ` Claudiu Beznea 2021-10-08 3:54 ` Stephen Boyd 2021-10-08 3:54 ` Stephen Boyd 2021-09-23 13:20 ` [PATCH v4 17/17] clk: do not initialize ret Claudiu Beznea 2021-09-23 13:20 ` Claudiu Beznea 2021-10-08 3:55 ` Stephen Boyd 2021-10-08 3:55 ` Stephen Boyd
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