[PATCH 2/8] drm: add signed-range property type
Rob Clark
robdclark at gmail.com
Thu May 29 04:51:21 PDT 2014
On Thu, May 29, 2014 at 4:29 AM, David Herrmann <dh.herrmann at gmail.com> wrote:
> Hi
>
> On Thu, May 29, 2014 at 1:57 AM, Rob Clark <robdclark at gmail.com> wrote:
>> Like range, but values are signed.
>>
>> Signed-off-by: Rob Clark <robdclark at gmail.com>
>> ---
>> drivers/gpu/drm/drm_crtc.c | 45 +++++++++++++++++++++++++++++++++------------
>> include/drm/drm_crtc.h | 12 ++++++++++++
>> include/uapi/drm/drm_mode.h | 1 +
>> 3 files changed, 46 insertions(+), 12 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
>> index 61ddc66..88a0741 100644
>> --- a/drivers/gpu/drm/drm_crtc.c
>> +++ b/drivers/gpu/drm/drm_crtc.c
>> @@ -3242,6 +3242,22 @@ struct drm_property *drm_property_create_bitmask(struct drm_device *dev,
>> }
>> EXPORT_SYMBOL(drm_property_create_bitmask);
>>
>> +static struct drm_property *property_create_range(struct drm_device *dev,
>> + int flags, const char *name,
>> + uint64_t min, uint64_t max)
>> +{
>> + struct drm_property *property;
>> +
>> + property = drm_property_create(dev, flags, name, 2);
>> + if (!property)
>> + return NULL;
>> +
>> + property->values[0] = min;
>> + property->values[1] = max;
>> +
>> + return property;
>> +}
>> +
>> /**
>> * drm_property_create - create a new ranged property type
>> * @dev: drm device
>> @@ -3264,21 +3280,20 @@ struct drm_property *drm_property_create_range(struct drm_device *dev, int flags
>> const char *name,
>> uint64_t min, uint64_t max)
>> {
>> - struct drm_property *property;
>> -
>> - flags |= DRM_MODE_PROP_RANGE;
>> -
>> - property = drm_property_create(dev, flags, name, 2);
>> - if (!property)
>> - return NULL;
>> -
>> - property->values[0] = min;
>> - property->values[1] = max;
>> -
>> - return property;
>> + return property_create_range(dev, DRM_MODE_PROP_RANGE | flags,
>> + name, min, max);
>> }
>> EXPORT_SYMBOL(drm_property_create_range);
>>
>> +struct drm_property *drm_property_create_signed_range(struct drm_device *dev,
>> + int flags, const char *name,
>> + int64_t min, int64_t max)
>> +{
>> + return property_create_range(dev, DRM_MODE_PROP_SIGNED_RANGE | flags,
>> + name, I642U64(min), I642U64(max));
>> +}
>> +EXPORT_SYMBOL(drm_property_create_signed_range);
>> +
>> struct drm_property *drm_property_create_object(struct drm_device *dev,
>> int flags, const char *name, uint32_t type)
>> {
>> @@ -3718,6 +3733,12 @@ static bool drm_property_change_is_valid(struct drm_property *property,
>> if (value < property->values[0] || value > property->values[1])
>> return false;
>> return true;
>> + } else if (drm_property_type_is(property, DRM_MODE_PROP_SIGNED_RANGE)) {
>> + int64_t svalue = U642I64(value);
>> + if (svalue < U642I64(property->values[0]) ||
>> + svalue > U642I64(property->values[1]))
>> + return false;
>> + return true;
>> } else if (drm_property_type_is(property, DRM_MODE_PROP_BITMASK)) {
>> int i;
>> uint64_t valid_mask = 0;
>> diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
>> index c1c243f..9bd3551 100644
>> --- a/include/drm/drm_crtc.h
>> +++ b/include/drm/drm_crtc.h
>> @@ -64,6 +64,15 @@ struct drm_object_properties {
>> uint64_t values[DRM_OBJECT_MAX_PROPERTY];
>> };
>>
>> +static inline int64_t U642I64(uint64_t val)
>> +{
>> + return (int64_t)*((int64_t *)&val);
>
> The cast to "(int64_t)" is unneeded. Dereferencing (int64_t*) will
> always yield (int64_t).
>
> Same below.
>
> Btw., why are these macros needed? unsigned->signed conversion is
> well-defined. signed->unsigned is undefined, but I thought we rely on
> static reinterpretation in the kernel. Dunno.. maybe I'm wrong.
iirc, I added these in userspace similar to U642VOID()/VOID2U64() and
copied to kernel when I needed them there ;-)
BR,
-R
> Anyhow, this is:
>
> Reviewed-by: David Herrmann <dh.herrmann at gmail.com>
>
> Thanks
> David
>
>> +}
>> +static inline uint64_t I642U64(int64_t val)
>> +{
>> + return (uint64_t)*((uint64_t *)&val);
>> +}
>> +
>> enum drm_connector_force {
>> DRM_FORCE_UNSPECIFIED,
>> DRM_FORCE_OFF,
>> @@ -982,6 +991,9 @@ struct drm_property *drm_property_create_bitmask(struct drm_device *dev,
>> struct drm_property *drm_property_create_range(struct drm_device *dev, int flags,
>> const char *name,
>> uint64_t min, uint64_t max);
>> +struct drm_property *drm_property_create_signed_range(struct drm_device *dev,
>> + int flags, const char *name,
>> + int64_t min, int64_t max);
>> struct drm_property *drm_property_create_object(struct drm_device *dev,
>> int flags, const char *name, uint32_t type);
>> extern void drm_property_destroy(struct drm_device *dev, struct drm_property *property);
>> diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
>> index 5b530c7..ded505e 100644
>> --- a/include/uapi/drm/drm_mode.h
>> +++ b/include/uapi/drm/drm_mode.h
>> @@ -264,6 +264,7 @@ struct drm_mode_get_connector {
>> #define DRM_MODE_PROP_EXTENDED_TYPE 0x0000ffc0
>> #define DRM_MODE_PROP_TYPE(n) ((n) << 6)
>> #define DRM_MODE_PROP_OBJECT DRM_MODE_PROP_TYPE(1)
>> +#define DRM_MODE_PROP_SIGNED_RANGE DRM_MODE_PROP_TYPE(2)
>>
>> struct drm_mode_property_enum {
>> __u64 value;
>> --
>> 1.9.3
>>
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