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SubjectRe: [PATCH] mmc: tegra: Optimize write_w path for tegra114 and later
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On 11 February 2015 at 18:55, Rhyland Klein <rklein@nvidia.com> wrote:
> Setup a different set of sdhci_ops for tegra114 and later so that
> the write_w callback is only used on tegra114. This allows us to
> remove the NVQUIRK_SHADOW_XFER_MODE_REG and simply the logic
> in tegra_sdhci_writew.
>
> This was suggested by Alexandre Courbot.
>
> Signed-off-by: Rhyland Klein <rklein@nvidia.com>

Applied, with some changes, thanks!

1. Added the suggested-by tag.
2. Remove some unused variables causing compiler warnings.

Kind regards
Uffe


> ---
> drivers/mmc/host/sdhci-tegra.c | 45 +++++++++++++++++++++++-----------------
> 1 file changed, 26 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
> index f3778d58d1cd..180062498c35 100644
> --- a/drivers/mmc/host/sdhci-tegra.c
> +++ b/drivers/mmc/host/sdhci-tegra.c
> @@ -41,7 +41,6 @@
> #define NVQUIRK_DISABLE_SDR50 BIT(3)
> #define NVQUIRK_DISABLE_SDR104 BIT(4)
> #define NVQUIRK_DISABLE_DDR50 BIT(5)
> -#define NVQUIRK_SHADOW_XFER_MODE_REG BIT(6)
>
> struct sdhci_tegra_soc_data {
> const struct sdhci_pltfm_data *pdata;
> @@ -74,20 +73,18 @@ static void tegra_sdhci_writew(struct sdhci_host *host, u16 val, int reg)
> struct sdhci_tegra *tegra_host = pltfm_host->priv;
> const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data;
>
> - if (soc_data->nvquirks & NVQUIRK_SHADOW_XFER_MODE_REG) {
> - switch (reg) {
> - case SDHCI_TRANSFER_MODE:
> - /*
> - * Postpone this write, we must do it together with a
> - * command write that is down below.
> - */
> - pltfm_host->xfer_mode_shadow = val;
> - return;
> - case SDHCI_COMMAND:
> - writel((val << 16) | pltfm_host->xfer_mode_shadow,
> - host->ioaddr + SDHCI_TRANSFER_MODE);
> - return;
> - }
> + switch (reg) {
> + case SDHCI_TRANSFER_MODE:
> + /*
> + * Postpone this write, we must do it together with a
> + * command write that is down below.
> + */
> + pltfm_host->xfer_mode_shadow = val;
> + return;
> + case SDHCI_COMMAND:
> + writel((val << 16) | pltfm_host->xfer_mode_shadow,
> + host->ioaddr + SDHCI_TRANSFER_MODE);
> + return;
> }
>
> writew(val, host->ioaddr + reg);
> @@ -173,7 +170,6 @@ static void tegra_sdhci_set_bus_width(struct sdhci_host *host, int bus_width)
> static const struct sdhci_ops tegra_sdhci_ops = {
> .get_ro = tegra_sdhci_get_ro,
> .read_w = tegra_sdhci_readw,
> - .write_w = tegra_sdhci_writew,
> .write_l = tegra_sdhci_writel,
> .set_clock = sdhci_set_clock,
> .set_bus_width = tegra_sdhci_set_bus_width,
> @@ -214,6 +210,18 @@ static struct sdhci_tegra_soc_data soc_data_tegra30 = {
> NVQUIRK_DISABLE_SDR104,
> };
>
> +static const struct sdhci_ops tegra114_sdhci_ops = {
> + .get_ro = tegra_sdhci_get_ro,
> + .read_w = tegra_sdhci_readw,
> + .write_w = tegra_sdhci_writew,
> + .write_l = tegra_sdhci_writel,
> + .set_clock = sdhci_set_clock,
> + .set_bus_width = tegra_sdhci_set_bus_width,
> + .reset = tegra_sdhci_reset,
> + .set_uhs_signaling = sdhci_set_uhs_signaling,
> + .get_max_clock = sdhci_pltfm_clk_get_max_clock,
> +};
> +
> static const struct sdhci_pltfm_data sdhci_tegra114_pdata = {
> .quirks = SDHCI_QUIRK_BROKEN_TIMEOUT_VAL |
> SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK |
> @@ -221,15 +229,14 @@ static const struct sdhci_pltfm_data sdhci_tegra114_pdata = {
> SDHCI_QUIRK_NO_HISPD_BIT |
> SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC |
> SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
> - .ops = &tegra_sdhci_ops,
> + .ops = &tegra114_sdhci_ops,
> };
>
> static struct sdhci_tegra_soc_data soc_data_tegra114 = {
> .pdata = &sdhci_tegra114_pdata,
> .nvquirks = NVQUIRK_DISABLE_SDR50 |
> NVQUIRK_DISABLE_DDR50 |
> - NVQUIRK_DISABLE_SDR104 |
> - NVQUIRK_SHADOW_XFER_MODE_REG,
> + NVQUIRK_DISABLE_SDR104,
> };
>
> static const struct of_device_id sdhci_tegra_dt_match[] = {
> --
> 1.7.9.5
>


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