Make UHS-I SDR the default for ESP-P4 SD_MMC

Author: lbernstone

libraries/SD_MMC/src/SD_MMC.cpp

@@ -227,6 +227,7 @@ bool SDMMCFS::begin(const char *mountpoint, bool mode1bit, bool format_if_mount_
   host.flags = SDMMC_HOST_FLAG_4BIT;
 #if defined(CONFIG_IDF_TARGET_ESP32P4) && defined(BOARD_SDMMC_SLOT) && (BOARD_SDMMC_SLOT == 0)
   host.slot = SDMMC_HOST_SLOT_0;
+  host.flags &= ~SDMMC_HOST_FLAG_DDR;
   // reconfigure slot_config to remove all pins in order to use IO_MUX
   // Use 0 instead of GPIO_NUM_NC (-1) because ESP-IDF's s_check_pin_not_set()
   // function uses !pin which doesn't work correctly with -1 (GPIO_NUM_NC)
@@ -244,7 +245,7 @@ bool SDMMCFS::begin(const char *mountpoint, bool mode1bit, bool format_if_mount_
     .cd = SDMMC_SLOT_NO_CD,
     .wp = SDMMC_SLOT_NO_WP,
     .width = 4,
-    .flags = 0,
+    .flags = SDMMC_SLOT_FLAG_UHS1,
   };
 #else
   host.slot = SDMMC_HOST_SLOT_1;

libraries/SD_MMC/src/SD_MMC.h

@@ -30,8 +30,12 @@
 // you can define BOARD_MAX_SDMMC_FREQ with lower value (Ex. SDMMC_FREQ_DEFAULT)
 // in pins_arduino.h for your board variant.
 #ifndef BOARD_MAX_SDMMC_FREQ
+#ifdef SOC_SDMMC_UHS_I_SUPPORTED
+#define BOARD_MAX_SDMMC_FREQ SDMMC_FREQ_SDR50
+#else
 #define BOARD_MAX_SDMMC_FREQ SDMMC_FREQ_HIGHSPEED
 #endif
+#endif
 
 namespace fs {