From 64b96869a3ed4b7c9e41c1a3e8410c3ec2582ca9 Mon Sep 17 00:00:00 2001 From: "Luke D. Jones" Date: Tue, 20 Jun 2023 12:48:31 +1200 Subject: [PATCH 06/13] platform/x86: asus-wmi: add safety checks to gpu switching Add safety checking to dgpu_disable, egpu_enable, gpu_mux_mode. These checks prevent users from doing such things as: - disabling the dGPU while is muxed to drive the internal screen - enabling the eGPU which also disables the dGPU, while muxed to the internal screen - switching the MUX to dGPU while the dGPU is disabled Signed-off-by: Luke D. Jones --- drivers/platform/x86/asus-wmi.c | 50 ++++++++++++++++++++++++++++++++- 1 file changed, 49 insertions(+), 1 deletion(-) diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c index 3cb7cee110e2..7e80ea2a802a 100644 --- a/drivers/platform/x86/asus-wmi.c +++ b/drivers/platform/x86/asus-wmi.c @@ -645,6 +645,18 @@ static ssize_t dgpu_disable_store(struct device *dev, if (disable > 1) return -EINVAL; + if (asus->gpu_mux_mode_available) { + result = asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_GPU_MUX); + if (result < 0) + /* An error here may signal greater failure of GPU handling */ + return result; + if (!result && disable) { + err = -ENODEV; + pr_warn("Can not disable dGPU when the MUX is in dGPU mode: %d\n", err); + return err; + } + } + err = asus_wmi_set_devstate(ASUS_WMI_DEVID_DGPU, disable, &result); if (err) { pr_warn("Failed to set dgpu disable: %d\n", err); @@ -693,7 +705,7 @@ static ssize_t egpu_enable_store(struct device *dev, if (enable > 1) return -EINVAL; - err = asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_EGPU_CONNECTED); + result = asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_EGPU_CONNECTED); if (err < 0) return err; if (err < 1) { @@ -702,6 +714,18 @@ static ssize_t egpu_enable_store(struct device *dev, return err; } + if (asus->gpu_mux_mode_available) { + result = asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_GPU_MUX); + if (result < 0) + /* An error here may signal greater failure of GPU handling */ + return result; + if (!result && enable) { + err = -ENODEV; + pr_warn("Can not enable eGPU when the MUX is in dGPU mode: %d\n", err); + return err; + } + } + err = asus_wmi_set_devstate(ASUS_WMI_DEVID_EGPU, enable, &result); if (err) { pr_warn("Failed to set egpu disable: %d\n", err); @@ -764,6 +788,30 @@ static ssize_t gpu_mux_mode_store(struct device *dev, if (optimus > 1) return -EINVAL; + if (asus->dgpu_disable_available) { + result = asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_DGPU); + if (result < 0) + /* An error here may signal greater failure of GPU handling */ + return result; + if (result && !optimus) { + err = -ENODEV; + pr_warn("Can not switch MUX to dGPU mode when dGPU is disabled: %d\n", err); + return err; + } + } + + if (asus->egpu_enable_available) { + result = asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_EGPU); + if (result < 0) + /* An error here may signal greater failure of GPU handling */ + return result; + if (result && !optimus) { + err = -ENODEV; + pr_warn("Can not switch MUX to dGPU mode when eGPU is enabled: %d\n", err); + return err; + } + } + err = asus_wmi_set_devstate(ASUS_WMI_DEVID_GPU_MUX, optimus, &result); if (err) { dev_err(dev, "Failed to set GPU MUX mode: %d\n", err); -- 2.41.0