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authorJoel Stanley <joel@jms.id.au>2020-09-16 11:34:13 +0300
committerJoel Stanley <joel@jms.id.au>2020-10-09 04:18:33 +0300
commit696029eb36c08d7b60097cae44a6269bfa68b51c (patch)
treecfb9b98171f16f50b986d270a0f6e3eab8f68e3d /drivers/gpu/drm/aspeed
parent82e1b93ad8b95a1667708164220ed137d6f3adfb (diff)
downloadlinux-696029eb36c08d7b60097cae44a6269bfa68b51c.tar.xz
drm/aspeed: Add sysfs for output settings
These settings are used by an ASPEED BMC to determine when the host is trying to drive the display over PCIe (vga_pw) and to switch the output between PCIe and the internal graphics device (dac_mux). The valid values for the dac mux are: 00: VGA mode (default, aka PCIe) 01: Graphics CRT (aka BMC internal graphics, this driver) 10: Pass through mode from video input port A 11: Pass through mode from video input port B Values for the read-only vga password register are: 1: Host driving the display 0: Host not driving the display Signed-off-by: Joel Stanley <joel@jms.id.au> Reviewed-by: Andrew Jeffery <andrew@aj.id.au> Link: https://patchwork.freedesktop.org/patch/msgid/20200916083413.777307-1-joel@jms.id.au
Diffstat (limited to 'drivers/gpu/drm/aspeed')
-rw-r--r--drivers/gpu/drm/aspeed/aspeed_gfx_drv.c71
1 files changed, 71 insertions, 0 deletions
diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
index 2b424b2b85cc..2552573cacb2 100644
--- a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
+++ b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
@@ -212,6 +212,69 @@ static const struct of_device_id aspeed_gfx_match[] = {
{ }
};
+#define ASPEED_SCU_VGA0 0x50
+#define ASPEED_SCU_MISC_CTRL 0x2c
+
+static ssize_t dac_mux_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct aspeed_gfx *priv = dev_get_drvdata(dev);
+ u32 val;
+ int rc;
+
+ rc = kstrtou32(buf, 0, &val);
+ if (rc)
+ return rc;
+
+ if (val > 3)
+ return -EINVAL;
+
+ rc = regmap_update_bits(priv->scu, ASPEED_SCU_MISC_CTRL, 0x30000, val << 16);
+ if (rc < 0)
+ return 0;
+
+ return count;
+}
+
+static ssize_t dac_mux_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct aspeed_gfx *priv = dev_get_drvdata(dev);
+ u32 reg;
+ int rc;
+
+ rc = regmap_read(priv->scu, ASPEED_SCU_MISC_CTRL, &reg);
+ if (rc)
+ return rc;
+
+ return sprintf(buf, "%u\n", (reg >> 16) & 0x3);
+}
+static DEVICE_ATTR_RW(dac_mux);
+
+static ssize_t
+vga_pw_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ struct aspeed_gfx *priv = dev_get_drvdata(dev);
+ u32 reg;
+ int rc;
+
+ rc = regmap_read(priv->scu, ASPEED_SCU_VGA0, &reg);
+ if (rc)
+ return rc;
+
+ return sprintf(buf, "%u\n", reg & 1);
+}
+static DEVICE_ATTR_RO(vga_pw);
+
+static struct attribute *aspeed_sysfs_entries[] = {
+ &dev_attr_vga_pw.attr,
+ &dev_attr_dac_mux.attr,
+ NULL,
+};
+
+static struct attribute_group aspeed_sysfs_attr_group = {
+ .attrs = aspeed_sysfs_entries,
+};
+
static int aspeed_gfx_probe(struct platform_device *pdev)
{
struct aspeed_gfx *priv;
@@ -226,6 +289,12 @@ static int aspeed_gfx_probe(struct platform_device *pdev)
if (ret)
return ret;
+ dev_set_drvdata(&pdev->dev, priv);
+
+ ret = sysfs_create_group(&pdev->dev.kobj, &aspeed_sysfs_attr_group);
+ if (ret)
+ return ret;
+
ret = drm_dev_register(&priv->drm, 0);
if (ret)
goto err_unload;
@@ -234,6 +303,7 @@ static int aspeed_gfx_probe(struct platform_device *pdev)
return 0;
err_unload:
+ sysfs_remove_group(&pdev->dev.kobj, &aspeed_sysfs_attr_group);
aspeed_gfx_unload(&priv->drm);
return ret;
@@ -243,6 +313,7 @@ static int aspeed_gfx_remove(struct platform_device *pdev)
{
struct drm_device *drm = platform_get_drvdata(pdev);
+ sysfs_remove_group(&pdev->dev.kobj, &aspeed_sysfs_attr_group);
drm_dev_unregister(drm);
aspeed_gfx_unload(drm);