Thanks for your time and review.
Please find my comments inline.
Regards
Shashank
On 9/10/2014 4:21 AM, Bob Paauwe wrote:
On Tue, 9 Sep 2014 11:53:15 +0530
<shashank.sha...@intel.com> wrote:
From: Shashank Sharma <shashank.sha...@intel.com>
This patch adds support for CSC correction color property.
It does the following:
1. Creates a new DRM property for CSC correction. Adds this into
mode_config.
2. Attaches this CSC property to calling CRTC. Creates a blob
to store the correction values, and attaches the blob to CRTC.
3. Adds function intel_clrmgr_set_csc: This is a wrapper function
which checks the platform type, and calls the valleyview
specific set_csc function. As different platforms may have different
methods of setting CSC, wrapper function is required to route to proper
core CSC set function. In future, the support for other platfroms can be
plugged-in here. Adding this function as .set_property CSC color property.
4. Adds function vlv_set_csc: core function to program CSC coefficients as per
vlv specs, and then enable CSC.
Signed-off-by: Shashank Sharma <shashank.sha...@intel.com>
---
drivers/gpu/drm/drm_crtc.c | 4 +-
drivers/gpu/drm/i915/i915_reg.h | 11 ++
drivers/gpu/drm/i915/intel_clrmgr.c | 208 +++++++++++++++++++++++++++++++++++-
drivers/gpu/drm/i915/intel_clrmgr.h | 16 +++
drivers/gpu/drm/i915/intel_drv.h | 1 +
include/drm/drm_crtc.h | 7 ++
6 files changed, 244 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 272b66f..be9d110 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -3917,7 +3917,7 @@ done:
return ret;
}
-static struct drm_property_blob *drm_property_create_blob(struct drm_device
*dev, int length,
+struct drm_property_blob *drm_property_create_blob(struct drm_device *dev, int
length,
void *data)
{
struct drm_property_blob *blob;
@@ -3944,7 +3944,7 @@ static struct drm_property_blob
*drm_property_create_blob(struct drm_device *dev
return blob;
}
-static void drm_property_destroy_blob(struct drm_device *dev,
+void drm_property_destroy_blob(struct drm_device *dev,
struct drm_property_blob *blob)
{
drm_mode_object_put(dev, &blob->base);
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 20673cc..e3010b3 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6183,6 +6183,17 @@ enum punit_power_well {
#define PIPE_CSC_POSTOFF_ME(pipe) _PIPE(pipe, _PIPE_A_CSC_POSTOFF_ME,
_PIPE_B_CSC_POSTOFF_ME)
#define PIPE_CSC_POSTOFF_LO(pipe) _PIPE(pipe, _PIPE_A_CSC_POSTOFF_LO,
_PIPE_B_CSC_POSTOFF_LO)
+/* VLV color correction registers */
+/* CSC */
+#define PIPECONF_CSC_ENABLE (1 << 15)
+#define _PIPEACSC (dev_priv->info.display_mmio_offset + \
+ 0x600b0)
+#define _PIPEBCSC (dev_priv->info.display_mmio_offset + \
+ 0x610b0)
+#define PIPECSC(pipe) (_PIPEACSC + (pipe * CSC_OFFSET))
+#define CSC_OFFSET (_PIPEBCSC - _PIPEACSC)
+#define PIPECSC(pipe) (_PIPEACSC + (pipe * CSC_OFFSET))
+
/* VLV MIPI registers */
#define _MIPIA_PORT_CTRL (VLV_DISPLAY_BASE + 0x61190)
diff --git a/drivers/gpu/drm/i915/intel_clrmgr.c
b/drivers/gpu/drm/i915/intel_clrmgr.c
index ac0a890..36c64c1 100644
--- a/drivers/gpu/drm/i915/intel_clrmgr.c
+++ b/drivers/gpu/drm/i915/intel_clrmgr.c
@@ -32,6 +32,138 @@
#include "i915_reg.h"
#include "intel_clrmgr.h"
+/*
+* Names to register with color properties.
+* Sequence must be the same as the order
+* of enum clrmgr_tweaks
+*/
+const char *clrmgr_property_names[] = {
+ /* csc */
+ "csc-correction",
+ /* add a new prop name here */
+};
+
+
+/*
+* Sizes for color properties. This can differ
+* platform by platform, hence 'vlv' prefix
+* The sequence must be same as the order of
+* enum clrmgr_tweaks
+*/
+u32 vlv_color_property_sizes[] = {
+ VLV_CSC_MATRIX_MAX_VALS,
+ /* Add new property size here */
+};
+
+/* Default CSC values to create property with */
+uint64_t vlv_csc_default[VLV_CSC_MATRIX_MAX_VALS] = {
+ 0x400, 0, 0, 0, 0x400, 0, 0, 0, 0x400
+};
+
+/*
+* vlv_set_csc
+* Valleyview specific csc correction method.
+* Programs the 6 csc registers with 3x3 correction matrix
+* values.
+* inputs:
+* - intel_crtc*
+* - color manager registered property for csc correction
+* - data: pointer to correction values to be applied
The comment isn't matching the function. data is not a pointer, it's a
single 64bit value. Also, the boolean enable isn't described in the
comment block.
Yes,Thanks for pointing out. Missed updating comments after design
change. I will fix this.
+*/
+/* Enable color space conversion on PIPE */
+bool vlv_set_csc(struct intel_crtc *intel_crtc,
+ struct drm_property *prop, uint64_t values, bool enable)
+{
+ u32 count = 0;
+ u32 c0, c1, c2;
+ u32 pipeconf, csc_reg, data_size;
+ uint64_t *blob_data;
+ uint64_t *data = NULL;
+ struct drm_device *dev = intel_crtc->base.dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct drm_property_blob *blob = intel_crtc->csc_blob;
+
+ /* Sanity */
+ if (!blob || (blob->length != VLV_CSC_MATRIX_MAX_VALS)) {
+ DRM_ERROR("Invalid/NULL CSC blob\n");
+ return false;
+ }
+ blob_data = (uint64_t *)blob->data;
+
+ /* No need of values to disable property */
+ if (!enable)
+ goto configure;
+
+ /* Enabling property needs correction values */
+ data_size = VLV_CSC_MATRIX_MAX_VALS;
+ data = kmalloc(sizeof(uint64_t) * (data_size), GFP_KERNEL);
+ if (!data) {
+ DRM_ERROR("Out of memory\n");
+ return false;
+ }
+
+ if (copy_from_user((void *)data, (const void __user *)values,
+ data_size * sizeof(uint64_t))) {
+ DRM_ERROR("Failed to copy all data\n");
+ kfree(data);
+ return false;
+ }
I don't think this should be doing a copy_from_user. It should be the
drm_property code that handles the IOCTL that does that.
The whole handling of the blob property looks suspect to me. I believe
that the DRM code currently doesn't allow blob type properties to be
set. So you should first have a patch that adds that capability to the
DRM property code. But I'm not sure that's even the right way to
handle this.
Humm. This adds another dilemma of how to do this.
I believe blob property type is the only one which suits the CSC
property, (also gamma correction, with 129 correction values)
Even if we create a set_blob, that will be again doing a
copy_from_user() only, won't it ?
I can add a patch to do a set_blob in the next patch set. Please have a
look and let me know if that's what you expect.
+
+ DRM_DEBUG_DRIVER("Setting CSC on pipe = %d\n", intel_crtc->pipe);
+ csc_reg = PIPECSC(intel_crtc->pipe);
+
+ /* Read CSC matrix, one row at a time */
+ while (count < VLV_CSC_MATRIX_MAX_VALS) {
+ c0 = data[count] & VLV_CSC_VALUE_MASK;
+ *blob_data++ = c0;
+ c1 = data[count] & VLV_CSC_VALUE_MASK;
+ *blob_data++ = c1;
+ c2 = data[count] & VLV_CSC_VALUE_MASK;
+ *blob_data++ = c2;
You aren't incrementing count after each assignment above, that means
that c0, c1, and c2 are all getting set to the same value. That doesn't
seem right.
I am sorry, this is bad. While splitting the patches, I messed here, and
looks like the unit CSC values were getting applied properly, so dint
catch this during ULT.
Thanks for pointing this out, will fix this.
+
+ /* C0 is LSB 12bits, C1 is MSB 16-27 */
+ I915_WRITE(csc_reg, (c1 << VLV_CSC_COEFF_SHIFT) | c0);
+ csc_reg += 4;
+
+ /* C2 is LSB 12 bits */
+ I915_WRITE(csc_reg, c2);
+ csc_reg += 4;
+ }
+
+configure:
+
+ /* Enable / Disable csc correction */
+ pipeconf = I915_READ(PIPECONF(intel_crtc->pipe));
+ enable ? (pipeconf |= PIPECONF_CSC_ENABLE) :
+ (pipeconf &= ~PIPECONF_CSC_ENABLE);
+ I915_WRITE(PIPECONF(intel_crtc->pipe), pipeconf);
+ POSTING_READ(PIPECONF(intel_crtc->pipe));
+ DRM_DEBUG_DRIVER("CSC successfully %s pipe %C\n",
+ enable ? "enabled" : "disabled", pipe_name(intel_crtc->pipe));
+
+ kfree(data);
+ return true;
+}
+
+bool intel_clrmgr_set_csc(struct drm_crtc *crtc,
+ struct drm_property *prop, uint64_t values)
+{
+ struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+ struct drm_device *dev = intel_crtc->base.dev;
+ bool enable;
+
+ /* First value is enable/disable control, others are data */
+ enable = *((uint64_t *)values);
+ values += (sizeof(uint64_t));
It looks like you're trying to pass in a user space pointer to some
type of csc structure. As above, I'm not sure that's the right way to
approach this. Ideally, I think we want to use the standard drm
property types or you're going to have to define a new drm property
type that could be universally used.
Actually, I need to first decide, if we need to enable / disable the
property. Once we are sure that user space wants to enable it, then I
need correction coefficients. So I decided to have first byte as
enable/disable control, and others as correction values.
I dont see any other way of doing it, while coming from drm_property
interface.
Do you think that we can create a custom/new property type for this
reason ?
+
+ if (IS_VALLEYVIEW(dev))
+ return vlv_set_csc(intel_crtc, prop, values, enable);
+
+ /* Todo: Support other gen devices */
+ DRM_ERROR("Color correction is supported only on VLV for now\n");
+ return false;
+}
+
void
intel_attach_plane_color_correction(struct intel_plane *intel_plane)
{
@@ -41,18 +173,92 @@ intel_attach_plane_color_correction(struct intel_plane
*intel_plane)
void
intel_attach_pipe_color_correction(struct intel_crtc *intel_crtc)
{
+ struct drm_device *dev = intel_crtc->base.dev;
+ struct drm_mode_object *obj = &intel_crtc->base.base;
+ struct drm_property *property = NULL;
+
DRM_DEBUG_DRIVER("\n");
+ mutex_lock(&dev->mode_config.mutex);
+
+ /* color property = csc */
+ property = dev->mode_config.csc_property;
+ if (!property) {
+ DRM_ERROR("No such property to attach\n");
+ goto release_mutex;
+ }
+
+ /* create blob for correction values */
+ intel_crtc->csc_blob = drm_property_create_blob(dev,
+ vlv_color_property_sizes[csc], (void *)vlv_csc_default);
+ if (!intel_crtc->csc_blob) {
+ DRM_ERROR("Failed to create property blob\n");
+ goto release_mutex;
+ }
+
+ /* Attach blob with property */
+ if (drm_object_property_set_value(obj, property,
+ intel_crtc->csc_blob->base.id)) {
+ DRM_ERROR("Failed to attach property blob, destroying\n");
+ drm_property_destroy_blob(dev, intel_crtc->csc_blob);
+ goto release_mutex;
+ }
+
+ DRM_DEBUG_DRIVER("Successfully attached CSC property\n");
+
+release_mutex:
+ mutex_unlock(&dev->mode_config.mutex);
}
int intel_clrmgr_create_color_properties(struct drm_device *dev)
{
+ int ret = 0;
+ struct drm_property *property;
+
DRM_DEBUG_DRIVER("\n");
- return 0;
+ mutex_lock(&dev->mode_config.mutex);
+
+ /* CSC correction color property, blob type, size 0 */
+ property = drm_property_create(dev, DRM_MODE_PROP_BLOB,
+ clrmgr_property_names[csc], 0);
+ if (!property) {
+ DRM_ERROR("Failed to create property(CSC)\n");
+ ret++;
+ } else {
+ dev->mode_config.csc_property = property;
+ DRM_DEBUG_DRIVER("Created property: CSC\n");
+ }
+
+ mutex_unlock(&dev->mode_config.mutex);
+ return ret;
}
void intel_clrmgr_destroy_color_properties(struct drm_device *dev)
{
+ struct drm_crtc *crtc;
+ struct intel_crtc *intel_crtc;
+
DRM_DEBUG_DRIVER("\n");
+
+ mutex_lock(&dev->mode_config.mutex);
+
+ /* CSC correction color property */
+ if (dev->mode_config.csc_property) {
+ drm_property_destroy(dev, dev->mode_config.csc_property);
+ dev->mode_config.csc_property = NULL;
+ DRM_DEBUG_DRIVER("Destroyed property: CSC\n");
+ }
+
+ /* Destroy property blob from each CRTC */
+ list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
+ intel_crtc = to_intel_crtc(crtc);
+ if (intel_crtc->csc_blob) {
+ drm_property_destroy_blob(dev, intel_crtc->csc_blob);
+ intel_crtc->csc_blob = NULL;
+ }
+ }
+
+ mutex_unlock(&dev->mode_config.mutex);
+ DRM_DEBUG_DRIVER("Successfully destroyed all color properties\n");
}
void intel_clrmgr_init(struct drm_device *dev)
diff --git a/drivers/gpu/drm/i915/intel_clrmgr.h
b/drivers/gpu/drm/i915/intel_clrmgr.h
index 8cff487..5725d6b 100644
--- a/drivers/gpu/drm/i915/intel_clrmgr.h
+++ b/drivers/gpu/drm/i915/intel_clrmgr.h
@@ -39,6 +39,13 @@
#define CLRMGR_PROP_NAME_MAX 128
#define CLRMGR_PROP_RANGE_MAX 0xFFFFFFFFFFFFFFFF
+/* CSC */
+ /* CSC / Wide gamut */
+#define VLV_CSC_MATRIX_MAX_VALS 9
+#define VLV_CSC_VALUE_MASK 0xFFF
+#define VLV_CSC_COEFF_SHIFT 16
+
+
/* Properties */
enum clrmgr_tweaks {
csc = 0,
@@ -50,6 +57,15 @@ enum clrmgr_tweaks {
};
/*
+* intel_clrmgr_set_csc
+* CSC correction method is different across various
+* gen devices. This wrapper function calls the respective
+* platform specific function to set CSC
+*/
+bool intel_clrmgr_set_csc(struct drm_crtc *crtc,
+ struct drm_property *prop, uint64_t data);
+
+/*
* intel_attach_plane_color_correction:
* Attach plane level color correction DRM properties to
* corresponding plane objects.
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 7ba5785..a10b9bb 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -437,6 +437,7 @@ struct intel_crtc {
int scanline_offset;
struct intel_mmio_flip mmio_flip;
+ struct drm_property_blob *csc_blob;
};
struct intel_plane_wm_parameters {
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 31344bf..487ce44 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -851,6 +851,9 @@ struct drm_mode_config {
struct drm_property *aspect_ratio_property;
struct drm_property *dirty_info_property;
+ /* Color correction properties */
+ struct drm_property *csc_property;
+
/* dumb ioctl parameters */
uint32_t preferred_depth, prefer_shadow;
@@ -981,6 +984,10 @@ extern int drm_mode_connector_set_path_property(struct
drm_connector *connector,
char *path);
extern int drm_mode_connector_update_edid_property(struct drm_connector
*connector,
struct edid *edid);
+extern struct drm_property_blob *drm_property_create_blob(struct drm_device
*dev,
+ int length, void *data);
+extern void drm_property_destroy_blob(struct drm_device *dev,
+ struct drm_property_blob *blob);
static inline bool drm_property_type_is(struct drm_property *property,
uint32_t type)
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