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Date: Tue, 13 Dec 2022 16:45:14 +0800
From: Victor Shih <victorshihgli@...il.com>
To: Adrian Hunter <adrian.hunter@...el.com>
Cc: ulf.hansson@...aro.org, linux-mmc@...r.kernel.org,
linux-kernel@...r.kernel.org, benchuanggli@...il.com,
HL.Liu@...esyslogic.com.tw, Greg.tu@...esyslogic.com.tw,
takahiro.akashi@...aro.org, dlunev@...omium.org,
Victor Shih <victor.shih@...esyslogic.com.tw>,
Ben Chuang <ben.chuang@...esyslogic.com.tw>
Subject: Re: [PATCH V5 08/26] mmc: sdhci: add UHS-II related definitions in headers
Hi, Adrian
On Wed, Nov 2, 2022 at 1:12 AM Adrian Hunter <adrian.hunter@...el.com> wrote:
>
> On 19/10/22 14:06, Victor Shih wrote:
> > Add UHS-II related definitions in shdci.h and sdhci-uhs2.h.
> >
> > Signed-off-by: Ben Chuang <ben.chuang@...esyslogic.com.tw>
> > Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
> > Signed-off-by: Victor Shih <victor.shih@...esyslogic.com.tw>
> > ---
>
> I hope you don't mind, but some of the names seem a bit long,
> or could be more like regular SDHCI equivalents. Also
> BIT() anf GENMASK() could be used more in some cases. See
> comments below.
>
> > drivers/mmc/host/sdhci-uhs2.h | 210 ++++++++++++++++++++++++++++++++++
> > drivers/mmc/host/sdhci.h | 73 +++++++++++-
> > 2 files changed, 282 insertions(+), 1 deletion(-)
> > create mode 100644 drivers/mmc/host/sdhci-uhs2.h
> >
> > diff --git a/drivers/mmc/host/sdhci-uhs2.h b/drivers/mmc/host/sdhci-uhs2.h
> > new file mode 100644
> > index 000000000000..5610affebdf3
> > --- /dev/null
> > +++ b/drivers/mmc/host/sdhci-uhs2.h
> > @@ -0,0 +1,210 @@
> > +/* SPDX-License-Identifier: GPL-2.0-or-later */
> > +/*
> > + * linux/drivers/mmc/host/sdhci-uhs2.h - Secure Digital Host Controller
> > + * Interface driver
> > + *
> > + * Header file for Host Controller UHS2 related registers and I/O accessors.
>
> I/O accessors?
>
I will update it in the patch#7 of the new [PATCH V6].
> > + *
> > + * Copyright (C) 2014 Intel Corp, All Rights Reserved.
> > + */
> > +#ifndef __SDHCI_UHS2_H
> > +#define __SDHCI_UHS2_H
> > +
> > +#include <linux/bits.h>
> > +
> > +/*
> > + * UHS-II Controller registers
> > + * 0x74 preset in sdhci.h
> > + * 0x80
> > + * 0x84-0xB4
> > + * 0xB8-0xCF
> > + * 0xE0-0xE7
> > + */
> > +/* UHS2 */
>
> Rather than above, let's just have one simple comment:
>
> /* SDHCI Category B registers : UHS2 only */
>
I will update it in the patch#7 of the new [PATCH V6].
> > +#define SDHCI_UHS2_BLOCK_SIZE 0x80
> > +#define SDHCI_UHS2_MAKE_BLKSZ(dma, blksz) \
> > + ((((dma) & 0x7) << 12) | ((blksz) & 0xFFF))
>
> I would prefer to wrap only lines over 100 columns
>
I will update it in the patch#7 of the new [PATCH V6].
> > +
> > +#define SDHCI_UHS2_BLOCK_COUNT 0x84
> > +
> > +#define SDHCI_UHS2_CMD_PACKET 0x88
> > +#define SDHCI_UHS2_CMD_PACK_MAX_LEN 20
> > +
> > +#define SDHCI_UHS2_TRANS_MODE 0x9C
> > +#define SDHCI_UHS2_TRNS_DMA BIT(0)
> > +#define SDHCI_UHS2_TRNS_BLK_CNT_EN BIT(1)
> > +#define SDHCI_UHS2_TRNS_DATA_TRNS_WRT BIT(4)
> > +#define SDHCI_UHS2_TRNS_BLK_BYTE_MODE BIT(5)
> > +#define SDHCI_UHS2_TRNS_RES_R5 BIT(6)
> > +#define SDHCI_UHS2_TRNS_RES_ERR_CHECK_EN BIT(7)
> > +#define SDHCI_UHS2_TRNS_RES_INT_DIS BIT(8)
> > +#define SDHCI_UHS2_TRNS_WAIT_EBSY BIT(14)
> > +#define SDHCI_UHS2_TRNS_2L_HD BIT(15)
> > +
> > +#define SDHCI_UHS2_COMMAND 0x9E
>
> Please line up all the values. Also some names could be
> shortened. There are suggestions in the comments below.
>
I will update it in the patch#7 of the new [PATCH V6].
> > +#define SDHCI_UHS2_COMMAND_SUB_CMD 0x0004
>
> Please use BIT() and GENMASK() macros here and elsewhere.
>
> Also could keep the name "SDHCI_UHS2_COMMAND" for the
> register but abbreviate "COMMAND" to "CMD" for the fields.
> SDHCI_COMMAND register does it that way.
>
I will update it in the patch#7 of the new [PATCH V6].
> > +#define SDHCI_UHS2_COMMAND_DATA 0x0020
> > +#define SDHCI_UHS2_COMMAND_TRNS_ABORT 0x0040
> > +#define SDHCI_UHS2_COMMAND_CMD12 0x0080
> > +#define SDHCI_UHS2_COMMAND_DORMANT 0x00C0
> > +#define SDHCI_UHS2_COMMAND_PACK_LEN_MASK GENMASK(12, 8)
> > +#define SDHCI_UHS2_COMMAND_PACK_LEN_SHIFT 8
>
> If possible, please avoid macros for shift value.
> Instead use FIELD_GET() and FIELD_PREP(), or even
> __bf_shf() if FIELD_GET() and FIELD_PREP() don't
> work.
>
I will update it in the patch#7 of the new [PATCH V6].
> > +
> > +#define SDHCI_UHS2_RESPONSE 0xA0
> > +#define SDHCI_UHS2_RESPONSE_MAX_LEN 20
> > +
> > +#define SDHCI_UHS2_MSG_SELECT 0xB4
> > +#define SDHCI_UHS2_MSG_SELECT_CURR 0x0
> > +#define SDHCI_UHS2_MSG_SELECT_ONE 0x1
> > +#define SDHCI_UHS2_MSG_SELECT_TWO 0x2
> > +#define SDHCI_UHS2_MSG_SELECT_THREE 0x3
> > +
> > +#define SDHCI_UHS2_MSG 0xB8
> > +
> > +#define SDHCI_UHS2_DEV_INT_STATUS 0xBC
> > +
> > +#define SDHCI_UHS2_DEV_SELECT 0xBE
> > +#define SDHCI_UHS2_DEV_SELECT_DEV_SEL_MASK GENMASK(3, 0)
>
> Perhaps just SDHCI_UHS2_DEV_SEL_MASK
>
I will update it in the patch#7 of the new [PATCH V6].
> > +#define SDHCI_UHS2_DEV_SELECT_INT_MSG_EN BIT(7)
>
> Perhaps just SDHCI_UHS2_DEV_SEL_INT_MSG_EN
>
I will update it in the patch#7 of the new [PATCH V6].
> > +
> > +#define SDHCI_UHS2_DEV_INT_CODE 0xBF
> > +
> > +#define SDHCI_UHS2_SW_RESET 0xC0
> > +#define SDHCI_UHS2_SW_RESET_FULL 0x0001
> > +#define SDHCI_UHS2_SW_RESET_SD 0x0002
>
> Please use BIT() macros
>
I will update it in the patch#7 of the new [PATCH V6].
> > +
> > +#define SDHCI_UHS2_TIMER_CTRL 0xC2
> > +#define SDHCI_UHS2_TIMER_CTRL_DEADLOCK_SHIFT 4
>
> Please use GENMASK()
>
I will update it in the patch#7 of the new [PATCH V6].
> > +
> > +#define SDHCI_UHS2_ERR_INT_STATUS 0xC4
> > +#define SDHCI_UHS2_ERR_INT_STATUS_EN 0xC8
> > +#define SDHCI_UHS2_ERR_INT_SIG_EN 0xCC
>
> Let's make those 3 more like regular SDHCI names i.e.
>
> #define SDHCI_UHS2_INT_STATUS 0xC4
> #define SDHCI_UHS2_INT_STATUS_ENABLE 0xC8
> #define SDHCI_UHS2_INT_SIGNAL_ENABLE 0xCC
>
I will update it in the patch#7 of the new [PATCH V6].
> > +#define SDHCI_UHS2_ERR_INT_STATUS_HEADER BIT(0)
> > +#define SDHCI_UHS2_ERR_INT_STATUS_RES BIT(1)
> > +#define SDHCI_UHS2_ERR_INT_STATUS_RETRY_EXP BIT(2)
> > +#define SDHCI_UHS2_ERR_INT_STATUS_CRC BIT(3)
> > +#define SDHCI_UHS2_ERR_INT_STATUS_FRAME BIT(4)
> > +#define SDHCI_UHS2_ERR_INT_STATUS_TID BIT(5)
> > +#define SDHCI_UHS2_ERR_INT_STATUS_UNRECOVER BIT(7)
> > +#define SDHCI_UHS2_ERR_INT_STATUS_EBUSY BIT(8)
> > +#define SDHCI_UHS2_ERR_INT_STATUS_ADMA BIT(15)
> > +#define SDHCI_UHS2_ERR_INT_STATUS_RES_TIMEOUT BIT(16)
> > +#define SDHCI_UHS2_ERR_INT_STATUS_DEADLOCK_TIMEOUT BIT(17)
> > +#define SDHCI_UHS2_ERR_INT_STATUS_VENDOR BIT(27)
>
> Again, let's make the interrupt bits above more like regular SDHCI
> names i.e.
>
> #define SDHCI_UHS2_INT_HEADER_ERR BIT(0)
> #define SDHCI_UHS2_INT_RES_ERR BIT(1)
> #define SDHCI_UHS2_INT_RETRY_EXP BIT(2)
> #define SDHCI_UHS2_INT_CRC BIT(3)
> #define SDHCI_UHS2_INT_FRAME_ERR BIT(4)
> #define SDHCI_UHS2_INT_TID_ERR BIT(5)
> #define SDHCI_UHS2_INT_UNRECOVERABLE BIT(7)
> #define SDHCI_UHS2_INT_EBUSY_ERR BIT(8)
> #define SDHCI_UHS2_INT_ADMA_ERROR BIT(15)
> #define SDHCI_UHS2_INT_CMD_TIMEOUT BIT(16)
> #define SDHCI_UHS2_INT_DEADLOCK_TIMEOUT BIT(17)
> #define SDHCI_UHS2_INT_VENDOR_ERR BIT(27)
>
I will update it in the patch#7 of the new [PATCH V6].
> > +#define SDHCI_UHS2_ERR_INT_STATUS_MASK \
>
> More like regular SDHCI name
>
> #define SDHCI_UHS2_INT_ERROR_MASK
>
I will update it in the patch#7 of the new [PATCH V6].
> > + (SDHCI_UHS2_ERR_INT_STATUS_HEADER | \
> > + SDHCI_UHS2_ERR_INT_STATUS_RES | \
> > + SDHCI_UHS2_ERR_INT_STATUS_RETRY_EXP | \
> > + SDHCI_UHS2_ERR_INT_STATUS_CRC | \
> > + SDHCI_UHS2_ERR_INT_STATUS_FRAME | \
> > + SDHCI_UHS2_ERR_INT_STATUS_TID | \
> > + SDHCI_UHS2_ERR_INT_STATUS_UNRECOVER | \
> > + SDHCI_UHS2_ERR_INT_STATUS_EBUSY | \
> > + SDHCI_UHS2_ERR_INT_STATUS_ADMA | \
> > + SDHCI_UHS2_ERR_INT_STATUS_RES_TIMEOUT | \
> > + SDHCI_UHS2_ERR_INT_STATUS_DEADLOCK_TIMEOUT)
> > +#define SDHCI_UHS2_ERR_INT_STATUS_CMD_MASK \
>
> SDHCI_UHS2_INT_CMD_ERR_MASK
>
I will update it in the patch#7 of the new [PATCH V6].
> > + (SDHCI_UHS2_ERR_INT_STATUS_HEADER | \
> > + SDHCI_UHS2_ERR_INT_STATUS_RES | \
> > + SDHCI_UHS2_ERR_INT_STATUS_FRAME | \
> > + SDHCI_UHS2_ERR_INT_STATUS_TID | \
> > + SDHCI_UHS2_ERR_INT_STATUS_RES_TIMEOUT)
> > +/* CRC Error occurs during a packet receiving */
> > +#define SDHCI_UHS2_ERR_INT_STATUS_DATA_MASK \
>
> SDHCI_UHS2_INT_DATA_ERR_MASK
>
I will update it in the patch#7 of the new [PATCH V6].
> > + (SDHCI_UHS2_ERR_INT_STATUS_RETRY_EXP | \
> > + SDHCI_UHS2_ERR_INT_STATUS_CRC | \
> > + SDHCI_UHS2_ERR_INT_STATUS_UNRECOVER | \
> > + SDHCI_UHS2_ERR_INT_STATUS_EBUSY | \
> > + SDHCI_UHS2_ERR_INT_STATUS_ADMA | \
> > + SDHCI_UHS2_ERR_INT_STATUS_DEADLOCK_TIMEOUT)
> > +
> > +#define SDHCI_UHS2_SET_PTR 0xE0
>
> "SET" is not clear. "SETTINGS" would be better
>
> > +#define SDHCI_UHS2_GEN_SET_POWER_LOW 0x0001
>
> Please use BIT() macros
>
> > +#define SDHCI_UHS2_GEN_SET_N_LANES_POS 8
>
> Please use GENMASK()
>
> Also I would call this SDHCI_UHS2_LANES
>
I will update it in the patch#7 of the new [PATCH V6].
> > +#define SDHCI_UHS2_GEN_SET_2L_FD_HD 0x0
> > +#define SDHCI_UHS2_GEN_SET_2D1U_FD 0x2
> > +#define SDHCI_UHS2_GEN_SET_1D2U_FD 0x3
> > +#define SDHCI_UHS2_GEN_SET_2D2U_FD 0x4
>
> #define SDHCI_UHS2_FD_OR_2L_HD 0 /* 2 lanes */
> #define SDHCI_UHS2_2D1U_FD 2 /* 3 lanes, 2 down, 1 up, full duplex */
> #define SDHCI_UHS2_1D2U_FD 3 /* 3 lanes, 1 down, 2 up, full duplex */
> #define SDHCI_UHS2_2D2U_FD 4 /* 4 lanes, 2 down, 2 up, full duplex */
>
I will update it in the patch#7 of the new [PATCH V6].
> > +
> > +#define SDHCI_UHS2_PHY_SET_SPEED_POS 6
>
> Please use GENMASK()
>
> > +#define SDHCI_UHS2_PHY_SET_HIBER_EN BIT(12)
>
> HIBER -> HIBERNATE
>
I will update it in the patch#7 of the new [PATCH V6].
> > +#define SDHCI_UHS2_PHY_SET_N_LSS_SYN_MASK GENMASK(19, 16)
> > +#define SDHCI_UHS2_PHY_SET_N_LSS_SYN_POS 16
> > +#define SDHCI_UHS2_PHY_SET_N_LSS_DIR_MASK GENMASK(23, 20)
> > +#define SDHCI_UHS2_PHY_SET_N_LSS_DIR_POS 20
> > +
> > +#define SDHCI_UHS2_TRAN_SET_N_FCU_MASK GENMASK(15, 8)
> > +#define SDHCI_UHS2_TRAN_SET_N_FCU_POS 8
> > +#define SDHCI_UHS2_TRAN_SET_RETRY_CNT_MASK GENMASK(17, 16)
> > +#define SDHCI_UHS2_TRAN_SET_RETRY_CNT_POS 16
> > +
> > +#define SDHCI_UHS2_TRAN_SET_1_N_DAT_GAP_MASK GENMASK(7, 0)
>
> "_SET_" in the names above is not needed
>
> Also please do not use *_POS macros - use FEILD_GET()
> and FIELD_PREP()
>
I will update it in the patch#7 of the new [PATCH V6].
> > +
> > +#define SDHCI_UHS2_HOST_CAPS_PTR 0xE2
>
> To make them shorter, let's change all "SDHCI_UHS2_HOST_CAPS_"
> to "SDHCI_UHS2_CAP_"
>
> Also _GEN_ is a bit meaningless in the field names, and no
> _SHIFT please
>
I will update it in the patch#7 of the new [PATCH V6].
> > +#define SDHCI_UHS2_HOST_CAPS_GEN_OFFSET 0
> > +#define SDHCI_UHS2_HOST_CAPS_GEN_DAP_MASK GENMASK(3, 0)
> > +#define SDHCI_UHS2_HOST_CAPS_GEN_GAP_MASK GENMASK(7, 4)
> > +#define SDHCI_UHS2_HOST_CAPS_GEN_GAP(gap) ((gap) * 360)
> > +#define SDHCI_UHS2_HOST_CAPS_GEN_GAP_SHIFT 4
> > +#define SDHCI_UHS2_HOST_CAPS_GEN_LANE_MASK GENMASK(13, 8)
> > +#define SDHCI_UHS2_HOST_CAPS_GEN_LANE_SHIFT 8
> > +#define SDHCI_UHS2_HOST_CAPS_GEN_2L_HD_FD 1
> > +#define SDHCI_UHS2_HOST_CAPS_GEN_2D1U_FD 2
> > +#define SDHCI_UHS2_HOST_CAPS_GEN_1D2U_FD 4
> > +#define SDHCI_UHS2_HOST_CAPS_GEN_2D2U_FD 8
> > +#define SDHCI_UHS2_HOST_CAPS_GEN_ADDR_64 BIT(14)
> > +#define SDHCI_UHS2_HOST_CAPS_GEN_BOOT BIT(15)
> > +#define SDHCI_UHS2_HOST_CAPS_GEN_DEV_TYPE_MASK GENMASK(17, 16)
> > +#define SDHCI_UHS2_HOST_CAPS_GEN_DEV_TYPE_SHIFT 16
> > +#define SDHCI_UHS2_HOST_CAPS_GEN_DEV_TYPE_RMV 0
> > +#define SDHCI_UHS2_HOST_CAPS_GEN_DEV_TYPE_EMB 1
> > +#define SDHCI_UHS2_HOST_CAPS_GEN_DEV_TYPE_EMB_RMV 2
> > +#define SDHCI_UHS2_HOST_CAPS_GEN_NUM_DEV_MASK GENMASK(21, 18)
> > +#define SDHCI_UHS2_HOST_CAPS_GEN_NUM_DEV_SHIFT 18
> > +#define SDHCI_UHS2_HOST_CAPS_GEN_BUS_TOPO_MASK GENMASK(23, 22)
> > +#define SDHCI_UHS2_HOST_CAPS_GEN_BUS_TOPO_SHIFT 22
> > +#define SDHCI_UHS2_HOST_CAPS_GEN_BUS_TOPO_P2P 0
> > +#define SDHCI_UHS2_HOST_CAPS_GEN_BUS_TOPO_RING 1
> > +#define SDHCI_UHS2_HOST_CAPS_GEN_BUS_TOPO_HUB 2
> > +#define SDHCI_UHS2_HOST_CAPS_GEN_BUS_TOPO_HUB_RING 3
> > +
> > +#define SDHCI_UHS2_HOST_CAPS_PHY_OFFSET 4
> > +#define SDHCI_UHS2_HOST_CAPS_PHY_REV_MASK GENMASK(5, 0)
> > +#define SDHCI_UHS2_HOST_CAPS_PHY_RANGE_MASK GENMASK(7, 6)
> > +#define SDHCI_UHS2_HOST_CAPS_PHY_RANGE_SHIFT 6
> > +#define SDHCI_UHS2_HOST_CAPS_PHY_RANGE_A 0
> > +#define SDHCI_UHS2_HOST_CAPS_PHY_RANGE_B 1
> > +#define SDHCI_UHS2_HOST_CAPS_PHY_N_LSS_SYN_MASK GENMASK(19, 16)
> > +#define SDHCI_UHS2_HOST_CAPS_PHY_N_LSS_SYN_SHIFT 16
> > +#define SDHCI_UHS2_HOST_CAPS_PHY_N_LSS_DIR_MASK GENMASK(23, 20)
> > +#define SDHCI_UHS2_HOST_CAPS_PHY_N_LSS_DIR_SHIFT 20
> > +#define SDHCI_UHS2_HOST_CAPS_TRAN_OFFSET 8
> > +#define SDHCI_UHS2_HOST_CAPS_TRAN_LINK_REV_MASK GENMASK(5, 0)
> > +#define SDHCI_UHS2_HOST_CAPS_TRAN_N_FCU_MASK GENMASK(15, 8)
> > +#define SDHCI_UHS2_HOST_CAPS_TRAN_N_FCU_SHIFT 8
> > +#define SDHCI_UHS2_HOST_CAPS_TRAN_HOST_TYPE_MASK GENMASK(18, 16)
> > +#define SDHCI_UHS2_HOST_CAPS_TRAN_HOST_TYPE_SHIFT 16
> > +#define SDHCI_UHS2_HOST_CAPS_TRAN_BLK_LEN_MASK GENMASK(31, 20)
> > +#define SDHCI_UHS2_HOST_CAPS_TRAN_BLK_LEN_SHIFT 20
> > +
> > +#define SDHCI_UHS2_HOST_CAPS_TRAN_1_OFFSET 12
> > +#define SDHCI_UHS2_HOST_CAPS_TRAN_1_N_DATA_GAP_MASK GENMASK(7, 0)
> > +
> > +#define SDHCI_UHS2_TEST_PTR 0xE4
> > +#define SDHCI_UHS2_TEST_ERR_HEADER BIT(0)
> > +#define SDHCI_UHS2_TEST_ERR_RES BIT(1)
> > +#define SDHCI_UHS2_TEST_ERR_RETRY_EXP BIT(2)
> > +#define SDHCI_UHS2_TEST_ERR_CRC BIT(3)
> > +#define SDHCI_UHS2_TEST_ERR_FRAME BIT(4)
> > +#define SDHCI_UHS2_TEST_ERR_TID BIT(5)
> > +#define SDHCI_UHS2_TEST_ERR_UNRECOVER BIT(7)
> > +#define SDHCI_UHS2_TEST_ERR_EBUSY BIT(8)
> > +#define SDHCI_UHS2_TEST_ERR_ADMA BIT(15)
> > +#define SDHCI_UHS2_TEST_ERR_RES_TIMEOUT BIT(16)
> > +#define SDHCI_UHS2_TEST_ERR_DEADLOCK_TIMEOUT BIT(17)
> > +#define SDHCI_UHS2_TEST_ERR_VENDOR BIT(27)
>
> The Test register has the same bit fields as the interrupt
> registers, so we don't really need them do we?
>
I will delete it and update it in the patch#7 of the new [PATCH V6].
> > +
> > +#define SDHCI_UHS2_EMBED_CTRL 0xE6
> > +#define SDHCI_UHS2_VENDOR 0xE8
>
> For pointer registers like above 2, let's always name them *_PTR
>
I will update it in the patch#7 of the new [PATCH V6].
> > +
> > +#endif /* __SDHCI_UHS2_H */
> > diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> > index d750c464bd1e..bbed850241d4 100644
> > --- a/drivers/mmc/host/sdhci.h
> > +++ b/drivers/mmc/host/sdhci.h
> > @@ -43,8 +43,27 @@
> > #define SDHCI_TRNS_READ 0x10
> > #define SDHCI_TRNS_MULTI 0x20
> >
> > +/*
> > + * Defined in Host Version 4.10.
>
> Spec says version 4.0 not version 4.1
>
I will update it in the patch#7 of the new [PATCH V6].
> > + * 1 - R5 (SDIO)
> > + * 0 - R1 (Memory)
>
> Without reading the spec, it is not obvious what the above
> means, so please just remove it.
>
I will update it in the patch#7 of the new [PATCH V6].
> > + */
> > +#define SDHCI_TRNS_RES_TYPE 0x40
> > +#define SDHCI_TRNS_RES_ERR_CHECK 0x80
> > +#define SDHCI_TRNS_RES_INT_DIS 0x0100
> > +
> > #define SDHCI_COMMAND 0x0E
> > #define SDHCI_CMD_RESP_MASK 0x03
> > +
> > +/*
> > + * Host Version 4.10 adds this bit to distinguish a main command or
> > + * sub command.
> > + * CMD53(SDIO) - main command
> > + * CMD52(SDIO) - sub command which doesn't have data block or doesn't
> > + * indicate busy.
>
> This isn't very clear. How about just this instead:
>
> For example with SDIO, CMD52 (sub command) issued during CMD53 (main command)
>
I will update it in the patch#7 of the new [PATCH V6].
> > + */
> > +#define SDHCI_CMD_SUB_CMD 0x04
> > +
> > #define SDHCI_CMD_CRC 0x08
> > #define SDHCI_CMD_INDEX 0x10
> > #define SDHCI_CMD_DATA 0x20
> > @@ -60,11 +79,19 @@
> >
> > #define SDHCI_RESPONSE 0x10
> >
> > +#define SDHCI_RESPONSE_CM_TRAN_ABORT_OFFSET 0x10
> > +#define SDHCI_RESPONSE_CM_TRAN_ABORT_SIZE 4
> > +#define SDHCI_RESPONSE_SD_TRAN_ABORT_OFFSET 0x18
> > +#define SDHCI_RESPONSE_SD_TRAN_ABORT_SIZE 8
>
> These are UHS2 registers, so I would expect them in
> sdhci-uhs2.h. We don't put register sizes, and for
> 8-byte registers we add "_1" for the upper 4-bytes.
> i.e.
>
> #define SDHCI_UHS2_CM_TRAN_RESP 0x10
> #define SDHCI_UHS2_SD_TRAN_RESP 0x18
> #define SDHCI_UHS2_SD_TRAN_RESP_1 0x1C
>
I will update it in the patch#7 of the new [PATCH V6].
> > +
> > #define SDHCI_BUFFER 0x20
> >
> > #define SDHCI_PRESENT_STATE 0x24
> > #define SDHCI_CMD_INHIBIT 0x00000001
> > #define SDHCI_DATA_INHIBIT 0x00000002
> > +
> > +#define SDHCI_DATA_HIGH_LVL_MASK 0x000000F0
>
> "HIGH" is not that clear. Instead, what about:
>
> SDHCI_DAT_4_TO_7_LVL_MASK
>
I will update it in the patch#7 of the new [PATCH V6].
> > +
> > #define SDHCI_DOING_WRITE 0x00000100
> > #define SDHCI_DOING_READ 0x00000200
> > #define SDHCI_SPACE_AVAILABLE 0x00000400
> > @@ -80,6 +107,13 @@
> > #define SDHCI_DATA_0_LVL_MASK 0x00100000
> > #define SDHCI_CMD_LVL 0x01000000
> >
>
> /* Host Version 4.10 */
>
I will update it in the patch#7 of the new [PATCH V6].
> > +#define SDHCI_HOST_REGULATOR_STABLE 0x02000000
> > +#define SDHCI_CMD_NOT_ISSUE_ERR 0x08000000
>
> Please change:
> ISSUE -> ISSUED
>
I will update it in the patch#7 of the new [PATCH V6].
> > +#define SDHCI_SUB_CMD_STATUS 0x10000000
>
> > +#define SDHCI_UHS2_IN_DORMANT_STATE 0x20000000
> > +#define SDHCI_UHS2_LANE_SYNC 0x40000000
> > +#define SDHCI_UHS2_IF_DETECT 0x80000000
> > +
> > #define SDHCI_HOST_CONTROL 0x28
> > #define SDHCI_CTRL_LED 0x01
> > #define SDHCI_CTRL_4BITBUS 0x02
> > @@ -100,6 +134,11 @@
> > #define SDHCI_POWER_300 0x0C
> > #define SDHCI_POWER_330 0x0E
> >
> > +/* VDD2 - UHS2 */
>
> Please be more explicit here:
>
> /* VDD2 power on/off and voltage select (UHS2) */
>
I will update it in the patch#7 of the new [PATCH V6].
> > +#define SDHCI_VDD2_POWER_ON 0x10
> > +#define SDHCI_VDD2_POWER_180 0xA0
> > +#define SDHCI_VDD2_POWER_120 0x80
>
> Last 3 values could be lined up with further above.
>
I will update it in the patch#7 of the new [PATCH V6].
> > +
> > #define SDHCI_BLOCK_GAP_CONTROL 0x2A
> >
> > #define SDHCI_WAKE_UP_CONTROL 0x2B
> > @@ -110,7 +149,7 @@
> > #define SDHCI_CLOCK_CONTROL 0x2C
> > #define SDHCI_DIVIDER_SHIFT 8
> > #define SDHCI_DIVIDER_HI_SHIFT 6
> > -#define SDHCI_DIV_MASK 0xFF
> > +#define SDHCI_DIV_MASK 0xFF
> > #define SDHCI_DIV_MASK_LEN 8
> > #define SDHCI_DIV_HI_MASK 0x300
> > #define SDHCI_PROG_CLOCK_MODE 0x0020
> > @@ -139,6 +178,10 @@
> > #define SDHCI_INT_CARD_REMOVE 0x00000080
> > #define SDHCI_INT_CARD_INT 0x00000100
> > #define SDHCI_INT_RETUNE 0x00001000
> > +
> > +/* Host Version 4.10 */
> > +#define SDHCI_INT_FX_EVENT 0x00002000
> > +
> > #define SDHCI_INT_CQE 0x00004000
> > #define SDHCI_INT_ERROR 0x00008000
> > #define SDHCI_INT_TIMEOUT 0x00010000
> > @@ -152,6 +195,9 @@
> > #define SDHCI_INT_AUTO_CMD_ERR 0x01000000
> > #define SDHCI_INT_ADMA_ERROR 0x02000000
> >
> > +/* Host Version 4.0 */
> > +#define SDHCI_INT_RESPONSE_ERROR 0x08000000
>
> Could be shorter:
>
> SDHCI_INT_RESPONSE_ERROR -> SDHCI_INT_RESP_ERR
>
I will update it in the patch#7 of the new [PATCH V6].
> > +
> > #define SDHCI_INT_NORMAL_MASK 0x00007FFF
> > #define SDHCI_INT_ERROR_MASK 0xFFFF8000
> >
> > @@ -178,6 +224,9 @@
> > #define SDHCI_AUTO_CMD_END_BIT 0x00000008
> > #define SDHCI_AUTO_CMD_INDEX 0x00000010
> >
> > +/* Host Version 4.10 */
> > +#define SDHCI_ACMD_RESPONSE_ERROR 0x0020
>
> Could be shorter:
>
> SDHCI_ACMD_RESPONSE_ERROR -> SDHCI_AUTO_CMD_RESP_ERR
>
I will update it in the patch#7 of the new [PATCH V6].
> > +
> > #define SDHCI_HOST_CONTROL2 0x3E
> > #define SDHCI_CTRL_UHS_MASK 0x0007
> > #define SDHCI_CTRL_UHS_SDR12 0x0000
> > @@ -186,6 +235,7 @@
> > #define SDHCI_CTRL_UHS_SDR104 0x0003
> > #define SDHCI_CTRL_UHS_DDR50 0x0004
> > #define SDHCI_CTRL_HS400 0x0005 /* Non-standard */
> > +#define SDHCI_CTRL_UHS_2 0x0007 /* UHS-2 */
>
> We are using UHS2 in other places, so do it here too:
>
> SDHCI_CTRL_UHS_2 -> SDHCI_CTRL_UHS2
>
> Also the comment /* UHS-2 */ is not needed
>
I will update it in the patch#7 of the new [PATCH V6].
> > #define SDHCI_CTRL_VDD_180 0x0008
> > #define SDHCI_CTRL_DRV_TYPE_MASK 0x0030
> > #define SDHCI_CTRL_DRV_TYPE_B 0x0000
> > @@ -194,9 +244,12 @@
> > #define SDHCI_CTRL_DRV_TYPE_D 0x0030
> > #define SDHCI_CTRL_EXEC_TUNING 0x0040
> > #define SDHCI_CTRL_TUNED_CLK 0x0080
> > +#define SDHCI_CTRL_UHS2_INTERFACE_EN 0x0100 /* UHS-2 */
>
> Already have "SDHCI_CTRL_PRESET_VAL_ENABLE" so let's
> spell out ENABLE here too.
>
> SDHCI_CTRL_UHS2_INTERFACE_EN -> SDHCI_CTRL_UHS2_ENABLE
>
> Also the comment /* UHS-2 */ is not needed
>
> > +#define SDHCI_CTRL_ADMA2_LEN_MODE 0x0400
> > #define SDHCI_CMD23_ENABLE 0x0800
> > #define SDHCI_CTRL_V4_MODE 0x1000
> > #define SDHCI_CTRL_64BIT_ADDR 0x2000
> > +#define SDHCI_CTRL_ASYNC_INT_EN 0x4000
>
> Ditto
>
> SDHCI_CTRL_ASYNC_INT_EN -> SDHCI_CTRL_ASYNC_INT_ENABLE
>
I will update it in the patch#7 of the new [PATCH V6].
> > #define SDHCI_CTRL_PRESET_VAL_ENABLE 0x8000
> >
> > #define SDHCI_CAPABILITIES 0x40
> > @@ -219,11 +272,13 @@
> > #define SDHCI_CAN_VDD_180 0x04000000
> > #define SDHCI_CAN_64BIT_V4 0x08000000
> > #define SDHCI_CAN_64BIT 0x10000000
> > +#define SDHCI_CAN_ASYNC_INT 0x20000000
> >
> > #define SDHCI_CAPABILITIES_1 0x44
> > #define SDHCI_SUPPORT_SDR50 0x00000001
> > #define SDHCI_SUPPORT_SDR104 0x00000002
> > #define SDHCI_SUPPORT_DDR50 0x00000004
> > +#define SDHCI_SUPPORT_UHS2 0x00000008 /* UHS-2 support */
>
> Please remove the comment - the name says it all.
>
I will update it in the patch#7 of the new [PATCH V6].
> > #define SDHCI_DRIVER_TYPE_A 0x00000010
> > #define SDHCI_DRIVER_TYPE_C 0x00000020
> > #define SDHCI_DRIVER_TYPE_D 0x00000040
> > @@ -232,19 +287,28 @@
> > #define SDHCI_RETUNING_MODE_MASK GENMASK(15, 14)
> > #define SDHCI_CLOCK_MUL_MASK GENMASK(23, 16)
> > #define SDHCI_CAN_DO_ADMA3 0x08000000
> > +#define SDHCI_SUPPORT_VDD2_180 0x10000000 /* UHS-2 1.8V VDD2 */
>
> Better to be like VDD bit names i.e.
>
> SDHCI_SUPPORT_VDD2_180 -> SDHCI_CAN_VDD2_180
>
> > +#define SDHCI_RSVD_FOR_VDD2 0x20000000 /* Rsvd for future VDD2 */
>
> Please drop SDHCI_RSVD_FOR_VDD2
>
I will update it in the patch#7 of the new [PATCH V6].
> > #define SDHCI_SUPPORT_HS400 0x80000000 /* Non-standard */
> >
> > #define SDHCI_MAX_CURRENT 0x48
> > +#define SDHCI_MAX_CURRENT_1 0x4C
>
> Let's put SDHCI_MAX_CURRENT_1 just above
> SDHCI_MAX_CURRENT_VDD2_180_MASK
>
I will update it in the patch#7 of the new [PATCH V6].
> > #define SDHCI_MAX_CURRENT_LIMIT GENMASK(7, 0)
> > #define SDHCI_MAX_CURRENT_330_MASK GENMASK(7, 0)
> > #define SDHCI_MAX_CURRENT_300_MASK GENMASK(15, 8)
> > #define SDHCI_MAX_CURRENT_180_MASK GENMASK(23, 16)
> > +#define SDHCI_MAX_CURRENT_VDD2_180_MASK GENMASK(7, 0) /* UHS2 */
> > #define SDHCI_MAX_CURRENT_MULTIPLIER 4
> >
> > /* 4C-4F reserved for more max current */
> >
> > #define SDHCI_SET_ACMD12_ERROR 0x50
> > +/* Host Version 4.10 */
> > +#define SDHCI_SET_ACMD_RESPONSE_ERROR 0x20
>
> This isn't being used is it? Then let's leave it out.
>
I will update it in the patch#7 of the new [PATCH V6].
> > #define SDHCI_SET_INT_ERROR 0x52
> > +/* Host Version 4.10 */
> > +#define SDHCI_SET_INT_TUNING_ERROR 0x0400
> > +#define SDHCI_SET_INT_RESPONSE_ERROR 0x0800
>
> These aren't being used are they? Then let's leave them out.
>
I will update it in the patch#7 of the new [PATCH V6].
> >
> > #define SDHCI_ADMA_ERROR 0x54
> >
> > @@ -262,10 +326,16 @@
> > #define SDHCI_PRESET_FOR_SDR104 0x6C
> > #define SDHCI_PRESET_FOR_DDR50 0x6E
> > #define SDHCI_PRESET_FOR_HS400 0x74 /* Non-standard */
> > +
> > +/* TODO: 0x74 is used for UHS2 in 4.10. How about HS400? */
> > +/* UHS2 */
>
> A host controller cannot be using it for both at the same time.
> The drivers should be able to sort it out if needed. For now,
> just remove your comments.
>
I will update it in the patch#7 of the new [PATCH V6].
> > +#define SDHCI_PRESET_FOR_UHS2 0x74
> > #define SDHCI_PRESET_DRV_MASK GENMASK(15, 14)
> > #define SDHCI_PRESET_CLKGEN_SEL BIT(10)
> > #define SDHCI_PRESET_SDCLK_FREQ_MASK GENMASK(9, 0)
> >
> > +#define SDHCI_ADMA3_ADDRESS 0x78
> > +
> > #define SDHCI_SLOT_INT_STATUS 0xFC
> >
> > #define SDHCI_HOST_VERSION 0xFE
> > @@ -659,6 +729,7 @@ struct sdhci_ops {
> > void (*request_done)(struct sdhci_host *host,
> > struct mmc_request *mrq);
> > void (*dump_vendor_regs)(struct sdhci_host *host);
> > + void (*dump_uhs2_regs)(struct sdhci_host *host);
>
> Please move this to patch "mmc: sdhci-uhs2: dump UHS-II registers"
>
I will update it in the patch#7 of the new [PATCH V6].
> > };
> >
> > #ifdef CONFIG_MMC_SDHCI_IO_ACCESSORS
>
Thanks, Victor Shih
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