mmc: sdhci-of-esdhc: Don't walk device-tree on every interrupt

Commit b214fe592ab7 ("mmc: sdhci-of-esdhc: add erratum eSDHC7 support")
added code to check for a specific compatible string in the device-tree
on every esdhc interrupat. Instead of doing this record the quirk in
struct sdhci_esdhc and lookup the struct in esdhc_irq.

Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Link: https://lore.kernel.org/r/20200903012029.25673-1-chris.packham@alliedtelesis.co.nz
Fixes: b214fe592ab7 ("mmc: sdhci-of-esdhc: add erratum eSDHC7 support")
Cc: stable@vger.kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
index 7c73d24..45881b3 100644 (file)
--- a/drivers/mmc/host/sdhci-of-esdhc.c
+++ b/drivers/mmc/host/sdhci-of-esdhc.c
@@ -81,6 +81,7 @@ struct sdhci_esdhc {
        bool quirk_tuning_erratum_type2;
        bool quirk_ignore_data_inhibit;
        bool quirk_delay_before_data_reset;
+       bool quirk_trans_complete_erratum;
        bool in_sw_tuning;
        unsigned int peripheral_clock;
        const struct esdhc_clk_fixup *clk_fixup;
@@ -1177,10 +1178,11 @@ static void esdhc_set_uhs_signaling(struct sdhci_host *host,
 
 static u32 esdhc_irq(struct sdhci_host *host, u32 intmask)
 {
+       struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+       struct sdhci_esdhc *esdhc = sdhci_pltfm_priv(pltfm_host);
        u32 command;
 
-       if (of_find_compatible_node(NULL, NULL,
-                               "fsl,p2020-esdhc")) {
+       if (esdhc->quirk_trans_complete_erratum) {
                command = SDHCI_GET_CMD(sdhci_readw(host,
                                        SDHCI_COMMAND));
                if (command == MMC_WRITE_MULTIPLE_BLOCK &&
@@ -1334,8 +1336,10 @@ static void esdhc_init(struct platform_device *pdev, struct sdhci_host *host)
                esdhc->clk_fixup = match->data;
        np = pdev->dev.of_node;
 
-       if (of_device_is_compatible(np, "fsl,p2020-esdhc"))
+       if (of_device_is_compatible(np, "fsl,p2020-esdhc")) {
                esdhc->quirk_delay_before_data_reset = true;
+               esdhc->quirk_trans_complete_erratum = true;
+       }
 
        clk = of_clk_get(np, 0);
        if (!IS_ERR(clk)) {