1. Patchew
  2. linux
  3. [PATCH 0/2] mmc: sdhci-pci-gli: Remove unnecessary device-dependent code
  4. View patch

[PATCH 2/2] mmc: sdhci-pci-gli: Use pci_set_power_state(), not direct PMCSR writes

Bjorn Helgaas posted 2 patches 1 year, 10 months ago
[PATCH 2/2] mmc: sdhci-pci-gli: Use pci_set_power_state(), not direct PMCSR writes
Posted by Bjorn Helgaas 1 year, 10 months ago 
From: Bjorn Helgaas <bhelgaas@google.com>

d7133797e9e1 ("mmc: sdhci-pci-gli: A workaround to allow GL9750 to enter
ASPM L1.2") and 36ed2fd32b2c ("mmc: sdhci-pci-gli: A workaround to allow
GL9755 to enter ASPM L1.2") added writes to the Control register in the
Power Management Capability to put the device in D3hot and back to D0.

Use the pci_set_power_state() interface instead because these are generic
operations that don't need to be driver-specific.  Also, the PCI spec
requires some delays after these power transitions, and
pci_set_power_state() takes care of those, while d7133797e9e1 and
36ed2fd32b2c did not.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
---
 drivers/mmc/host/sdhci-pci-gli.c | 20 ++++----------------
 1 file changed, 4 insertions(+), 16 deletions(-)

diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c
index 3d5543581537..0f81586a19df 100644
--- a/drivers/mmc/host/sdhci-pci-gli.c
+++ b/drivers/mmc/host/sdhci-pci-gli.c
@@ -25,9 +25,6 @@
 #define   GLI_9750_WT_EN_ON	    0x1
 #define   GLI_9750_WT_EN_OFF	    0x0
 
-#define PCI_GLI_9750_PM_CTRL	0xFC
-#define   PCI_GLI_9750_PM_STATE	  GENMASK(1, 0)
-
 #define SDHCI_GLI_9750_CFG2          0x848
 #define   SDHCI_GLI_9750_CFG2_L1DLY    GENMASK(28, 24)
 #define   GLI_9750_CFG2_L1DLY_VALUE    0x1F
@@ -149,9 +146,6 @@
 #define PCI_GLI_9755_MISC	    0x78
 #define   PCI_GLI_9755_MISC_SSC_OFF    BIT(26)
 
-#define PCI_GLI_9755_PM_CTRL     0xFC
-#define   PCI_GLI_9755_PM_STATE    GENMASK(1, 0)
-
 #define SDHCI_GLI_9767_GM_BURST_SIZE			0x510
 #define   SDHCI_GLI_9767_GM_BURST_SIZE_AXI_ALWAYS_SET	  BIT(8)
 
@@ -556,11 +550,8 @@ static void gl9750_hw_setting(struct sdhci_host *host)
 	sdhci_writel(host, value, SDHCI_GLI_9750_CFG2);
 
 	/* toggle PM state to allow GL9750 to enter ASPM L1.2 */
-	pci_read_config_dword(pdev, PCI_GLI_9750_PM_CTRL, &value);
-	value |= PCI_GLI_9750_PM_STATE;
-	pci_write_config_dword(pdev, PCI_GLI_9750_PM_CTRL, value);
-	value &= ~PCI_GLI_9750_PM_STATE;
-	pci_write_config_dword(pdev, PCI_GLI_9750_PM_CTRL, value);
+	pci_set_power_state(pdev, PCI_D3hot);
+	pci_set_power_state(pdev, PCI_D0);
 
 	/* mask the replay timer timeout of AER */
 	aer = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR);
@@ -774,11 +765,8 @@ static void gl9755_hw_setting(struct sdhci_pci_slot *slot)
 	pci_write_config_dword(pdev, PCI_GLI_9755_CFG2, value);
 
 	/* toggle PM state to allow GL9755 to enter ASPM L1.2 */
-	pci_read_config_dword(pdev, PCI_GLI_9755_PM_CTRL, &value);
-	value |= PCI_GLI_9755_PM_STATE;
-	pci_write_config_dword(pdev, PCI_GLI_9755_PM_CTRL, value);
-	value &= ~PCI_GLI_9755_PM_STATE;
-	pci_write_config_dword(pdev, PCI_GLI_9755_PM_CTRL, value);
+	pci_set_power_state(pdev, PCI_D3hot);
+	pci_set_power_state(pdev, PCI_D0);
 
 	/* mask the replay timer timeout of AER */
 	aer = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR);
-- 
2.34.1
Re: [PATCH 2/2] mmc: sdhci-pci-gli: Use pci_set_power_state(), not direct PMCSR writes
Posted by Ben Chuang 1 year, 10 months ago 
On Thu, Mar 28, 2024 at 5:49 AM Bjorn Helgaas <helgaas@kernel.org> wrote:
>
> From: Bjorn Helgaas <bhelgaas@google.com>
>
> d7133797e9e1 ("mmc: sdhci-pci-gli: A workaround to allow GL9750 to enter
> ASPM L1.2") and 36ed2fd32b2c ("mmc: sdhci-pci-gli: A workaround to allow
> GL9755 to enter ASPM L1.2") added writes to the Control register in the
> Power Management Capability to put the device in D3hot and back to D0.
>
> Use the pci_set_power_state() interface instead because these are generic
> operations that don't need to be driver-specific.  Also, the PCI spec
> requires some delays after these power transitions, and
> pci_set_power_state() takes care of those, while d7133797e9e1 and
> 36ed2fd32b2c did not.
>
> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

Hi Bjorn,

Thanks. It looks better than the vendor specific.

Best regards,
Ben Chuang

> ---
>  drivers/mmc/host/sdhci-pci-gli.c | 20 ++++----------------
>  1 file changed, 4 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c
> index 3d5543581537..0f81586a19df 100644
> --- a/drivers/mmc/host/sdhci-pci-gli.c
> +++ b/drivers/mmc/host/sdhci-pci-gli.c
> @@ -25,9 +25,6 @@
>  #define   GLI_9750_WT_EN_ON        0x1
>  #define   GLI_9750_WT_EN_OFF       0x0
>
> -#define PCI_GLI_9750_PM_CTRL   0xFC
> -#define   PCI_GLI_9750_PM_STATE          GENMASK(1, 0)
> -
>  #define SDHCI_GLI_9750_CFG2          0x848
>  #define   SDHCI_GLI_9750_CFG2_L1DLY    GENMASK(28, 24)
>  #define   GLI_9750_CFG2_L1DLY_VALUE    0x1F
> @@ -149,9 +146,6 @@
>  #define PCI_GLI_9755_MISC          0x78
>  #define   PCI_GLI_9755_MISC_SSC_OFF    BIT(26)
>
> -#define PCI_GLI_9755_PM_CTRL     0xFC
> -#define   PCI_GLI_9755_PM_STATE    GENMASK(1, 0)
> -
>  #define SDHCI_GLI_9767_GM_BURST_SIZE                   0x510
>  #define   SDHCI_GLI_9767_GM_BURST_SIZE_AXI_ALWAYS_SET    BIT(8)
>
> @@ -556,11 +550,8 @@ static void gl9750_hw_setting(struct sdhci_host *host)
>         sdhci_writel(host, value, SDHCI_GLI_9750_CFG2);
>
>         /* toggle PM state to allow GL9750 to enter ASPM L1.2 */
> -       pci_read_config_dword(pdev, PCI_GLI_9750_PM_CTRL, &value);
> -       value |= PCI_GLI_9750_PM_STATE;
> -       pci_write_config_dword(pdev, PCI_GLI_9750_PM_CTRL, value);
> -       value &= ~PCI_GLI_9750_PM_STATE;
> -       pci_write_config_dword(pdev, PCI_GLI_9750_PM_CTRL, value);
> +       pci_set_power_state(pdev, PCI_D3hot);
> +       pci_set_power_state(pdev, PCI_D0);
>
>         /* mask the replay timer timeout of AER */
>         aer = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR);
> @@ -774,11 +765,8 @@ static void gl9755_hw_setting(struct sdhci_pci_slot *slot)
>         pci_write_config_dword(pdev, PCI_GLI_9755_CFG2, value);
>
>         /* toggle PM state to allow GL9755 to enter ASPM L1.2 */
> -       pci_read_config_dword(pdev, PCI_GLI_9755_PM_CTRL, &value);
> -       value |= PCI_GLI_9755_PM_STATE;
> -       pci_write_config_dword(pdev, PCI_GLI_9755_PM_CTRL, value);
> -       value &= ~PCI_GLI_9755_PM_STATE;
> -       pci_write_config_dword(pdev, PCI_GLI_9755_PM_CTRL, value);
> +       pci_set_power_state(pdev, PCI_D3hot);
> +       pci_set_power_state(pdev, PCI_D0);
>
>         /* mask the replay timer timeout of AER */
>         aer = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR);
> --
> 2.34.1
>
>
Re: [PATCH 2/2] mmc: sdhci-pci-gli: Use pci_set_power_state(), not direct PMCSR writes
Posted by Ulf Hansson 1 year, 10 months ago 
On Thu, 28 Mar 2024 at 02:01, Ben Chuang <benchuanggli@gmail.com> wrote:
>
> On Thu, Mar 28, 2024 at 5:49 AM Bjorn Helgaas <helgaas@kernel.org> wrote:
> >
> > From: Bjorn Helgaas <bhelgaas@google.com>
> >
> > d7133797e9e1 ("mmc: sdhci-pci-gli: A workaround to allow GL9750 to enter
> > ASPM L1.2") and 36ed2fd32b2c ("mmc: sdhci-pci-gli: A workaround to allow
> > GL9755 to enter ASPM L1.2") added writes to the Control register in the
> > Power Management Capability to put the device in D3hot and back to D0.
> >
> > Use the pci_set_power_state() interface instead because these are generic
> > operations that don't need to be driver-specific.  Also, the PCI spec
> > requires some delays after these power transitions, and
> > pci_set_power_state() takes care of those, while d7133797e9e1 and
> > 36ed2fd32b2c did not.
> >
> > Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
>
> Hi Bjorn,
>
> Thanks. It looks better than the vendor specific.
>
> Best regards,
> Ben Chuang

Hi Ben,

I assume I can consider your reply as a reviewed-by tag. If not,
please let me know.

Kind regards
Uffe


>
> > ---
> >  drivers/mmc/host/sdhci-pci-gli.c | 20 ++++----------------
> >  1 file changed, 4 insertions(+), 16 deletions(-)
> >
> > diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c
> > index 3d5543581537..0f81586a19df 100644
> > --- a/drivers/mmc/host/sdhci-pci-gli.c
> > +++ b/drivers/mmc/host/sdhci-pci-gli.c
> > @@ -25,9 +25,6 @@
> >  #define   GLI_9750_WT_EN_ON        0x1
> >  #define   GLI_9750_WT_EN_OFF       0x0
> >
> > -#define PCI_GLI_9750_PM_CTRL   0xFC
> > -#define   PCI_GLI_9750_PM_STATE          GENMASK(1, 0)
> > -
> >  #define SDHCI_GLI_9750_CFG2          0x848
> >  #define   SDHCI_GLI_9750_CFG2_L1DLY    GENMASK(28, 24)
> >  #define   GLI_9750_CFG2_L1DLY_VALUE    0x1F
> > @@ -149,9 +146,6 @@
> >  #define PCI_GLI_9755_MISC          0x78
> >  #define   PCI_GLI_9755_MISC_SSC_OFF    BIT(26)
> >
> > -#define PCI_GLI_9755_PM_CTRL     0xFC
> > -#define   PCI_GLI_9755_PM_STATE    GENMASK(1, 0)
> > -
> >  #define SDHCI_GLI_9767_GM_BURST_SIZE                   0x510
> >  #define   SDHCI_GLI_9767_GM_BURST_SIZE_AXI_ALWAYS_SET    BIT(8)
> >
> > @@ -556,11 +550,8 @@ static void gl9750_hw_setting(struct sdhci_host *host)
> >         sdhci_writel(host, value, SDHCI_GLI_9750_CFG2);
> >
> >         /* toggle PM state to allow GL9750 to enter ASPM L1.2 */
> > -       pci_read_config_dword(pdev, PCI_GLI_9750_PM_CTRL, &value);
> > -       value |= PCI_GLI_9750_PM_STATE;
> > -       pci_write_config_dword(pdev, PCI_GLI_9750_PM_CTRL, value);
> > -       value &= ~PCI_GLI_9750_PM_STATE;
> > -       pci_write_config_dword(pdev, PCI_GLI_9750_PM_CTRL, value);
> > +       pci_set_power_state(pdev, PCI_D3hot);
> > +       pci_set_power_state(pdev, PCI_D0);
> >
> >         /* mask the replay timer timeout of AER */
> >         aer = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR);
> > @@ -774,11 +765,8 @@ static void gl9755_hw_setting(struct sdhci_pci_slot *slot)
> >         pci_write_config_dword(pdev, PCI_GLI_9755_CFG2, value);
> >
> >         /* toggle PM state to allow GL9755 to enter ASPM L1.2 */
> > -       pci_read_config_dword(pdev, PCI_GLI_9755_PM_CTRL, &value);
> > -       value |= PCI_GLI_9755_PM_STATE;
> > -       pci_write_config_dword(pdev, PCI_GLI_9755_PM_CTRL, value);
> > -       value &= ~PCI_GLI_9755_PM_STATE;
> > -       pci_write_config_dword(pdev, PCI_GLI_9755_PM_CTRL, value);
> > +       pci_set_power_state(pdev, PCI_D3hot);
> > +       pci_set_power_state(pdev, PCI_D0);
> >
> >         /* mask the replay timer timeout of AER */
> >         aer = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR);
> > --
> > 2.34.1
> >
> >

Patchew 2.1-devel-b67e4c2

© 2016 - 2026 Red Hat, Inc.