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SubjectRe: [PATCH] drm/i915/opregion: work around buggy firmware that provides 8+ output devices
On 02/12/2014 06:31 PM, Chris Wilson wrote:
> On Wed, Feb 12, 2014 at 11:05:40AM +0800, Aaron Lu wrote:
>> The ACPI table on ASUS UX302LA has more than 8 output devices under the
>> graphics controller device node. The problem is, the real active output
>> device, the LCD panel, is listed the last. The result is, the LCD's
>> device id doesn't get recorded in the active device list CADL array and
>> when the _DCS control method for the LCD device is executed, it returns
>> 0x1d, meaning it is not active. This affects the hotkey delivery ASL
>> code that will not deliver a notification if the output device is not
>> active on backlight hotkey press.
>>
>> I don't see a clean way to solve this problem since the operation region
>> spec doesn't allow more than 8 output devices so we have no way of
>> storing all these output devices. The fact that output devices that have
>> _BCM control method usually means they have a higher possibility of being
>> used than those who don't made me choose a simple way to work around
>> the buggy firmware by replacing the last entry in CADL array with the one
>> that has _BCM control method. There is no specific reason why the last
>> entry is picked instead of others.
>
> Another possibility is that the connector list is in rough priority
> order so might be useful for sorting the CADL array.
>
> Since the CADL should only be a list of currently active devices, we
> could just bite the bullet and repopulate it correctly after every
> setcrtc.

Thanks for the suggestion. As a first step, does the following un-tested
patch look OK?

diff --git a/drivers/gpu/drm/i915/intel_opregion.c b/drivers/gpu/drm/i915/intel_opregion.c
index acde2945eb8a..afdd7d84fb32 100644
--- a/drivers/gpu/drm/i915/intel_opregion.c
+++ b/drivers/gpu/drm/i915/intel_opregion.c
@@ -220,11 +220,11 @@ struct opregion_asle {
#define SWSCI_SBCB_POST_VBE_PM SWSCI_FUNCTION_CODE(SWSCI_SBCB, 19)
#define SWSCI_SBCB_ENABLE_DISABLE_AUDIO SWSCI_FUNCTION_CODE(SWSCI_SBCB, 21)

-#define ACPI_OTHER_OUTPUT (0<<8)
-#define ACPI_VGA_OUTPUT (1<<8)
-#define ACPI_TV_OUTPUT (2<<8)
-#define ACPI_DIGITAL_OUTPUT (3<<8)
-#define ACPI_LVDS_OUTPUT (4<<8)
+#define ACPI_OTHER_OUTPUT 0
+#define ACPI_VGA_OUTPUT 1
+#define ACPI_TV_OUTPUT 2
+#define ACPI_DIGITAL_OUTPUT 3
+#define ACPI_LVDS_OUTPUT 4

#define MAX_DSLP 1500

@@ -616,6 +616,7 @@ static void intel_didl_outputs(struct drm_device *dev)
acpi_status status;
u32 temp;
int i = 0;
+ int index[5] = {0};

handle = ACPI_HANDLE(&dev->pdev->dev);
if (!handle || acpi_bus_get_device(handle, &acpi_dev))
@@ -693,8 +694,8 @@ blind_set:
break;
}
temp = ioread32(&opregion->acpi->didl[i]);
- iowrite32(temp | (1<<31) | output_type | i,
- &opregion->acpi->didl[i]);
+ iowrite32(temp | (1<<31) | (output_type << 8) |
+ index[output_type]++, &opregion->acpi->didl[i]);
i++;
}
goto end;
@@ -705,18 +706,44 @@ static void intel_setup_cadls(struct drm_device *dev)
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_opregion *opregion = &dev_priv->opregion;
int i = 0;
+ int index[5] = {0};
u32 disp_id;
+ struct drm_connector *connector;
+
+ list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+ int output_type = ACPI_OTHER_OUTPUT;

- /* Initialize the CADL field by duplicating the DIDL values.
- * Technically, this is not always correct as display outputs may exist,
- * but not active. This initialization is necessary for some Clevo
- * laptops that check this field before processing the brightness and
- * display switching hotkeys. Just like DIDL, CADL is NULL-terminated if
- * there are less than eight devices. */
- do {
- disp_id = ioread32(&opregion->acpi->didl[i]);
+ switch (connector->connector_type) {
+ case DRM_MODE_CONNECTOR_VGA:
+ case DRM_MODE_CONNECTOR_DVIA:
+ output_type = ACPI_VGA_OUTPUT;
+ break;
+ case DRM_MODE_CONNECTOR_Composite:
+ case DRM_MODE_CONNECTOR_SVIDEO:
+ case DRM_MODE_CONNECTOR_Component:
+ case DRM_MODE_CONNECTOR_9PinDIN:
+ output_type = ACPI_TV_OUTPUT;
+ break;
+ case DRM_MODE_CONNECTOR_DVII:
+ case DRM_MODE_CONNECTOR_DVID:
+ case DRM_MODE_CONNECTOR_DisplayPort:
+ case DRM_MODE_CONNECTOR_HDMIA:
+ case DRM_MODE_CONNECTOR_HDMIB:
+ output_type = ACPI_DIGITAL_OUTPUT;
+ break;
+ case DRM_MODE_CONNECTOR_eDP:
+ case DRM_MODE_CONNECTOR_LVDS:
+ output_type = ACPI_LVDS_OUTPUT;
+ break;
+ }
+ disp_id = (opregion->acpi->didl[0] & (1 << 31)) |
+ (output_type << 8) | index[output_type]++;
iowrite32(disp_id, &opregion->acpi->cadl[i]);
- } while (++i < 8 && disp_id != 0);
+ i++;
+ }
+
+ if (i < 8)
+ iowrite32(0, &opregion->acpi->cadl[i]);
}

void intel_opregion_init(struct drm_device *dev)

Thanks,
Aaron


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