mmc: wmt-sdmmc: Simplify wmt_set_sd_power implementation

Simplify the code to set/clear BM_SD_OFF bit:

          | power_inverted: 0  | power_inverted: 1
-------------------------------------------------
enable: 0 | SET BM_SD_OFF      | CLEAR BM_SD_OFF
-------------------------------------------------
enable: 1 | CLEAR BM_SD_OFF    | SET BM_SD_OFF

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Acked-by: Tony Prisk <linux@prisktech.co.nz>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 8 insertions, 22 deletions

diff --git a/drivers/mmc/host/wmt-sdmmc.c b/drivers/mmc/host/wmt-sdmmc.c
index 34231d5168fc..57858efb3762 100644
--- a/drivers/mmc/host/wmt-sdmmc.c
+++ b/drivers/mmc/host/wmt-sdmmc.c
@@ -212,28 +212,14 @@ struct wmt_mci_priv {
 
 static void wmt_set_sd_power(struct wmt_mci_priv *priv, int enable)
 {
-        u32 reg_tmp;
-        if (enable) {
-                if (priv->power_inverted) {
-                        reg_tmp = readb(priv->sdmmc_base + SDMMC_BUSMODE);
-                        writeb(reg_tmp | BM_SD_OFF,
-                               priv->sdmmc_base + SDMMC_BUSMODE);
-                } else {
-                        reg_tmp = readb(priv->sdmmc_base + SDMMC_BUSMODE);
-                        writeb(reg_tmp & (~BM_SD_OFF),
-                               priv->sdmmc_base + SDMMC_BUSMODE);
-                }
-        } else {
-                if (priv->power_inverted) {
-                        reg_tmp = readb(priv->sdmmc_base + SDMMC_BUSMODE);
-                        writeb(reg_tmp & (~BM_SD_OFF),
-                               priv->sdmmc_base + SDMMC_BUSMODE);
-                } else {
-                        reg_tmp = readb(priv->sdmmc_base + SDMMC_BUSMODE);
-                        writeb(reg_tmp | BM_SD_OFF,
-                               priv->sdmmc_base + SDMMC_BUSMODE);
-                }
-        }
+        u32 reg_tmp = readb(priv->sdmmc_base + SDMMC_BUSMODE);
+
+        if (enable ^ priv->power_inverted)
+                reg_tmp &= ~BM_SD_OFF;
+        else
+                reg_tmp |= BM_SD_OFF;
+
+        writeb(reg_tmp, priv->sdmmc_base + SDMMC_BUSMODE);
 }
 
 static void wmt_mci_read_response(struct mmc_host *mmc)