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-rw-r--r--src/soc/intel/common/block/lpc/lpc_lib.c29
1 files changed, 18 insertions, 11 deletions
diff --git a/src/soc/intel/common/block/lpc/lpc_lib.c b/src/soc/intel/common/block/lpc/lpc_lib.c
index aeac441c23..58b588e508 100644
--- a/src/soc/intel/common/block/lpc/lpc_lib.c
+++ b/src/soc/intel/common/block/lpc/lpc_lib.c
@@ -65,7 +65,7 @@ void lpc_close_pmio_windows(void)
void lpc_open_pmio_window(uint16_t base, uint16_t size)
{
- int lgir_reg_num;
+ int i, lgir_reg_num;
uint32_t lgir_reg_offset, lgir, window_size, alignment;
resource_t bridged_size, bridge_base;
@@ -76,16 +76,6 @@ void lpc_open_pmio_window(uint16_t base, uint16_t size)
bridge_base = base;
while (bridged_size < size) {
- lgir_reg_num = find_unused_pmio_window();
- if (lgir_reg_num < 0) {
- printk(BIOS_ERR,
- "LPC: Cannot open IO window: %llx size %llx\n",
- bridge_base, size - bridged_size);
- printk(BIOS_ERR, "No more IO windows\n");
- return;
- }
- lgir_reg_offset = LPC_GENERIC_IO_RANGE(lgir_reg_num);
-
/* Each IO range register can only open a 256-byte window. */
window_size = MIN(size, LPC_LGIR_MAX_WINDOW_SIZE);
@@ -97,6 +87,23 @@ void lpc_open_pmio_window(uint16_t base, uint16_t size)
lgir = (bridge_base & LPC_LGIR_ADDR_MASK) | LPC_LGIR_EN;
lgir |= ((window_size - 1) << 16) & LPC_LGIR_AMASK_MASK;
+ /* Skip programming if same range already programmed. */
+ for (i = 0; i < LPC_NUM_GENERIC_IO_RANGES; i++) {
+ if (lgir == pci_read_config32(PCH_DEV_LPC,
+ LPC_GENERIC_IO_RANGE(i)))
+ return;
+ }
+
+ lgir_reg_num = find_unused_pmio_window();
+ if (lgir_reg_num < 0) {
+ printk(BIOS_ERR,
+ "LPC: Cannot open IO window: %llx size %llx\n",
+ bridge_base, size - bridged_size);
+ printk(BIOS_ERR, "No more IO windows\n");
+ return;
+ }
+ lgir_reg_offset = LPC_GENERIC_IO_RANGE(lgir_reg_num);
+
pci_write_config32(PCH_DEV_LPC, lgir_reg_offset, lgir);
printk(BIOS_DEBUG,