Remove spi locking hack + increase max sd frequency

These two changes (mostly the former) dramatically increase
responsiveness when doing database updates; previously we were suffering
from some nasty priority inversion.

afaict the underlying need to acquire_spi seems to be fixed? i.e. spi
bus acquisition is working properly. fingers heavily heavily crossed.

1 files changed, 4 insertions, 2 deletions

diff --git a/src/drivers/spi.cpp b/src/drivers/spi.cpp
index f4d3ea6e..50799c6e 100644
--- a/src/drivers/spi.cpp
+++ b/src/drivers/spi.cpp
@@ -56,8 +56,10 @@ esp_err_t deinit_spi(void) {
   return spi_bus_free(kSpiHost);
 }
 
-std::lock_guard<std::mutex> acquire_spi(void) {
-  return std::lock_guard<std::mutex>{sSpiMutex};
+int acquire_spi(void) {
+  // Cross fingers emoji: I *think* this is now resolved???
+  // return std::lock_guard<std::mutex>{sSpiMutex};
+  return 1;
 }
 
 }  // namespace drivers