linux-kernel - Re: [PATCH v2] mmc: mtk-sd: Add condition to enable 'single' burst type

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Message-ID: <5312b72fb5f5575877b4ccccf38dd81f62a5fa66.camel@mediatek.com>
Date: Fri, 11 Apr 2025 05:46:10 +0000
From: Axe Yang (杨磊) <Axe.Yang@...iatek.com>
To: Andy-ld Lu (卢东) <Andy-ld.Lu@...iatek.com>,
	Wenbin Mei (梅文彬) <Wenbin.Mei@...iatek.com>,
	Yong Mao (毛勇) <yong.mao@...iatek.com>,
	Chaotian Jing (井朝天)
	<Chaotian.Jing@...iatek.com>, "matthias.bgg@...il.com"
	<matthias.bgg@...il.com>, "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
	Qingliang Li (黎晴亮) <Qingliang.Li@...iatek.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
CC: "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-mmc@...r.kernel.org"
	<linux-mmc@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linux-mediatek@...ts.infradead.org"
	<linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v2] mmc: mtk-sd: Add condition to enable 'single' burst
 type

On Thu, 2025-04-10 at 16:38 +0200, AngeloGioacchino Del Regno wrote:
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
> 
> 
> Il 10/04/25 09:52, Axe Yang ha scritto:
> > This change add a condition for 'single' burst type selection.
> > 
> > Read AXI_LEN field from EMMC50_CFG2(AHB2AXI wrapper) register, if
> > the
> > value is not 0, it means the HWIP is using AXI as AMBA bus, which
> > do
> > not support 'single' burst type.
> > 
> 
> You're missing a Suggested-by tag :-)
> 
> After adding it,
> Reviewed-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@...labora.com>
> 

Yeah, already resend v2 with 'Suggested-by' and 'Reviewed-by' TAG.
Thanks again for your suggestion.

Regards,
Axe

> > Signed-off-by: Axe Yang <axe.yang@...iatek.com>
> > ---
> > This change dependents on 'mmc: mtk-sd: Cleanups for register R/W':
> > 
> > 
https://urldefense.com/v3/__https://patchwork.kernel.org/project/linux-mediatek/cover/20250325110701.52623-1-angelogioacchino.delregno@collabora.com/__;!!CTRNKA9wMg0ARbw!nQUottrfGFsHiJvFRebS4Z7MRfbfLlNJmsTqBpgCZM8yRyu0CEGlDf09cUpSRXefka98k884lW_nb0btJ5Zvso18TkzRaMg$
> > ---
> >   drivers/mmc/host/mtk-sd.c | 16 ++++++++++++----
> >   1 file changed, 12 insertions(+), 4 deletions(-)
> > 
> > diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
> > index ceeae1aeac94..2e4bd5166c17 100644
> > --- a/drivers/mmc/host/mtk-sd.c
> > +++ b/drivers/mmc/host/mtk-sd.c
> > @@ -84,6 +84,7 @@
> >   #define EMMC51_CFG0  0x204
> >   #define EMMC50_CFG0      0x208
> >   #define EMMC50_CFG1      0x20c
> > +#define EMMC50_CFG2      0x21c
> >   #define EMMC50_CFG3      0x220
> >   #define SDC_FIFO_CFG     0x228
> >   #define CQHCI_SETTING        0x7fc
> > @@ -306,7 +307,10 @@
> >   /* EMMC50_CFG1 mask */
> >   #define EMMC50_CFG1_DS_CFG        BIT(28)  /* RW */
> > 
> > -#define EMMC50_CFG3_OUTS_WR       GENMASK(4, 0)  /* RW */
> > +/* EMMC50_CFG2 mask */
> > +#define EMMC50_CFG2_AXI_SET_LEN   GENMASK(27, 24) /* RW */
> > +
> > +#define EMMC50_CFG3_OUTS_WR       GENMASK(4, 0)   /* RW */
> > 
> >   #define SDC_FIFO_CFG_WRVALIDSEL   BIT(24)  /* RW */
> >   #define SDC_FIFO_CFG_RDVALIDSEL   BIT(25)  /* RW */
> > @@ -1917,9 +1921,13 @@ static void msdc_init_hw(struct msdc_host
> > *host)
> >       pb1_val |= FIELD_PREP(MSDC_PATCH_BIT1_CMDTA, 1);
> >       pb1_val |= MSDC_PB1_DDR_CMD_FIX_SEL;
> > 
> > -     /* Set single burst mode, auto sync state clear, block gap
> > stop clk */
> > -     pb1_val |= MSDC_PB1_SINGLE_BURST | MSDC_PB1_RSVD20 |
> > -                MSDC_PB1_AUTO_SYNCST_CLR |
> > MSDC_PB1_MARK_POP_WATER;
> > +     /* Support 'single' burst type only when AXI_LEN is 0 */
> > +     sdr_get_field(host->base + EMMC50_CFG2,
> > EMMC50_CFG2_AXI_SET_LEN, &val);
> > +     if (!val)
> > +             pb1_val |= MSDC_PB1_SINGLE_BURST;
> > +
> > +     /* Set auto sync state clear, block gap stop clk */
> > +     pb1_val |= MSDC_PB1_RSVD20 | MSDC_PB1_AUTO_SYNCST_CLR |
> > MSDC_PB1_MARK_POP_WATER;
> > 
> >       /* Set low power DCM, use HCLK for GDMA, use MSDC CLK for
> > everything else */
> >       pb1_val |= MSDC_PB1_LP_DCM_EN | MSDC_PB1_RSVD3 |
> 
>