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Groups > linux.kernel > #1296667 > unrolled thread
| Started by | Andy Shevchenko <andy.shevchenko@gmail.com> |
|---|---|
| First post | 2015-12-22 11:00 +0100 |
| Last post | 2015-12-23 01:50 +0100 |
| Articles | 2 — 2 participants |
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Re: [PATCH 1/3] mmc: sdhci-pci: Add AMD HS200 mode tuning function Andy Shevchenko <andy.shevchenko@gmail.com> - 2015-12-22 11:00 +0100
Re: [PATCH 1/3] mmc: sdhci-pci: Add AMD HS200 mode tuning function Wan ZongShun <mcuos.com@gmail.com> - 2015-12-23 01:50 +0100
| From | Andy Shevchenko <andy.shevchenko@gmail.com> |
|---|---|
| Date | 2015-12-22 11:00 +0100 |
| Subject | Re: [PATCH 1/3] mmc: sdhci-pci: Add AMD HS200 mode tuning function |
| Message-ID | <qIrTB-2h1-13@gated-at.bofh.it> |
On Tue, Dec 22, 2015 at 6:40 PM, Wan Zongshun <vincent.wan@amd.com> wrote:
> From: Wan Zongshun <Vincent.Wan@amd.com>
>
> This patch is to add software tuning functions for AMD hs200
> mode.
>
> Signed-off-by: Wan Zongshun <Vincent.Wan@amd.com>
> ---
> drivers/mmc/host/sdhci-pci-core.c | 146 ++++++++++++++++++++++++++++++++++++++
> 1 file changed, 146 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c
> index 08f4a9f..01c5723 100644
> --- a/drivers/mmc/host/sdhci-pci-core.c
> +++ b/drivers/mmc/host/sdhci-pci-core.c
> @@ -729,6 +729,152 @@ enum amd_chipset_gen {
> AMD_CHIPSET_UNKNOWN,
> };
>
> +struct tuning_descriptor {
> + unsigned char tune_around;
> + bool this_tune_ok;
> + bool last_tune_ok;
> + bool valid_front_end;
> + unsigned char valid_front;
> + unsigned char valid_window_max;
> + unsigned char tune_low_max;
> + unsigned char tune_low;
> + unsigned char valid_window;
> + unsigned char tune_result;
> +};
> +
> +#define AMD_EMMC_TUNE_REG 0xb8
> +static struct tuning_descriptor tdescriptor;
Global variable?!
> +
> +static int tuning_reset(struct sdhci_host *host)
Better prefixes?
> +{
> + unsigned int val;
> + unsigned long flags;
> +
> + spin_lock_irqsave(&host->lock, flags);
> +
> + val = sdhci_readw(host, SDHCI_HOST_CONTROL2);
> + val |= SDHCI_CTRL_PRESET_VAL_ENABLE | SDHCI_CTRL_EXEC_TUNING;
> + sdhci_writew(host, val, SDHCI_HOST_CONTROL2);
> +
> + val = sdhci_readw(host, SDHCI_HOST_CONTROL2);
> + val &= ~SDHCI_CTRL_EXEC_TUNING;
> + sdhci_writew(host, val, SDHCI_HOST_CONTROL2);
> +
> + spin_unlock_irqrestore(&host->lock, flags);
> +
> + return 0;
> +}
> +
> +static int config_tuning_phase(struct sdhci_host *host, unsigned char phase)
> +{
> + struct sdhci_pci_slot *slot = sdhci_priv(host);
> + struct pci_dev *pdev = slot->chip->pdev;
> + unsigned int val;
> + unsigned long flags;
> +
> + spin_lock_irqsave(&host->lock, flags);
> +
> + pci_read_config_dword(pdev, AMD_EMMC_TUNE_REG, &val);
> + val &= ~0xf;
> + val |= (0x10800 | phase);
Magic.
> + pci_write_config_dword(pdev, AMD_EMMC_TUNE_REG, val);
> +
> + spin_unlock_irqrestore(&host->lock, flags);
> +
> + return 0;
> +}
> +
> +static int find_good_phase(struct sdhci_host *host)
> +{
> + struct tuning_descriptor *td = &tdescriptor;
> + struct sdhci_pci_slot *slot = sdhci_priv(host);
> + struct pci_dev *pdev = slot->chip->pdev;
> + unsigned int val;
> + unsigned long flags;
> +
> + spin_lock_irqsave(&host->lock, flags);
> +
> + if (td->this_tune_ok == false)
> + td->valid_front_end = 1;
> +
> + if (td->valid_front_end)
> + td->valid_front = td->valid_front;
> + else if (td->this_tune_ok)
> + td->valid_front = td->valid_front + 1;
> +
> + if ((!td->this_tune_ok && td->last_tune_ok) ||
> + (td->tune_around == 11)) {
Magic.
> + if (td->valid_window > td->valid_window_max) {
> + td->valid_window_max = td->valid_window;
> + td->tune_low_max = td->tune_low;
> + }
> + }
> +
> + if (td->this_tune_ok) {
> + if (!td->last_tune_ok)
> + td->tune_low = td->tune_around;
> + td->valid_window = td->valid_window + 1;
> + } else {
> + if (td->last_tune_ok)
> + td->valid_window = 0x0;
> + }
> +
> + td->last_tune_ok = td->this_tune_ok;
> +
> + if (td->tune_around == 11) {
> + if ((td->valid_front + td->valid_window) >
> + td->valid_window_max) {
> + if (td->valid_front > td->valid_window)
> + td->tune_result =
> + ((td->valid_front - td->valid_window) >> 1);
> + else
> + td->tune_result = td->tune_low +
> + ((td->valid_window + td->valid_front) >> 1);
> + } else {
> + td->tune_result =
> + td->tune_low_max + (td->valid_window_max >> 1);
> + }
> +
> + if (td->tune_result > 0x0b)
> + td->tune_result = 0x0b;
> +
> + pci_read_config_dword(pdev, AMD_EMMC_TUNE_REG, &val);
> + val &= ~0xf;
> + val |= (0x10800 | td->tune_result);
Magic.
> + pci_write_config_dword(pdev, AMD_EMMC_TUNE_REG, val);
> + }
> +
> + spin_unlock_irqrestore(&host->lock, flags);
> +
> + return 0;
> +}
> +
> +static int amd_execute_tuning(struct sdhci_host *host, u32 opcode)
> +{
> + struct tuning_descriptor *td = &tdescriptor;
> +
> + tuning_reset(host);
> +
> + for (td->tune_around = 0; td->tune_around < 12; td->tune_around++) {
Magic.
Why loop is done with non-local variable?
> +
> + config_tuning_phase(host, td->tune_around);
> +
> + if (mmc_send_tuning(host->mmc, opcode, NULL)) {
> + td->this_tune_ok = false;
> + host->mmc->need_retune = 0;
> + mdelay(4);
> + } else {
> + td->this_tune_ok = true;
> + }
> +
> + find_good_phase(host);
> + }
> +
> + host->mmc->retune_period = 0;
> +
> + return 0;
> +}
> +
> static int amd_probe(struct sdhci_pci_chip *chip)
> {
> struct pci_dev *smbus_dev;
No users for such code. I don't think it makes sense to push it separately.
--
With Best Regards,
Andy Shevchenko
--
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| From | Wan ZongShun <mcuos.com@gmail.com> |
|---|---|
| Date | 2015-12-23 01:50 +0100 |
| Message-ID | <qIFMR-2FA-5@gated-at.bofh.it> |
| In reply to | #1296667 |
2015-12-22 17:52 GMT+08:00 Andy Shevchenko <andy.shevchenko@gmail.com>:
> On Tue, Dec 22, 2015 at 6:40 PM, Wan Zongshun <vincent.wan@amd.com> wrote:
>> From: Wan Zongshun <Vincent.Wan@amd.com>
>>
>> This patch is to add software tuning functions for AMD hs200
>> mode.
>>
>> Signed-off-by: Wan Zongshun <Vincent.Wan@amd.com>
>> ---
>> drivers/mmc/host/sdhci-pci-core.c | 146 ++++++++++++++++++++++++++++++++++++++
>> 1 file changed, 146 insertions(+)
>>
>> diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c
>> index 08f4a9f..01c5723 100644
>> --- a/drivers/mmc/host/sdhci-pci-core.c
>> +++ b/drivers/mmc/host/sdhci-pci-core.c
>> @@ -729,6 +729,152 @@ enum amd_chipset_gen {
>> AMD_CHIPSET_UNKNOWN,
>> };
>>
>> +struct tuning_descriptor {
>> + unsigned char tune_around;
>> + bool this_tune_ok;
>> + bool last_tune_ok;
>> + bool valid_front_end;
>> + unsigned char valid_front;
>> + unsigned char valid_window_max;
>> + unsigned char tune_low_max;
>> + unsigned char tune_low;
>> + unsigned char valid_window;
>> + unsigned char tune_result;
>> +};
>> +
>> +#define AMD_EMMC_TUNE_REG 0xb8
>> +static struct tuning_descriptor tdescriptor;
>
> Global variable?!
Okay, will change it to local.
>
>> +
>> +static int tuning_reset(struct sdhci_host *host)
>
> Better prefixes?
Do you mean I should not name this function to tuning reset?
>
>> +{
>> + unsigned int val;
>> + unsigned long flags;
>> +
>> + spin_lock_irqsave(&host->lock, flags);
>> +
>> + val = sdhci_readw(host, SDHCI_HOST_CONTROL2);
>> + val |= SDHCI_CTRL_PRESET_VAL_ENABLE | SDHCI_CTRL_EXEC_TUNING;
>> + sdhci_writew(host, val, SDHCI_HOST_CONTROL2);
>> +
>> + val = sdhci_readw(host, SDHCI_HOST_CONTROL2);
>> + val &= ~SDHCI_CTRL_EXEC_TUNING;
>> + sdhci_writew(host, val, SDHCI_HOST_CONTROL2);
>> +
>> + spin_unlock_irqrestore(&host->lock, flags);
>> +
>> + return 0;
>> +}
>> +
>> +static int config_tuning_phase(struct sdhci_host *host, unsigned char phase)
>> +{
>> + struct sdhci_pci_slot *slot = sdhci_priv(host);
>> + struct pci_dev *pdev = slot->chip->pdev;
>> + unsigned int val;
>> + unsigned long flags;
>> +
>> + spin_lock_irqsave(&host->lock, flags);
>> +
>> + pci_read_config_dword(pdev, AMD_EMMC_TUNE_REG, &val);
>> + val &= ~0xf;
>> + val |= (0x10800 | phase);
>
> Magic.
Okay, I will make 0x10800 to be see more clearly, will define each bit
Macro for it.
>
>> + pci_write_config_dword(pdev, AMD_EMMC_TUNE_REG, val);
>> +
>> + spin_unlock_irqrestore(&host->lock, flags);
>> +
>> + return 0;
>> +}
>> +
>> +static int find_good_phase(struct sdhci_host *host)
>> +{
>> + struct tuning_descriptor *td = &tdescriptor;
>> + struct sdhci_pci_slot *slot = sdhci_priv(host);
>> + struct pci_dev *pdev = slot->chip->pdev;
>> + unsigned int val;
>> + unsigned long flags;
>> +
>> + spin_lock_irqsave(&host->lock, flags);
>> +
>> + if (td->this_tune_ok == false)
>> + td->valid_front_end = 1;
>> +
>> + if (td->valid_front_end)
>> + td->valid_front = td->valid_front;
>> + else if (td->this_tune_ok)
>> + td->valid_front = td->valid_front + 1;
>> +
>> + if ((!td->this_tune_ok && td->last_tune_ok) ||
>> + (td->tune_around == 11)) {
>
> Magic.
>
>> + if (td->valid_window > td->valid_window_max) {
>> + td->valid_window_max = td->valid_window;
>> + td->tune_low_max = td->tune_low;
>> + }
>> + }
>> +
>> + if (td->this_tune_ok) {
>> + if (!td->last_tune_ok)
>> + td->tune_low = td->tune_around;
>> + td->valid_window = td->valid_window + 1;
>> + } else {
>> + if (td->last_tune_ok)
>> + td->valid_window = 0x0;
>> + }
>> +
>> + td->last_tune_ok = td->this_tune_ok;
>> +
>> + if (td->tune_around == 11) {
>> + if ((td->valid_front + td->valid_window) >
>> + td->valid_window_max) {
>> + if (td->valid_front > td->valid_window)
>> + td->tune_result =
>> + ((td->valid_front - td->valid_window) >> 1);
>> + else
>> + td->tune_result = td->tune_low +
>> + ((td->valid_window + td->valid_front) >> 1);
>> + } else {
>> + td->tune_result =
>> + td->tune_low_max + (td->valid_window_max >> 1);
>> + }
>> +
>> + if (td->tune_result > 0x0b)
>> + td->tune_result = 0x0b;
>> +
>> + pci_read_config_dword(pdev, AMD_EMMC_TUNE_REG, &val);
>> + val &= ~0xf;
>> + val |= (0x10800 | td->tune_result);
>
> Magic.
>
>> + pci_write_config_dword(pdev, AMD_EMMC_TUNE_REG, val);
>> + }
>> +
>> + spin_unlock_irqrestore(&host->lock, flags);
>> +
>> + return 0;
>> +}
>> +
>> +static int amd_execute_tuning(struct sdhci_host *host, u32 opcode)
>> +{
>> + struct tuning_descriptor *td = &tdescriptor;
>> +
>> + tuning_reset(host);
>> +
>> + for (td->tune_around = 0; td->tune_around < 12; td->tune_around++) {
>
> Magic.
>
> Why loop is done with non-local variable?
It will be changed at next version.
thanks!
>
>> +
>> + config_tuning_phase(host, td->tune_around);
>> +
>> + if (mmc_send_tuning(host->mmc, opcode, NULL)) {
>> + td->this_tune_ok = false;
>> + host->mmc->need_retune = 0;
>> + mdelay(4);
>> + } else {
>> + td->this_tune_ok = true;
>> + }
>> +
>> + find_good_phase(host);
>> + }
>> +
>> + host->mmc->retune_period = 0;
>> +
>> + return 0;
>> +}
>> +
>> static int amd_probe(struct sdhci_pci_chip *chip)
>> {
>> struct pci_dev *smbus_dev;
>
> No users for such code. I don't think it makes sense to push it separately.
Since I am not sure the patch 2/3 is ok to every body, so it just is my try.
If we can make decision for patch2/3, I can integrate them into one
patch per your suggestion.
Thanks Andy.
>
> --
> With Best Regards,
> Andy Shevchenko
--
---
Vincent Wan(Zongshun)
www.mcuos.com
--
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