bus: mhi: host: pci_generic: Add support for EM929x and set MRU to 32768 for better performance.

JIRA: https://issues.redhat.com/browse/RHEL-122260

commit b484fa6
Author: Adam Xue <zxue@semtech.com>
Date:   Wed May 28 10:59:43 2025 -0700

    bus: mhi: host: pci_generic: Add support for EM929x and set MRU to 32768 for better performance.
    
    Add MHI controller config for EM929x. It uses the same configuration
    as EM919x. Also set the MRU to 32768 to improve downlink throughput.
    
    02:00.0 Unassigned class [ff00]: Qualcomm Technologies, Inc Device 0308
            Subsystem: Device 18d7:0301
    
    Signed-off-by: Adam Xue <zxue@semtech.com>
    Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
    Link: https://patch.msgid.link/20250528175943.12739-1-zxue@semtech.com

Signed-off-by: Jose Ignacio Tornos Martinez <jtornosm@redhat.com>

Author: jtornosm

drivers/bus/mhi/host/pci_generic.c

@@ -698,6 +698,7 @@ static const struct mhi_pci_dev_info mhi_sierra_em919x_info = {
 	.config = &modem_sierra_em919x_config,
 	.bar_num = MHI_PCI_DEFAULT_BAR_NUM,
 	.dma_data_width = 32,
+	.mru_default = 32768,
 	.sideband_wake = false,
 };
 
@@ -855,6 +856,9 @@ static const struct pci_device_id mhi_pci_id_table[] = {
 	/* EM919x (sdx55), use the same vid:pid as qcom-sdx55m */
 	{ PCI_DEVICE_SUB(PCI_VENDOR_ID_QCOM, 0x0306, 0x18d7, 0x0200),
 		.driver_data = (kernel_ulong_t) &mhi_sierra_em919x_info },
+	/* EM929x (sdx65), use the same configuration as EM919x */
+	{ PCI_DEVICE_SUB(PCI_VENDOR_ID_QCOM, 0x0308, 0x18d7, 0x0301),
+		.driver_data = (kernel_ulong_t) &mhi_sierra_em919x_info },
 	/* Telit FN980 hardware revision v1 */
 	{ PCI_DEVICE_SUB(PCI_VENDOR_ID_QCOM, 0x0306, 0x1C5D, 0x2000),
 		.driver_data = (kernel_ulong_t) &mhi_telit_fn980_hw_v1_info },