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Date: Tue, 8 Sep 2020 17:19:37 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: ricky_wu@...ltek.com
Cc: arnd@...db.de, gregkh@...uxfoundation.org, bhelgaas@...gle.com,
ulf.hansson@...aro.org, rui_feng@...lsil.com.cn,
linux-kernel@...r.kernel.org, puranjay12@...il.com,
linux-pci@...r.kernel.org, vailbhavgupta40@...ail.com
Subject: Re: [PATCH v5 1/2] misc: rtsx: Fix power down flow
On Mon, Sep 07, 2020 at 06:07:18PM +0800, ricky_wu@...ltek.com wrote:
> From: Ricky Wu <ricky_wu@...ltek.com>
>
> Fix and sort out rtsx driver power down flow
It would be nice to say what's changing here, but it's a great
improvement to have this split out.
For example, this drops the "pm_state == HOST_ENTER_S3" check, but
there's no explanation.
Minor comments below.
> Signed-off-by: Ricky Wu <ricky_wu@...ltek.com>
> ---
> drivers/misc/cardreader/rts5227.c | 15 ---------------
> drivers/misc/cardreader/rts5228.c | 5 ++---
> drivers/misc/cardreader/rts5249.c | 17 -----------------
> drivers/misc/cardreader/rts5260.c | 16 ----------------
> drivers/misc/cardreader/rtsx_pcr.c | 16 ++++++++++++++++
> 5 files changed, 18 insertions(+), 51 deletions(-)
>
> diff --git a/drivers/misc/cardreader/rts5227.c b/drivers/misc/cardreader/rts5227.c
> index f5f392ddf3d6..747391e3fb5d 100644
> --- a/drivers/misc/cardreader/rts5227.c
> +++ b/drivers/misc/cardreader/rts5227.c
> @@ -77,19 +77,6 @@ static void rts5227_fetch_vendor_settings(struct rtsx_pcr *pcr)
> pcr->flags |= PCR_REVERSE_SOCKET;
> }
>
> -static void rts5227_force_power_down(struct rtsx_pcr *pcr, u8 pm_state)
> -{
> - /* Set relink_time to 0 */
> - rtsx_pci_write_register(pcr, AUTOLOAD_CFG_BASE + 1, 0xFF, 0);
> - rtsx_pci_write_register(pcr, AUTOLOAD_CFG_BASE + 2, 0xFF, 0);
> - rtsx_pci_write_register(pcr, AUTOLOAD_CFG_BASE + 3, 0x01, 0);
> -
> - if (pm_state == HOST_ENTER_S3)
> - rtsx_pci_write_register(pcr, pcr->reg_pm_ctrl3, 0x10, 0x10);
> -
> - rtsx_pci_write_register(pcr, FPDCTL, 0x03, 0x03);
> -}
> -
> static int rts5227_extra_init_hw(struct rtsx_pcr *pcr)
> {
> u16 cap;
> @@ -239,7 +226,6 @@ static const struct pcr_ops rts5227_pcr_ops = {
> .switch_output_voltage = rts5227_switch_output_voltage,
> .cd_deglitch = NULL,
> .conv_clk_and_div_n = NULL,
> - .force_power_down = rts5227_force_power_down,
> };
>
> /* SD Pull Control Enable:
> @@ -389,7 +375,6 @@ static const struct pcr_ops rts522a_pcr_ops = {
> .switch_output_voltage = rts522a_switch_output_voltage,
> .cd_deglitch = NULL,
> .conv_clk_and_div_n = NULL,
> - .force_power_down = rts5227_force_power_down,
> };
>
> void rts522a_init_params(struct rtsx_pcr *pcr)
> diff --git a/drivers/misc/cardreader/rts5228.c b/drivers/misc/cardreader/rts5228.c
> index 28feab1449ab..781a86def59a 100644
> --- a/drivers/misc/cardreader/rts5228.c
> +++ b/drivers/misc/cardreader/rts5228.c
> @@ -99,9 +99,8 @@ static void rts5228_force_power_down(struct rtsx_pcr *pcr, u8 pm_state)
> rtsx_pci_write_register(pcr, AUTOLOAD_CFG_BASE + 3,
> RELINK_TIME_MASK, 0);
>
> - if (pm_state == HOST_ENTER_S3)
> - rtsx_pci_write_register(pcr, pcr->reg_pm_ctrl3,
> - D3_DELINK_MODE_EN, D3_DELINK_MODE_EN);
> + rtsx_pci_write_register(pcr, pcr->reg_pm_ctrl3,
> + D3_DELINK_MODE_EN, D3_DELINK_MODE_EN);
>
> rtsx_pci_write_register(pcr, FPDCTL,
> SSC_POWER_DOWN, SSC_POWER_DOWN);
> diff --git a/drivers/misc/cardreader/rts5249.c b/drivers/misc/cardreader/rts5249.c
> index 941b3d77f1e9..719aa2d61919 100644
> --- a/drivers/misc/cardreader/rts5249.c
> +++ b/drivers/misc/cardreader/rts5249.c
> @@ -78,20 +78,6 @@ static void rtsx_base_fetch_vendor_settings(struct rtsx_pcr *pcr)
> pcr->flags |= PCR_REVERSE_SOCKET;
> }
>
> -static void rtsx_base_force_power_down(struct rtsx_pcr *pcr, u8 pm_state)
> -{
> - /* Set relink_time to 0 */
> - rtsx_pci_write_register(pcr, AUTOLOAD_CFG_BASE + 1, 0xFF, 0);
> - rtsx_pci_write_register(pcr, AUTOLOAD_CFG_BASE + 2, 0xFF, 0);
> - rtsx_pci_write_register(pcr, AUTOLOAD_CFG_BASE + 3, 0x01, 0);
> -
> - if (pm_state == HOST_ENTER_S3)
> - rtsx_pci_write_register(pcr, pcr->reg_pm_ctrl3,
> - D3_DELINK_MODE_EN, D3_DELINK_MODE_EN);
> -
> - rtsx_pci_write_register(pcr, FPDCTL, 0x03, 0x03);
> -}
> -
> static void rts5249_init_from_cfg(struct rtsx_pcr *pcr)
> {
> struct pci_dev *pdev = pcr->pci;
> @@ -360,7 +346,6 @@ static const struct pcr_ops rts5249_pcr_ops = {
> .card_power_on = rtsx_base_card_power_on,
> .card_power_off = rtsx_base_card_power_off,
> .switch_output_voltage = rtsx_base_switch_output_voltage,
> - .force_power_down = rtsx_base_force_power_down,
> };
>
> /* SD Pull Control Enable:
> @@ -585,7 +570,6 @@ static const struct pcr_ops rts524a_pcr_ops = {
> .card_power_on = rtsx_base_card_power_on,
> .card_power_off = rtsx_base_card_power_off,
> .switch_output_voltage = rtsx_base_switch_output_voltage,
> - .force_power_down = rtsx_base_force_power_down,
> .set_l1off_cfg_sub_d0 = rts5250_set_l1off_cfg_sub_d0,
> };
>
> @@ -700,7 +684,6 @@ static const struct pcr_ops rts525a_pcr_ops = {
> .card_power_on = rts525a_card_power_on,
> .card_power_off = rtsx_base_card_power_off,
> .switch_output_voltage = rts525a_switch_output_voltage,
> - .force_power_down = rtsx_base_force_power_down,
> .set_l1off_cfg_sub_d0 = rts5250_set_l1off_cfg_sub_d0,
> };
>
> diff --git a/drivers/misc/cardreader/rts5260.c b/drivers/misc/cardreader/rts5260.c
> index b9f66b1384a6..897cfee350e7 100644
> --- a/drivers/misc/cardreader/rts5260.c
> +++ b/drivers/misc/cardreader/rts5260.c
> @@ -87,21 +87,6 @@ static void rtsx_base_fetch_vendor_settings(struct rtsx_pcr *pcr)
> pcr->flags |= PCR_REVERSE_SOCKET;
> }
>
> -static void rtsx_base_force_power_down(struct rtsx_pcr *pcr, u8 pm_state)
> -{
> - /* Set relink_time to 0 */
> - rtsx_pci_write_register(pcr, AUTOLOAD_CFG_BASE + 1, MASK_8_BIT_DEF, 0);
> - rtsx_pci_write_register(pcr, AUTOLOAD_CFG_BASE + 2, MASK_8_BIT_DEF, 0);
> - rtsx_pci_write_register(pcr, AUTOLOAD_CFG_BASE + 3,
> - RELINK_TIME_MASK, 0);
> -
> - if (pm_state == HOST_ENTER_S3)
> - rtsx_pci_write_register(pcr, pcr->reg_pm_ctrl3,
> - D3_DELINK_MODE_EN, D3_DELINK_MODE_EN);
> -
> - rtsx_pci_write_register(pcr, FPDCTL, ALL_POWER_DOWN, ALL_POWER_DOWN);
> -}
> -
> static int rtsx_base_enable_auto_blink(struct rtsx_pcr *pcr)
> {
> return rtsx_pci_write_register(pcr, OLT_LED_CTL,
> @@ -620,7 +605,6 @@ static const struct pcr_ops rts5260_pcr_ops = {
> .card_power_on = rts5260_card_power_on,
> .card_power_off = rts5260_card_power_off,
> .switch_output_voltage = rts5260_switch_output_voltage,
> - .force_power_down = rtsx_base_force_power_down,
> .stop_cmd = rts5260_stop_cmd,
> .set_l1off_cfg_sub_d0 = rts5260_set_l1off_cfg_sub_d0,
> .enable_ocp = rts5260_enable_ocp,
> diff --git a/drivers/misc/cardreader/rtsx_pcr.c b/drivers/misc/cardreader/rtsx_pcr.c
> index 37ccc67f4914..3f84b898bd9c 100644
> --- a/drivers/misc/cardreader/rtsx_pcr.c
> +++ b/drivers/misc/cardreader/rtsx_pcr.c
> @@ -1096,6 +1096,20 @@ static void rtsx_pci_idle_work(struct work_struct *work)
> mutex_unlock(&pcr->pcr_mutex);
> }
>
> +static void rtsx_base_force_power_down(struct rtsx_pcr *pcr, u8 pm_state)
> +{
> + /* Set relink_time to 0 */
> + rtsx_pci_write_register(pcr, AUTOLOAD_CFG_BASE + 1, MASK_8_BIT_DEF, 0);
> + rtsx_pci_write_register(pcr, AUTOLOAD_CFG_BASE + 2, MASK_8_BIT_DEF, 0);
Personally, I don't think MASK_8_BIT_DEF is an improvement over 0xFF.
> + rtsx_pci_write_register(pcr, AUTOLOAD_CFG_BASE + 3,
> + RELINK_TIME_MASK, 0);
> +
> + rtsx_pci_write_register(pcr, pcr->reg_pm_ctrl3,
> + D3_DELINK_MODE_EN, D3_DELINK_MODE_EN);
> +
> + rtsx_pci_write_register(pcr, FPDCTL, ALL_POWER_DOWN, ALL_POWER_DOWN);
This changes the value written from 0x3 to 0x7 (ALL_POWER_DOWN) in a
couple cases. I guess you know that's OK.
> +}
> +
> static void __maybe_unused rtsx_pci_power_off(struct rtsx_pcr *pcr, u8 pm_state)
> {
> if (pcr->ops->turn_off_led)
> @@ -1109,6 +1123,8 @@ static void __maybe_unused rtsx_pci_power_off(struct rtsx_pcr *pcr, u8 pm_state)
>
> if (pcr->ops->force_power_down)
> pcr->ops->force_power_down(pcr, pm_state);
> + else
> + rtsx_base_force_power_down(pcr, pm_state);
> }
>
> void rtsx_pci_enable_ocp(struct rtsx_pcr *pcr)
> --
> 2.17.1
>
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