CQHCI_SSC1 indicates to CQE the polling period to use when using
periodic SEND_QUEUE_STATUS(CMD13) polling.
The default value is 0x1000, now change it to 0x40, which can
improve the performance of some eMMC devices.
Signed-off-by: Wenbin Mei <[email protected]>
---
drivers/mmc/host/mtk-sd.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index edade0e54a0c..483353ea3a99 100644
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -2453,6 +2453,7 @@ static void msdc_hs400_enhanced_strobe(struct mmc_host *mmc,
static void msdc_cqe_enable(struct mmc_host *mmc)
{
struct msdc_host *host = mmc_priv(mmc);
+ struct cqhci_host *cq_host = mmc->cqe_private;
/* enable cmdq irq */
writel(MSDC_INT_CMDQ, host->base + MSDC_INTEN);
@@ -2462,6 +2463,8 @@ static void msdc_cqe_enable(struct mmc_host *mmc)
msdc_set_busy_timeout(host, 20 * 1000000000ULL, 0);
/* default read data timeout 1s */
msdc_set_timeout(host, 1000000000ULL, 0);
+
+ cqhci_writel(cq_host, 0x40, CQHCI_SSC1);
}
static void msdc_cqe_disable(struct mmc_host *mmc, bool recovery)
--
2.25.1
On Wed, 19 Apr 2023 at 08:30, Wenbin Mei <[email protected]> wrote:
>
> CQHCI_SSC1 indicates to CQE the polling period to use when using
> periodic SEND_QUEUE_STATUS(CMD13) polling.
> The default value is 0x1000, now change it to 0x40, which can
> improve the performance of some eMMC devices.
Rather than just providing hexadecimal numbers, would you mind
explaining a bit what it translates into?
For example, "the default value 0x1000 that corresponds to x ms...,
... lets' decrease it to 0x40 that corresponds to x ms".
Moreover, it would be nice to have a comment in the code too,
explaining what 0x40 translates into.
Other than this, this looks good to me.
Kind regards
Uffe
>
> Signed-off-by: Wenbin Mei <[email protected]>
> ---
> drivers/mmc/host/mtk-sd.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
> index edade0e54a0c..483353ea3a99 100644
> --- a/drivers/mmc/host/mtk-sd.c
> +++ b/drivers/mmc/host/mtk-sd.c
> @@ -2453,6 +2453,7 @@ static void msdc_hs400_enhanced_strobe(struct mmc_host *mmc,
> static void msdc_cqe_enable(struct mmc_host *mmc)
> {
> struct msdc_host *host = mmc_priv(mmc);
> + struct cqhci_host *cq_host = mmc->cqe_private;
>
> /* enable cmdq irq */
> writel(MSDC_INT_CMDQ, host->base + MSDC_INTEN);
> @@ -2462,6 +2463,8 @@ static void msdc_cqe_enable(struct mmc_host *mmc)
> msdc_set_busy_timeout(host, 20 * 1000000000ULL, 0);
> /* default read data timeout 1s */
> msdc_set_timeout(host, 1000000000ULL, 0);
> +
> + cqhci_writel(cq_host, 0x40, CQHCI_SSC1);
> }
>
> static void msdc_cqe_disable(struct mmc_host *mmc, bool recovery)
> --
> 2.25.1
>
On Tue, 2023-05-09 at 11:29 +0200, Ulf Hansson wrote:
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
>
>
> On Wed, 19 Apr 2023 at 08:30, Wenbin Mei <[email protected]>
> wrote:
> >
> > CQHCI_SSC1 indicates to CQE the polling period to use when using
> > periodic SEND_QUEUE_STATUS(CMD13) polling.
> > The default value is 0x1000, now change it to 0x40, which can
> > improve the performance of some eMMC devices.
>
> Rather than just providing hexadecimal numbers, would you mind
> explaining a bit what it translates into?
>
> For example, "the default value 0x1000 that corresponds to x ms...,
> ... lets' decrease it to 0x40 that corresponds to x ms".
>
> Moreover, it would be nice to have a comment in the code too,
> explaining what 0x40 translates into.
>
> Other than this, this looks good to me.
>
> Kind regards
> Uffe
>
Thanks for your review.
I will follow your comment in next change.
> >
> > Signed-off-by: Wenbin Mei <[email protected]>
> > ---
> > drivers/mmc/host/mtk-sd.c | 3 +++
> > 1 file changed, 3 insertions(+)
> >
> > diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
> > index edade0e54a0c..483353ea3a99 100644
> > --- a/drivers/mmc/host/mtk-sd.c
> > +++ b/drivers/mmc/host/mtk-sd.c
> > @@ -2453,6 +2453,7 @@ static void msdc_hs400_enhanced_strobe(struct
> > mmc_host *mmc,
> > static void msdc_cqe_enable(struct mmc_host *mmc)
> > {
> > struct msdc_host *host = mmc_priv(mmc);
> > + struct cqhci_host *cq_host = mmc->cqe_private;
> >
> > /* enable cmdq irq */
> > writel(MSDC_INT_CMDQ, host->base + MSDC_INTEN);
> > @@ -2462,6 +2463,8 @@ static void msdc_cqe_enable(struct mmc_host
> > *mmc)
> > msdc_set_busy_timeout(host, 20 * 1000000000ULL, 0);
> > /* default read data timeout 1s */
> > msdc_set_timeout(host, 1000000000ULL, 0);
> > +
> > + cqhci_writel(cq_host, 0x40, CQHCI_SSC1);
> > }
> >
> > static void msdc_cqe_disable(struct mmc_host *mmc, bool recovery)
> > --
> > 2.25.1
> >