[PATCH v3 1/1] drm/i915: Enabling 128x128 and 256x256 ARGB Cursor Support

[sagar.a.kamble@intel.com]

From: Sagar Kamble <sagar.a.kamble@intel.com>

With this patch we allow larger cursor planes of sizes 128x128
and 256x256.

v2: Added more precise check on size while setting cursor plane.

v3: Changes related to restructuring cursor size restrictions
and DRM_DEBUG usage.

Testcase: igt/kms_cursor_crc
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: David Airlie <airlied@linux.ie>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: G, Pallavi <pallavi.g@intel.com>
Signed-off-by: Sagar Kamble <sagar.a.kamble@intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h      |  4 ++++
 drivers/gpu/drm/i915/intel_display.c | 36 +++++++++++++++++++++++++++++++-----
 2 files changed, 35 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 146609a..aee8258 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -3551,7 +3551,11 @@ enum punit_power_well {
 /* New style CUR*CNTR flags */
 #define   CURSOR_MODE		0x27
 #define   CURSOR_MODE_DISABLE   0x00
+#define   CURSOR_MODE_128_32B_AX 0x02
+#define   CURSOR_MODE_256_32B_AX 0x03
 #define   CURSOR_MODE_64_32B_AX 0x07
+#define   CURSOR_MODE_128_ARGB_AX ((1 << 5) | CURSOR_MODE_128_32B_AX)
+#define   CURSOR_MODE_256_ARGB_AX ((1 << 5) | CURSOR_MODE_256_32B_AX)
 #define   CURSOR_MODE_64_ARGB_AX ((1 << 5) | CURSOR_MODE_64_32B_AX)
 #define   MCURSOR_PIPE_SELECT	(1 << 28)
 #define   MCURSOR_PIPE_A	0x00
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 0868afb..e59e8fd 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -7440,10 +7440,22 @@ static void i9xx_update_cursor(struct drm_crtc *crtc, u32 base)
 	bool visible = base != 0;
 
 	if (intel_crtc->cursor_visible != visible) {
+		int16_t width = intel_crtc->cursor_width;
 		uint32_t cntl = I915_READ(CURCNTR(pipe));
 		if (base) {
 			cntl &= ~(CURSOR_MODE | MCURSOR_PIPE_SELECT);
-			cntl |= CURSOR_MODE_64_ARGB_AX | MCURSOR_GAMMA_ENABLE;
+
+			switch (width) {
+				case 64:
+					cntl |= CURSOR_MODE_64_ARGB_AX | MCURSOR_GAMMA_ENABLE;
+					break;
+				case 128:
+					cntl |= CURSOR_MODE_128_ARGB_AX | MCURSOR_GAMMA_ENABLE;
+					break;
+				case 256:
+					cntl |= CURSOR_MODE_256_ARGB_AX | MCURSOR_GAMMA_ENABLE;
+					break;
+			}
 			cntl |= pipe << 28; /* Connect to correct pipe */
 		} else {
 			cntl &= ~(CURSOR_MODE | MCURSOR_GAMMA_ENABLE);
@@ -7468,10 +7480,22 @@ static void ivb_update_cursor(struct drm_crtc *crtc, u32 base)
 	bool visible = base != 0;
 
 	if (intel_crtc->cursor_visible != visible) {
+		int16_t width = intel_crtc->cursor_width;
 		uint32_t cntl = I915_READ(CURCNTR_IVB(pipe));
 		if (base) {
 			cntl &= ~CURSOR_MODE;
-			cntl |= CURSOR_MODE_64_ARGB_AX | MCURSOR_GAMMA_ENABLE;
+
+			switch (width) {
+				case 64:
+					cntl |= CURSOR_MODE_64_ARGB_AX | MCURSOR_GAMMA_ENABLE;
+					break;
+				case 128:
+					cntl |= CURSOR_MODE_128_ARGB_AX | MCURSOR_GAMMA_ENABLE;
+					break;
+				case 256:
+					cntl |= CURSOR_MODE_256_ARGB_AX | MCURSOR_GAMMA_ENABLE;
+					break;
+			}
 		} else {
 			cntl &= ~(CURSOR_MODE | MCURSOR_GAMMA_ENABLE);
 			cntl |= CURSOR_MODE_DISABLE;
@@ -7567,9 +7591,11 @@ static int intel_crtc_cursor_set(struct drm_crtc *crtc,
 		goto finish;
 	}
 
-	/* Currently we only support 64x64 cursors */
-	if (width != 64 || height != 64) {
-		DRM_ERROR("we currently only support 64x64 cursors\n");
+	/* Check for which cursor types we support */
+	if (!((width == 64 && height == 64) ||
+			(width == 128 && height == 128 && !IS_GEN2(dev)) ||
+			(width == 256 && height == 256 && !IS_GEN2(dev)))) {
+		DRM_DEBUG("Cursor dimension not supported\n");
 		return -EINVAL;
 	}
 
-- 
1.8.5