[PATCH] ASoC: Intel: sst: Support LPE0F28 ACPI HID

[Hans de Goede <hdegoede@redhat.com>]

Some old Bay Trail tablets which shipped with Android as factory OS
have the SST/LPE audio engine described by an ACPI device with a
HID (Hardware-ID) of LPE0F28 instead of 80860F28.

Add support for this. Note this uses a new sst_res_info for just
the LPE0F28 case because it has a different layout for the IO-mem ACPI
resources then the 80860F28.

An example of a tablet which needs this is the Vexia EDU ATLA 10 tablet,
which has been distributed to schools in the Spanish Andalucía region.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 sound/hda/intel-dsp-config.c        |  4 ++
 sound/soc/intel/atom/sst/sst_acpi.c | 64 +++++++++++++++++++++++++----
 2 files changed, 59 insertions(+), 9 deletions(-)

diff --git a/sound/hda/intel-dsp-config.c b/sound/hda/intel-dsp-config.c
index f018bd779862..9f849e05ce79 100644
--- a/sound/hda/intel-dsp-config.c
+++ b/sound/hda/intel-dsp-config.c
@@ -721,6 +721,10 @@ static const struct config_entry acpi_config_table[] = {
 #if IS_ENABLED(CONFIG_SND_SST_ATOM_HIFI2_PLATFORM_ACPI) || \
     IS_ENABLED(CONFIG_SND_SOC_SOF_BAYTRAIL)
 /* BayTrail */
+	{
+		.flags = FLAG_SST_OR_SOF_BYT,
+		.acpi_hid = "LPE0F28",
+	},
 	{
 		.flags = FLAG_SST_OR_SOF_BYT,
 		.acpi_hid = "80860F28",
diff --git a/sound/soc/intel/atom/sst/sst_acpi.c b/sound/soc/intel/atom/sst/sst_acpi.c
index 9956dc63db74..f4c4774249ee 100644
--- a/sound/soc/intel/atom/sst/sst_acpi.c
+++ b/sound/soc/intel/atom/sst/sst_acpi.c
@@ -125,6 +125,28 @@ static const struct sst_res_info bytcr_res_info = {
 	.acpi_ipc_irq_index = 0
 };
 
+/* For "LPE0F28" ACPI device found on some Android factory OS models */
+static const struct sst_res_info lpe8086_res_info = {
+	.shim_offset = 0x140000,
+	.shim_size = 0x000100,
+	.shim_phy_addr = SST_BYT_SHIM_PHY_ADDR,
+	.ssp0_offset = 0xa0000,
+	.ssp0_size = 0x1000,
+	.dma0_offset = 0x98000,
+	.dma0_size = 0x4000,
+	.dma1_offset = 0x9c000,
+	.dma1_size = 0x4000,
+	.iram_offset = 0x0c0000,
+	.iram_size = 0x14000,
+	.dram_offset = 0x100000,
+	.dram_size = 0x28000,
+	.mbox_offset = 0x144000,
+	.mbox_size = 0x1000,
+	.acpi_lpe_res_index = 1,
+	.acpi_ddr_index = 0,
+	.acpi_ipc_irq_index = 0
+};
+
 static struct sst_platform_info byt_rvp_platform_data = {
 	.probe_data = &byt_fwparse_info,
 	.ipc_info = &byt_ipc_info,
@@ -268,10 +290,38 @@ static int sst_acpi_probe(struct platform_device *pdev)
 		mach->pdata = &chv_platform_data;
 	pdata = mach->pdata;
 
-	ret = kstrtouint(id->id, 16, &dev_id);
-	if (ret < 0) {
-		dev_err(dev, "Unique device id conversion error: %d\n", ret);
-		return ret;
+	if (!strcmp(id->id, "LPE0F28")) {
+		struct resource *rsrc;
+
+		/* Use regular BYT SST PCI VID:PID */
+		dev_id = 0x80860F28;
+		byt_rvp_platform_data.res_info = &lpe8086_res_info;
+
+		/*
+		 * The "LPE0F28" ACPI device has separate IO-mem resources for:
+		 * DDR, SHIM, MBOX, IRAM, DRAM, CFG
+		 * None of which covers the entire LPE base address range.
+		 * lpe8086_res_info.acpi_lpe_res_index points to the SHIM.
+		 * Patch this to cover the entire base address range as expected
+		 * by sst_platform_get_resources().
+		 */
+		rsrc = platform_get_resource(pdev, IORESOURCE_MEM,
+					     pdata->res_info->acpi_lpe_res_index);
+		if (!rsrc) {
+			dev_err(ctx->dev, "Invalid SHIM base\n");
+			return -EIO;
+		}
+		rsrc->start -= pdata->res_info->shim_offset;
+		rsrc->end = rsrc->start + 0x200000 - 1;
+	} else {
+		ret = kstrtouint(id->id, 16, &dev_id);
+		if (ret < 0) {
+			dev_err(dev, "Unique device id conversion error: %d\n", ret);
+			return ret;
+		}
+
+		if (soc_intel_is_byt_cr(pdev))
+			byt_rvp_platform_data.res_info = &bytcr_res_info;
 	}
 
 	dev_dbg(dev, "ACPI device id: %x\n", dev_id);
@@ -280,11 +330,6 @@ static int sst_acpi_probe(struct platform_device *pdev)
 	if (ret < 0)
 		return ret;
 
-	if (soc_intel_is_byt_cr(pdev)) {
-		/* override resource info */
-		byt_rvp_platform_data.res_info = &bytcr_res_info;
-	}
-
 	/* update machine parameters */
 	mach->mach_params.acpi_ipc_irq_index =
 		pdata->res_info->acpi_ipc_irq_index;
@@ -344,6 +389,7 @@ static void sst_acpi_remove(struct platform_device *pdev)
 }
 
 static const struct acpi_device_id sst_acpi_ids[] = {
+	{ "LPE0F28", (unsigned long)&snd_soc_acpi_intel_baytrail_machines},
 	{ "80860F28", (unsigned long)&snd_soc_acpi_intel_baytrail_machines},
 	{ "808622A8", (unsigned long)&snd_soc_acpi_intel_cherrytrail_machines},
 	{ },
-- 
2.47.0