patch(spi_flash): cleanup XMC flash chip usage according to new information

components/bootloader_support/bootloader_flash/src/bootloader_flash.c

@@ -670,7 +670,6 @@ void bootloader_spi_flash_reset(void)
 
 #define XMC_SUPPORT CONFIG_BOOTLOADER_FLASH_XMC_SUPPORT
 #define XMC_VENDOR_ID_1 0x20
-#define XMC_VENDOR_ID_2 0x46
 
 #if BOOTLOADER_BUILD
 #define BOOTLOADER_FLASH_LOG(level, ...)    ESP_EARLY_LOG##level(TAG, ##__VA_ARGS__)
@@ -687,7 +686,7 @@ static IRAM_ATTR bool is_xmc_chip_strict(uint32_t rdid)
     uint32_t mfid = BYTESHIFT(rdid, 1);
     uint32_t cpid = BYTESHIFT(rdid, 0);
 
-    if (vendor_id != XMC_VENDOR_ID_1 && vendor_id != XMC_VENDOR_ID_2) {
+    if (vendor_id != XMC_VENDOR_ID_1) {
         return false;
     }
 
@@ -720,7 +719,7 @@ esp_err_t IRAM_ATTR bootloader_flash_xmc_startup(void)
     // Check the Manufacturer ID in SFDP registers (JEDEC standard). If not XMC chip, no need to run the flow
     const int sfdp_mfid_addr = 0x10;
     uint8_t mf_id = (bootloader_flash_read_sfdp(sfdp_mfid_addr, 1) & 0xff);
-    if ((mf_id != XMC_VENDOR_ID_1) && (mf_id != XMC_VENDOR_ID_2)) {
+    if (mf_id != XMC_VENDOR_ID_1) {
         BOOTLOADER_FLASH_LOG(D, "non-XMC chip detected by SFDP Read (%02X), skip.", mf_id);
         return ESP_OK;
     }
@@ -752,7 +751,7 @@ esp_err_t IRAM_ATTR bootloader_flash_xmc_startup(void)
 static IRAM_ATTR bool is_xmc_chip(uint32_t rdid)
 {
     uint32_t vendor_id = (rdid >> 16) & 0xFF;
-    return ((vendor_id == XMC_VENDOR_ID_1) || (vendor_id == XMC_VENDOR_ID_2));
+    return (vendor_id == XMC_VENDOR_ID_1);
 }
 
 esp_err_t IRAM_ATTR bootloader_flash_xmc_startup(void)

components/spi_flash/Kconfig

@@ -109,6 +109,17 @@ menu "Main Flash configuration"
                 This config is used for setting Tsus parameter. Tsus means CS# high to next command after
                 suspend. You can refer to the chapter of AC CHARACTERISTICS of flash datasheet.
 
+        config SPI_FLASH_FORCE_ENABLE_XMC_C_SUSPEND
+            bool "Enable XMC-C series flash chip suspend feature anyway"
+            default n
+            help
+                XMC-C series is regarded as not qualified for the Suspend feature, since its specification
+                has a tRS >= 1ms restriction. We strongly do not suggest using it for the Suspend feature.
+                However, if your product in field has enabled this feature, you may still enable this
+                config option to keep the legacy behavior.
+
+                For new users, DO NOT enable this config.
+
     endmenu
 endmenu
 

components/spi_flash/flash_brownout_hook.c

@@ -20,7 +20,7 @@ void spi_flash_needs_reset_check(void)
 {
     // Currently only XMC is suggested to reset when brownout
 #if CONFIG_SPI_FLASH_BROWNOUT_RESET_XMC
-    if ((g_rom_flashchip.device_id >> 16) == 0x20 || (g_rom_flashchip.device_id >> 16) == 0x46) {
+    if ((g_rom_flashchip.device_id >> 16) == 0x20) {
         flash_brownout_needs_reset = true;
     }
 #endif

components/spi_flash/include/spi_flash/spi_flash_defs.h

@@ -53,6 +53,8 @@
 #define CMD_RST_EN      0x66
 #define CMD_RST_DEV     0x99
 
+#define CMD_RDSFDP     0x5A /* Read the SFDP of the flash */
+
 #define SPI_FLASH_DIO_ADDR_BITLEN       24
 #define SPI_FLASH_DIO_DUMMY_BITLEN      4
 #define SPI_FLASH_QIO_ADDR_BITLEN       24

components/spi_flash/spi_flash_chip_generic.c

@@ -599,11 +599,37 @@ spi_flash_caps_t spi_flash_chip_generic_get_caps(esp_flash_t *chip)
     // 32M-bits address support
 
     // flash suspend support
-    // XMC support suspend
-    if (chip->chip_id >> 16 == 0x20 || chip->chip_id >> 16 == 0x46) {
+    // XMC-D support suspend
+    if (chip->chip_id >> 16 == 0x46) {
         caps_flags |= SPI_FLASH_CHIP_CAP_SUSPEND;
     }
 
+    // XMC-D support suspend (some D series flash chip begin with 0x20, difference checked by SFDP)
+    if (chip->chip_id >> 16 == 0x20) {
+        uint8_t data = 0;
+        spi_flash_trans_t t = {
+            .command = CMD_RDSFDP,
+            .address_bitlen = 24,
+            .address = 0x32,
+            .mosi_len = 0,
+            .mosi_data = 0,
+            .miso_len = 1,
+            .miso_data = &data,
+            .dummy_bitlen = 8,
+        };
+        chip->host->driver->common_command(chip->host, &t);
+        if((data & 0x8) == 0x8) {
+            caps_flags |= SPI_FLASH_CHIP_CAP_SUSPEND;
+        }
+    }
+
+#if CONFIG_SPI_FLASH_FORCE_ENABLE_XMC_C_SUSPEND
+    // XMC-C suspend has big risk. But can enable this anyway.
+    if (chip->chip_id >> 16 == 0x20) {
+        caps_flags |= SPI_FLASH_CHIP_CAP_SUSPEND;
+    }
+#endif
+
     // FM support suspend
     if (chip->chip_id >> 16 == 0xa1) {
         caps_flags |= SPI_FLASH_CHIP_CAP_SUSPEND;