rockchip: drmhwc2: limit framebuffer for low-ram device

Signed-off-by: hmz007 <hmz007@gmail.com>

hardware/rockchip/hwcomposer/drmhwc2/drmhwctwo.cpp

@@ -1367,12 +1367,19 @@ HWC2::Error DrmHwcTwo::HwcDisplay::GetDisplayConfigs(uint32_t *num_configs,
        * RK3588/RK3576：Limit to 4096x2160 if large than 2160p
        * Other:  Limit to 1920x1080 if large than 2160p
        */
-      if(isRK3588(resource_manager_->getSocId()) || isRK3576(resource_manager_->getSocId())){
+      bool low_ram_device = property_get_bool("ro.config.low_ram", false);
+      if (low_ram_device) {
+        if (ctx_.framebuffer_height >= 2160 && ctx_.framebuffer_width >= ctx_.framebuffer_height) {
+          HWC2_ALOGD_IF_DEBUG("Limit framebuffer for low-ram device");
+          ctx_.framebuffer_width  >>= 1;
+          ctx_.framebuffer_height >>= 1;
+        }
+      } else if (isRK3588(resource_manager_->getSocId()) || isRK3576(resource_manager_->getSocId())) {
         if (ctx_.framebuffer_height >= 2160 && ctx_.framebuffer_width >= ctx_.framebuffer_height) {
           ctx_.framebuffer_width = ctx_.framebuffer_width * (2160.0 / ctx_.framebuffer_height);
           ctx_.framebuffer_height = 2160;
         }
-      }else{
+      } else {
         if (ctx_.framebuffer_height >= 2160 && ctx_.framebuffer_width >= ctx_.framebuffer_height) {
           ctx_.framebuffer_width = ctx_.framebuffer_width * (1080.0 / ctx_.framebuffer_height);
           ctx_.framebuffer_height = 1080;