hw/ssi/aspeed_smc: Fix incorrect FMC_WDT2 register read on AST1030

On AST1030, reading the FMC_WDT2 register always returns 0xFFFFFFFF.
This issue is due to the aspeed_smc_read function, which checks for the
ASPEED_SMC_FEATURE_WDT_CONTROL feature. Since AST1030 was missing this
feature flag, the read operation fails and returns -1.

To resolve this, add the WDT_CONTROL feature to AST1030's feature set
so that FMC_WDT2 can be correctly accessed by firmware.

Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Fixes: 2850df6a81bcdc2e063dfdd56751ee2d11c58030 ("aspeed/smc: Add AST1030 support ")
Link: https://lore.kernel.org/qemu-devel/20250804014633.512737-1-jamin_lin@aspeedtech.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
(cherry picked from commit 13ed972b4ce57198914a37217251d30fbec20e41)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

diff --git a/hw/ssi/aspeed_smc.c b/hw/ssi/aspeed_smc.c
index 22df4be528a78debcf5ec0d286941dd9b60f74b1..194df7df77cb053940a65a5ba4139acfea5480e0 100644 (file)
--- a/hw/ssi/aspeed_smc.c
+++ b/hw/ssi/aspeed_smc.c
@@ -1761,7 +1761,8 @@ static void aspeed_1030_fmc_class_init(ObjectClass *klass, void *data)
     asc->resets            = aspeed_1030_fmc_resets;
     asc->flash_window_base = 0x80000000;
     asc->flash_window_size = 0x10000000;
-    asc->features          = ASPEED_SMC_FEATURE_DMA;
+    asc->features          = ASPEED_SMC_FEATURE_DMA |
+                             ASPEED_SMC_FEATURE_WDT_CONTROL;
     asc->dma_flash_mask    = 0x0FFFFFFC;
     asc->dma_dram_mask     = 0x000BFFFC;
     asc->nregs             = ASPEED_SMC_R_MAX;