drm: smidrm: fix build with clang

deepin inclusion
category: bugfix

Log:

2025-11-20T02:25:18.6651568Z   CC [M]  drivers/gpu/drm/i915/i915_pmu.o
2025-11-20T02:25:18.6810866Z drivers/gpu/drm/smidrm/ddk768/uda1345.c:142:5: error: variable 'addr' is used uninitialized whenever switch default is taken [-Werror,-Wsometimes-uninitialized]
2025-11-20T02:25:18.6811696Z   142 |     default:
2025-11-20T02:25:18.6811960Z       |     ^~~~~~~
2025-11-20T02:25:18.6812468Z drivers/gpu/drm/smidrm/ddk768/uda1345.c:147:20: note: uninitialized use occurs here
2025-11-20T02:25:18.6813024Z   147 |                    addr, &data, 1);
2025-11-20T02:25:18.6813378Z       |                    ^~~~
2025-11-20T02:25:18.6814001Z drivers/gpu/drm/smidrm/ddk768/uda1345.c:121:12: note: initialize the variable 'addr' to silence this warning
2025-11-20T02:25:18.6814576Z   121 |     u8 addr;
2025-11-20T02:25:18.6814827Z       |            ^
2025-11-20T02:25:18.6815075Z       |             = '\0'
Signed-off-by: Wentao Guan <guanwentao@uniontech.com>

Author: opsiff

drivers/gpu/drm/smidrm/ddk750/ddk750_swi2c.c

@@ -184,8 +184,12 @@ static unsigned char swI2CReadSDA(void)
         return 0;
 }
 
+#ifdef __clang__
+#pragma clang optimize off
+#else
 #pragma GCC push_options
 #pragma GCC optimize("O0")
+#endif
 
 /*
  *  This function sends ACK signal
@@ -336,7 +340,12 @@ static unsigned char swI2CReadByte(unsigned char ack)
 
     return data;
 }
+
+#ifdef __clang__
+#pragma clang optimize on
+#else
 #pragma GCC pop_options
+#endif
 
 /*
  * This function initializes the i2c attributes and bus

drivers/gpu/drm/smidrm/ddk768/ddk768_swi2c.c

@@ -258,8 +258,12 @@ static void ddk768_swI2CSCL(unsigned char value)
         pokeRegisterDWord(g_i2cClkGPIODataDirReg, ulGPIODirection);
     }
 }
+#ifdef __clang__
+#pragma clang optimize off
+#else
 #pragma GCC push_options
 #pragma GCC optimize("O0")
+#endif
 /*
  *  This function sends ACK signal
  */
@@ -390,7 +394,11 @@ static long ddk768_swI2CWriteByte(unsigned char data)
         return (-1);
 }
 
+#ifdef __clang__
+#pragma clang optimize on
+#else
 #pragma GCC pop_options
+#endif
 
 static long ddk768_swI2CSetGPIO(
     unsigned char i2cClkGPIO,

drivers/gpu/drm/smidrm/ddk768/uda1345.c

@@ -140,7 +140,7 @@ static int uda1345_write(unsigned int reg,
         addr = UDA1345_DATA_ADDR;
         break;
     default:
-        break;
+        return -1;
     }
 
     ret = l3_write(&falcon_uda1345.l3,