Clean up command packing on MRST.

Don't pass more bytes in the command length field than we filled.

Signed-off-by: Andy Ross <andy.ross@windriver.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

1 files changed, 11 insertions, 18 deletions

diff --git a/drivers/platform/x86/intel_scu_ipc.c b/drivers/platform/x86/intel_scu_ipc.c
index b903420fa973..5055c523c5e2 100644
--- a/drivers/platform/x86/intel_scu_ipc.c
+++ b/drivers/platform/x86/intel_scu_ipc.c
@@ -154,7 +154,7 @@ static inline int busy_loop(void) /* Wait till scu status is busy */
 /* Read/Write power control(PMIC in Langwell, MSIC in PenWell) registers */
 static int pwr_reg_rdwr(u16 *addr, u8 *data, u32 count, u32 op, u32 id)
 {
-        int nc;
+        int i, nc, bytes;
         u32 offset = 0;
         u32 err = 0;
         u8 cbuf[IPC_WWBUF_SIZE] = { };
@@ -170,25 +170,18 @@ static int pwr_reg_rdwr(u16 *addr, u8 *data, u32 count, u32 op, u32 id)
         }
 
         if (platform != MRST_CPU_CHIP_PENWELL) {
-                /* Entry is 4 bytes for read/write, 5 bytes for read modify */
-                for (nc = 0; nc < count; nc++, offset += 3) {
-                        cbuf[offset] = addr[nc];
-                        cbuf[offset + 1] = addr[nc] >> 8;
+                bytes = 0;
+                for(i=0; i<count; i++) {
+                        cbuf[bytes++] = addr[i];
+                        cbuf[bytes++] = addr[i] >> 8;
                         if (id != IPC_CMD_PCNTRL_R)
-                                cbuf[offset + 2] = data[nc];
-                        if (id == IPC_CMD_PCNTRL_M) {
-                                cbuf[offset + 3] = data[nc + 1];
-                                offset += 1;
-                        }
+                                cbuf[bytes++] = data[i];
+                        if (id == IPC_CMD_PCNTRL_M)
+                                cbuf[bytes++] = data[i + 1];
                 }
-                for (nc = 0, offset = 0; nc < count; nc++, offset += 4)
-                        ipc_data_writel(wbuf[nc], offset); /* Write wbuff */
-
-                if (id != IPC_CMD_PCNTRL_M)
-                        ipc_command((count*4) << 16 |  id << 12 | 0 << 8 | op);
-                else
-                        ipc_command((count*5) << 16 |  id << 12 | 0 << 8 | op);
-
+                for(i=0; i<bytes; i+=4)
+                        ipc_data_writel(wbuf[i/4], i);
+                ipc_command(bytes << 16 |  id << 12 | 0 << 8 | op);
         } else {
                 for (nc = 0; nc < count; nc++, offset += 2) {
                         cbuf[offset] = addr[nc];