linux-kernel - Re: [PATCH] ARM: OMAP: DTS: N900: fix onenand timings

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Date:   Mon, 9 Mar 2020 11:43:22 +0200
From:   Roger Quadros <rogerq@...com>
To:     Arthur Demchenkov <spinal.by@...il.com>
CC:     Benoît Cousson <bcousson@...libre.com>,
        Tony Lindgren <tony@...mide.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Ladislav Michl <ladis@...ux-mips.org>,
        <linux-omap@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: OMAP: DTS: N900: fix onenand timings



On 08/03/2020 21:19, Arthur Demchenkov wrote:
> Commit a758f50f10cf ("mtd: onenand: omap2: Configure driver from DT")
> started using DT specified timings for GPMC, and as a result the
> OneNAND stopped working on N900 as we had wrong values in the DT.
> Fix by updating the values to bootloader timings that have been tested
> to be working on Nokia N900 with OneNAND manufacturers: Samsung,
> Numonyx.
> 
> Fixes: a758f50f10cf ("mtd: onenand: omap2: Configure driver from DT")
> Signed-off-by: Arthur Demchenkov <spinal.by@...il.com>

Reviewed-by: Roger Quadros <rogerq@...com>

> ---
>   arch/arm/boot/dts/omap3-n900.dts | 44 +++++++++++++++++++++++++---------------
>   1 file changed, 28 insertions(+), 16 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/omap3-n900.dts b/arch/arm/boot/dts/omap3-n900.dts
> index c3c6d7d04a76..4089d97405c9 100644
> --- a/arch/arm/boot/dts/omap3-n900.dts
> +++ b/arch/arm/boot/dts/omap3-n900.dts
> @@ -854,34 +854,46 @@
>   		compatible = "ti,omap2-onenand";
>   		reg = <0 0 0x20000>;	/* CS0, offset 0, IO size 128K */
>   
> +		/*
> +		 * These timings are based on CONFIG_OMAP_GPMC_DEBUG=y reported
> +		 * bootloader set values when booted with v5.1
> +		 * (OneNAND Manufacturer: Samsung):
> +		 *
> +		 *   cs0 GPMC_CS_CONFIG1: 0xfb001202
> +		 *   cs0 GPMC_CS_CONFIG2: 0x00111100
> +		 *   cs0 GPMC_CS_CONFIG3: 0x00020200
> +		 *   cs0 GPMC_CS_CONFIG4: 0x11001102
> +		 *   cs0 GPMC_CS_CONFIG5: 0x03101616
> +		 *   cs0 GPMC_CS_CONFIG6: 0x90060000
> +		 */
>   		gpmc,sync-read;
>   		gpmc,sync-write;
>   		gpmc,burst-length = <16>;
>   		gpmc,burst-read;
>   		gpmc,burst-wrap;
>   		gpmc,burst-write;
> -		gpmc,device-width = <2>; /* GPMC_DEVWIDTH_16BIT */
> -		gpmc,mux-add-data = <2>; /* GPMC_MUX_AD */
> +		gpmc,device-width = <2>;
> +		gpmc,mux-add-data = <2>;
>   		gpmc,cs-on-ns = <0>;
> -		gpmc,cs-rd-off-ns = <87>;
> -		gpmc,cs-wr-off-ns = <87>;
> +		gpmc,cs-rd-off-ns = <102>;
> +		gpmc,cs-wr-off-ns = <102>;
>   		gpmc,adv-on-ns = <0>;
> -		gpmc,adv-rd-off-ns = <10>;
> -		gpmc,adv-wr-off-ns = <10>;
> -		gpmc,oe-on-ns = <15>;
> -		gpmc,oe-off-ns = <87>;
> +		gpmc,adv-rd-off-ns = <12>;
> +		gpmc,adv-wr-off-ns = <12>;
> +		gpmc,oe-on-ns = <12>;
> +		gpmc,oe-off-ns = <102>;
>   		gpmc,we-on-ns = <0>;
> -		gpmc,we-off-ns = <87>;
> -		gpmc,rd-cycle-ns = <112>;
> -		gpmc,wr-cycle-ns = <112>;
> -		gpmc,access-ns = <81>;
> -		gpmc,page-burst-access-ns = <15>;
> +		gpmc,we-off-ns = <102>;
> +		gpmc,rd-cycle-ns = <132>;
> +		gpmc,wr-cycle-ns = <132>;
> +		gpmc,access-ns = <96>;
> +		gpmc,page-burst-access-ns = <18>;
>   		gpmc,bus-turnaround-ns = <0>;
>   		gpmc,cycle2cycle-delay-ns = <0>;
>   		gpmc,wait-monitoring-ns = <0>;
> -		gpmc,clk-activation-ns = <5>;
> -		gpmc,wr-data-mux-bus-ns = <30>;
> -		gpmc,wr-access-ns = <81>;
> +		gpmc,clk-activation-ns = <6>;
> +		gpmc,wr-data-mux-bus-ns = <36>;
> +		gpmc,wr-access-ns = <96>;
>   		gpmc,sync-clk-ps = <15000>;
>   
>   		/*
> 

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