Misc HW patches for 2025-10-21

[PULL 13/45] hw/i2c/smbus_eeprom: Add minimum write recovery time for DDR2

Philippe Mathieu-Daudé posted 45 patches 3 weeks, 2 days ago

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Maintainers: Paolo Bonzini <pbonzini@redhat.com>, "Daniel P. Berrangé" <berrange@redhat.com>, Eduardo Habkost <eduardo@habkost.net>, Gerd Hoffmann <kraxel@redhat.com>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, "Philippe Mathieu-Daudé" <philmd@linaro.org>, Yanan Wang <wangyanan55@huawei.com>, Zhao Liu <zhao1.liu@intel.com>, Alistair Francis <alistair@alistair23.me>, Corey Minyard <cminyard@mvista.com>, "Michael S. Tsirkin" <mst@redhat.com>, Richard Henderson <richard.henderson@linaro.org>, John Snow <jsnow@redhat.com>, "Edgar E. Iglesias" <edgar.iglesias@gmail.com>, Peter Maydell <peter.maydell@linaro.org>, Francisco Iglesias <francisco.iglesias@amd.com>, Vikram Garhwal <vikram.garhwal@bytedance.com>, Pavel Pisa <pisa@cmp.felk.cvut.cz>, Jason Wang <jasowang@redhat.com>, Jia Liu <proljc@gmail.com>, Stafford Horne <shorne@gmail.com>, "Hervé Poussineau" <hpoussin@reactos.org>, Bernhard Beschow <shentey@gmail.com>, Nicholas Piggin <npiggin@gmail.com>, Harsh Prateek Bora <harshpb@linux.ibm.com>, David Hildenbrand <david@redhat.com>, Stefano Stabellini <sstabellini@kernel.org>, Anthony PERARD <anthony@xenproject.org>, Paul Durrant <paul@xen.org>, Pierrick Bouvier <pierrick.bouvier@linaro.org>, Cameron Esfahani <dirty@apple.com>, Roman Bolshakov <rbolshakov@ddn.com>, Phil Dennis-Jordan <phil@philjordan.eu>, Marcelo Tosatti <mtosatti@redhat.com>, Sunil Muthuswamy <sunilmut@microsoft.com>, Fabiano Rosas <farosas@suse.de>, Laurent Vivier <lvivier@redhat.com>

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[PULL 13/45] hw/i2c/smbus_eeprom: Add minimum write recovery time for DDR2

Posted by Philippe Mathieu-Daudé 3 weeks, 2 days ago

From: BALATON Zoltan <balaton@eik.bme.hu>

This is needed for newer u-boot-sam460ex versions to pass the DRAM
setup.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20251008122502.9DA8956F301@zero.eik.bme.hu>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 hw/i2c/smbus_eeprom.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/i2c/smbus_eeprom.c b/hw/i2c/smbus_eeprom.c
index 0a1088fbb0a..26e211b31ad 100644
--- a/hw/i2c/smbus_eeprom.c
+++ b/hw/i2c/smbus_eeprom.c
@@ -288,6 +288,7 @@ uint8_t *spd_data_generate(enum sdram_type type, ram_addr_t ram_size)
     spd[33] = 8;    /* addr/cmd hold time */
     spd[34] = 20;   /* data input setup time */
     spd[35] = 8;    /* data input hold time */
+    spd[36] = (type == DDR2 ? 13 << 2 : 0); /* min. write recovery time */
 
     /* checksum */
     for (i = 0; i < 63; i++) {
-- 
2.51.0