From 1989d85b915c75d2b414fa143e372954ea6b3347 Mon Sep 17 00:00:00 2001
From: Florent Kermarrec <florent@enjoy-digital.fr>
Date: Mon, 11 Apr 2022 09:52:00 +0200
Subject: [PATCH] software/libbase/i2c/i2c_poll: Also test for write when
 polling since some I2C devices do not respond to read or require a specific
 protocol.

---
 litex/soc/software/libbase/i2c.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/litex/soc/software/libbase/i2c.c b/litex/soc/software/libbase/i2c.c
index a36e986c5..b4ad80444 100644
--- a/litex/soc/software/libbase/i2c.c
+++ b/litex/soc/software/libbase/i2c.c
@@ -261,7 +261,8 @@ bool i2c_poll(unsigned char slave_addr)
     bool result;
 
     i2c_start();
-    result = i2c_transmit_byte(I2C_ADDR_RD(slave_addr));
+    result  = i2c_transmit_byte(I2C_ADDR_WR(slave_addr));
+    result |= i2c_transmit_byte(I2C_ADDR_RD(slave_addr));
     i2c_stop();
 
     return result;