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Date: Wed, 25 Jul 2018 10:48:09 +0300
From: Adrian Hunter <adrian.hunter@...el.com>
To: "ernest.zhang" <ernest.zhang@...hubtech.com>,
Ulf Hansson <ulf.hansson@...aro.org>,
linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: chuanjin.pang@...hubtech.com, mike.li@...hubtech.com,
chevron.li@...hubtech.com, shirley.her@...hubtech.com,
xiaoguang.yu@...hubtech.com, bobby.wu@...hubtech.com
Subject: Re: [PATCH V7 4/5] mmc: sdhci: Add support for O2 hardware tuning
On 16/07/18 09:26, ernest.zhang wrote:
> Add hardware tuning function instead of software tuning because O2/Bayhub
> SD host controller support hardware tuning.
>
> Signed-off-by: ernest.zhang <ernest.zhang@...hubtech.com>
Acked-by: Adrian Hunter <adrian.hunter@...el.com>
> ---
> Changes in V7:
> Move V6 change item 1 to a seperate patch.
>
> Changes in V6:
> 1. From module 'sdhci' export the symbols 'sdhci_start_tuning',
> 'sdhci_end_tuning','sdhci_send_tuning' and 'sdhci_reset_tuning'.
> 2. Remove local tuning related functions in sdhci-pci-o2-micro.c
> instead of above function exported in sdhci module.
> 3. Remove unneeded braces in function sdhci_set_transfer_mode.
> 4. Move change log to correct place.
>
> Changes in V5:
> In function sdhci_o2_send_tuning, mrq.data should set to NULL for
> cmd.data has been set to NULL.
>
> Changes in V4:
> Patch V3 delete register SDHCI_TRANSFER_MODE write operation before
> send hardware tuning command in function sdhci_o2_send_tuning. This
> is a mistake. The write operation is essential for tuning command.
> Add it back.
>
> Changes in V3:
> Rebase the patch on the mmc tree 'next' branch.
>
> Changes in V2:
> Modify code format, and delete unused code path.
>
> Changes in V1:
> Add many functions to execute hardware tuning for eMMC 1.8V HS200
> mode, the hardware tuning procedure is based on O2/Bayhub hardware
> tuning spec.
> ---
> drivers/mmc/host/sdhci-pci-o2micro.c | 81 ++++++++++++++++++++++++++++
> drivers/mmc/host/sdhci.c | 4 +-
> 2 files changed, 84 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/sdhci-pci-o2micro.c b/drivers/mmc/host/sdhci-pci-o2micro.c
> index 94cf3cd75dd3..7747e8ba2e3d 100644
> --- a/drivers/mmc/host/sdhci-pci-o2micro.c
> +++ b/drivers/mmc/host/sdhci-pci-o2micro.c
> @@ -17,6 +17,9 @@
> */
>
> #include <linux/pci.h>
> +#include <linux/mmc/host.h>
> +#include <linux/mmc/mmc.h>
> +#include <linux/delay.h>
>
> #include "sdhci.h"
> #include "sdhci-pci.h"
> @@ -55,6 +58,82 @@
>
> #define O2_SD_VENDOR_SETTING 0x110
> #define O2_SD_VENDOR_SETTING2 0x1C8
> +#define O2_SD_HW_TUNING_DISABLE BIT(4)
> +
> +static void sdhci_o2_set_tuning_mode(struct sdhci_host *host)
> +{
> + u16 reg;
> +
> + /* enable hardware tuning */
> + reg = sdhci_readw(host, O2_SD_VENDOR_SETTING);
> + reg &= ~O2_SD_HW_TUNING_DISABLE;
> + sdhci_writew(host, reg, O2_SD_VENDOR_SETTING);
> +}
> +
> +static void __sdhci_o2_execute_tuning(struct sdhci_host *host, u32 opcode)
> +{
> + int i;
> +
> + sdhci_send_tuning(host, MMC_SEND_TUNING_BLOCK_HS200);
> +
> + for (i = 0; i < 150; i++) {
> + u16 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
> +
> + if (!(ctrl & SDHCI_CTRL_EXEC_TUNING)) {
> + if (ctrl & SDHCI_CTRL_TUNED_CLK) {
> + host->tuning_done = true;
> + return;
> + }
> + pr_warn("%s: HW tuning failed !\n",
> + mmc_hostname(host->mmc));
> + break;
> + }
> +
> + mdelay(1);
> + }
> +
> + pr_info("%s: Tuning failed, falling back to fixed sampling clock\n",
> + mmc_hostname(host->mmc));
> + sdhci_reset_tuning(host);
> +}
> +
> +static int sdhci_o2_execute_tuning(struct mmc_host *mmc, u32 opcode)
> +{
> + struct sdhci_host *host = mmc_priv(mmc);
> + int current_bus_width = 0;
> +
> + /*
> + * This handler only implements the eMMC tuning that is specific to
> + * this controller. Fall back to the standard method for other TIMING.
> + */
> + if (host->timing != MMC_TIMING_MMC_HS200)
> + return sdhci_execute_tuning(mmc, opcode);
> +
> + if (WARN_ON(opcode != MMC_SEND_TUNING_BLOCK_HS200))
> + return -EINVAL;
> +
> + /*
> + * o2 sdhci host didn't support 8bit emmc tuning
> + */
> + if (mmc->ios.bus_width == MMC_BUS_WIDTH_8) {
> + current_bus_width = mmc->ios.bus_width;
> + sdhci_set_bus_width(host, MMC_BUS_WIDTH_4);
> + }
> +
> + sdhci_o2_set_tuning_mode(host);
> +
> + sdhci_start_tuning(host);
> +
> + __sdhci_o2_execute_tuning(host, opcode);
> +
> + sdhci_end_tuning(host);
> +
> + if (current_bus_width == MMC_BUS_WIDTH_8)
> + sdhci_set_bus_width(host, current_bus_width);
> +
> + host->flags &= ~SDHCI_HS400_TUNING;
> + return 0;
> +}
>
> static void o2_pci_set_baseclk(struct sdhci_pci_chip *chip, u32 value)
> {
> @@ -215,6 +294,8 @@ int sdhci_pci_o2_probe_slot(struct sdhci_pci_slot *slot)
> }
> }
>
> + host->mmc_host_ops.execute_tuning = sdhci_o2_execute_tuning;
> +
> if (chip->pdev->device != PCI_DEVICE_ID_O2_FUJIN2)
> break;
> /* set dll watch dog timer */
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index bcea179a8d70..1b3fbd9bd5c5 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -1029,7 +1029,9 @@ static void sdhci_set_transfer_mode(struct sdhci_host *host,
> if (data == NULL) {
> if (host->quirks2 &
> SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD) {
> - sdhci_writew(host, 0x0, SDHCI_TRANSFER_MODE);
> + /* must not clear SDHCI_TRANSFER_MODE when tuning */
> + if (cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200)
> + sdhci_writew(host, 0x0, SDHCI_TRANSFER_MODE);
> } else {
> /* clear Auto CMD settings for no data CMDs */
> mode = sdhci_readw(host, SDHCI_TRANSFER_MODE);
>
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