doc: recommend turn on psram xip feature for bounbe buffer mode

components/esp_lcd/src/esp_lcd_panel_rgb.c

@@ -225,10 +225,6 @@ esp_err_t esp_lcd_new_rgb_panel(const esp_lcd_rgb_panel_config_t *rgb_panel_conf
                       ESP_ERR_INVALID_ARG, err, TAG, "must set bounce buffer if there's no frame buffer");
     ESP_GOTO_ON_FALSE(!(rgb_panel_config->flags.refresh_on_demand && rgb_panel_config->bounce_buffer_size_px),
                       ESP_ERR_INVALID_ARG, err, TAG, "refresh on demand is not supported under bounce buffer mode");
-#if CONFIG_LCD_RGB_ISR_IRAM_SAFE
-    ESP_GOTO_ON_FALSE(rgb_panel_config->bounce_buffer_size_px == 0,
-                      ESP_ERR_INVALID_ARG, err, TAG, "bounce buffer mode is not IRAM Safe");
-#endif
 
     // determine number of framebuffers
     size_t num_fbs = 1;

components/esp_lcd/test_apps/rgb_lcd/main/test_rgb_panel.c

@@ -159,8 +159,6 @@ TEST_CASE("lcd_rgb_panel_refresh_on_demand", "[lcd]")
     free(img);
 }
 
-#if !CONFIG_LCD_RGB_ISR_IRAM_SAFE
-// bounce buffer mode is not IRAM safe, so we don't test it
 TEST_CASE("lcd_rgb_panel_bounce_buffer", "[lcd]")
 {
     uint8_t *img = malloc(TEST_IMG_SIZE);
@@ -184,7 +182,6 @@ TEST_CASE("lcd_rgb_panel_bounce_buffer", "[lcd]")
     TEST_ESP_OK(esp_lcd_panel_del(panel_handle));
     free(img);
 }
-#endif
 
 TEST_CASE("lcd_rgb_panel_update_pclk", "[lcd]")
 {

components/esp_lcd/test_apps/rgb_lcd/sdkconfig.ci.iram_safe

@@ -1,6 +1,8 @@
 CONFIG_COMPILER_DUMP_RTL_FILES=y
 CONFIG_LCD_RGB_ISR_IRAM_SAFE=y
 CONFIG_GDMA_CTRL_FUNC_IN_IRAM=y
+# bounce buffer mode relies on GDMA EOF interrupt to be service-able
+CONFIG_GDMA_ISR_IRAM_SAFE=y
 CONFIG_COMPILER_OPTIMIZATION_NONE=y
 # silent the error check, as the error string are stored in rodata, causing RTL check failure
 CONFIG_COMPILER_OPTIMIZATION_CHECKS_SILENT=y

components/esp_lcd/test_apps/rgb_lcd/sdkconfig.defaults.esp32s3

@@ -1,3 +1,7 @@
 CONFIG_SPIRAM=y
 CONFIG_SPIRAM_MODE_OCT=y
 CONFIG_SPIRAM_SPEED_80M=y
+
+# Enable the XIP-PSRAM feature, so the ext-mem cache won't be disabled when SPI1 is operating the main flash
+CONFIG_SPIRAM_FETCH_INSTRUCTIONS=y
+CONFIG_SPIRAM_RODATA=y