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Subject[PATCH] mmc: tegra: Optimize write_w path for tegra114 and later
Date
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>
---
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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