Re: [PATCH 09/12] drm/i915: Add pipe level Gamma correction for CHV/BSW

Jani Nikula
2015-07-03T08:03:21Z

On Thu, 02 Jul 2015, Damien Lespiau <damien.lespiau@intel.com> wrote:
> On Wed, Jul 01, 2015 at 09:18:19PM +0530, Kausal Malladi wrote:
>> From: Kausal Malladi <Kausal.Malladi@intel.com>

I didn't get the series at all, and it's not in the moderation queue
either. The same happened to the last series from Kausal. What gives?

BR,
Jani.

>>
>> CHV/BSW platform supports various Gamma correction modes, which are:
>> 1. Legacy 8-bit mode
>> 2. 10-bit CGM (Color Gamut Mapping) mode
>>
>> This patch does the following:
>> 1. Adds the core function to program Gamma correction values for CHV/BSW
>> platform
>> 2. Adds Gamma correction macros/defines
>>
>> Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
>> Signed-off-by: Kausal Malladi <Kausal.Malladi@intel.com>
>> ---
>> drivers/gpu/drm/i915/i915_reg.h | 10 ++
>> drivers/gpu/drm/i915/intel_atomic.c | 6 ++
>> drivers/gpu/drm/i915/intel_color_manager.c | 154 +++++++++++++++++++++++++++++
>> drivers/gpu/drm/i915/intel_color_manager.h | 12 +++
>> drivers/gpu/drm/i915/intel_drv.h | 2 +
>> 5 files changed, 184 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
>> index 313b1f9..36672e7 100644
>> --- a/drivers/gpu/drm/i915/i915_reg.h
>> +++ b/drivers/gpu/drm/i915/i915_reg.h
>> @@ -7900,4 +7900,14 @@ enum skl_disp_power_wells {
>> #define _PALETTE_A (dev_priv->info.display_mmio_offset + 0xa000)
>> #define _PALETTE_B (dev_priv->info.display_mmio_offset + 0xa800)
>>
>> +/* Color Management */
>> +#define PIPEA_CGM_CONTROL (VLV_DISPLAY_BASE + 0x67A00)
>> +#define PIPEA_CGM_GAMMA_MIN (VLV_DISPLAY_BASE + 0x67000)
>> +#define CGM_OFFSET 0x2000
>> +#define GAMMA_OFFSET 0x2000
>> +#define _PIPE_CGM_CONTROL(pipe) \
>> + (PIPEA_CGM_CONTROL + (pipe * CGM_OFFSET))
>> +#define _PIPE_GAMMA_BASE(pipe) \
>> + (PIPEA_CGM_GAMMA_MIN + (pipe * GAMMA_OFFSET))
>
> We use the _PIPE() macro with tha pipe A and B registers for those ,
> instead of having to defies the offsets.
>
>> #endif /* _I915_REG_H_ */
>> diff --git a/drivers/gpu/drm/i915/intel_atomic.c b/drivers/gpu/drm/i915/intel_atomic.c
>> index d2674a6..21f0ac2 100644
>> --- a/drivers/gpu/drm/i915/intel_atomic.c
>> +++ b/drivers/gpu/drm/i915/intel_atomic.c
>> @@ -473,6 +473,12 @@ int intel_crtc_atomic_set_property(struct drm_crtc *crtc,
>> struct drm_property *property,
>> uint64_t val)
>> {
>> + struct drm_device *dev = crtc->dev;
>> + struct drm_mode_config *config = &dev->mode_config;
>> +
>> + if (property == config->prop_palette_after_ctm)
>> + return intel_color_manager_set_gamma(dev, &crtc->base, val);
>> +
>> DRM_DEBUG_KMS("Unknown crtc property '%s'\n", property->name);
>> return -EINVAL;
>> }
>
> You are touching the hardware instead of staging the configuration?
>
>> diff --git a/drivers/gpu/drm/i915/intel_color_manager.c b/drivers/gpu/drm/i915/intel_color_manager.c
>> index 71b4c05..84cc3e47 100644
>> --- a/drivers/gpu/drm/i915/intel_color_manager.c
>> +++ b/drivers/gpu/drm/i915/intel_color_manager.c
>> @@ -27,6 +27,160 @@
>>
>> #include "intel_color_manager.h"
>>
>> +int chv_set_gamma(struct drm_device *dev, uint32_t blob_id,
>> + struct drm_crtc *crtc)
>> +{
>> + if (num_samples == 0) {
>
> [...]
>
>> + } else if (num_samples == CHV_8BIT_GAMMA_MAX_VALS) {
>
> [...]
>> + } else if (num_samples == CHV_10BIT_GAMMA_MAX_VALS) {
>
> [...]
>
>> + } else {
>> + DRM_ERROR("Invalid number of samples for Gamma LUT\n");
>> + return -EINVAL;
>> + }
>
> This means you're not accepting 256 values, something we do today with
> the legacy ioctl() and something we probably want for generic userspace.
>
>> + ret = drm_property_replace_global_blob(dev, &blob, length,
>> + (void *) gamma_data, &crtc->base,
>> + config->prop_palette_after_ctm);
>> +
>> + if (ret) {
>> + DRM_ERROR("Error updating Gamma blob\n");
>> + return -EFAULT;
>> + }
>> +
>> + return ret;
>> +}
>> +
>> +int intel_color_manager_set_gamma(struct drm_device *dev,
>> + struct drm_mode_object *obj, uint32_t blob_id)
>> +{
>> + struct drm_crtc *crtc = obj_to_crtc(obj);
>> +
>> + if (IS_CHERRYVIEW(dev))
>> + return chv_set_gamma(dev, blob_id, crtc);
>> +
>> + return -EINVAL;
>> +}
>> +
>> int get_chv_pipe_capabilities(struct drm_device *dev,
>> struct drm_color_caps *color_caps, struct drm_crtc *crtc)
>> {
>> diff --git a/drivers/gpu/drm/i915/intel_color_manager.h b/drivers/gpu/drm/i915/intel_color_manager.h
>> index 32262ac..d83567a 100644
>> --- a/drivers/gpu/drm/i915/intel_color_manager.h
>> +++ b/drivers/gpu/drm/i915/intel_color_manager.h
>> @@ -31,6 +31,8 @@
>> #define CHV_PALETTE_STRUCT_VERSION 1
>> #define CHV_CTM_STRUCT_VERSION 1
>> #define CHV_PLATFORM_STRUCT_VERSION 1
>> +#define CHV_GAMMA_DATA_STRUCT_VERSION 1
>> +
>> #define CHV_MAX_PALETTE_CAPS_BEFORE_CTM 1
>> #define CHV_MAX_PALETTE_CAPS_AFTER_CTM 2
>> #define CHV_DEGAMMA_PRECISION 14
>> @@ -43,6 +45,16 @@
>> #define CHV_10BIT_GAMMA_MAX_VALS 257
>> #define CHV_8BIT_GAMMA_PRECISION 8
>> #define CHV_8BIT_GAMMA_MAX_VALS 256
>> +#define CHV_8BIT_GAMMA_MSB_SHIFT 8
>> +#define CHV_8BIT_GAMMA_SHIFT_RED_REG 16
>> +#define CHV_8BIT_GAMMA_SHIFT_GREEN_REG 8
>> +#define CHV_10BIT_GAMMA_MSB_SHIFT 6
>> +#define CHV_GAMMA_SHIFT_GREEN 16
>> +
>> #define CHV_CSC_COEFF_MAX_PRECISION 12
>> #define CHV_CSC_COEFF_MAX_INT 7
>> #define CHV_CSC_COEFF_MIN_INT -7
>> +
>> +/* CHV CGM Block */
>> +/* Bit 2 to be enabled in CGM block for CHV */
>> +#define CGM_GAMMA_EN 4
>> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
>> index 053ceb0..a7aaadf 100644
>> --- a/drivers/gpu/drm/i915/intel_drv.h
>> +++ b/drivers/gpu/drm/i915/intel_drv.h
>> @@ -1453,5 +1453,7 @@ extern const struct drm_plane_helper_funcs intel_plane_helper_funcs;
>> /* intel_color_manager.c */
>> void intel_color_manager_attach(struct drm_device *dev,
>> struct drm_mode_object *mode_obj);
>> +int intel_color_manager_set_gamma(struct drm_device *dev,
>> + struct drm_mode_object *obj, uint32_t blob_id);
>>
>> #endif /* __INTEL_DRV_H__ */
>> --
>> 2.4.5
>>
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--
Jani Nikula, Intel Open Source Technology Center