drm/i915: Clean up PIPESRC defines

Use REG_GENMASK() & co. when dealing with PIPESRC.

Note that i9xx_get_initial_plane_config() will now use the
full 16 bit mask whereas previously it used 12 bits only.
But intel_get_pipe_src_size() already used the full 16 bits
on all platforms anyway, so at least we're consistent now.
The high bits beyond the max supported pipe source size
should not be set in any case so this seems fine.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211112193813.8224-7-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/display/i9xx_plane.c

@@ -1054,8 +1054,8 @@ i9xx_get_initial_plane_config(struct intel_crtc *crtc,
 	plane_config->base = base;
 
 	val = intel_de_read(dev_priv, PIPESRC(pipe));
-	fb->width = ((val >> 16) & 0xfff) + 1;
-	fb->height = ((val >> 0) & 0xfff) + 1;
+	fb->width = REG_FIELD_GET(PIPESRC_WIDTH_MASK, val) + 1;
+	fb->height = REG_FIELD_GET(PIPESRC_HEIGHT_MASK, val) + 1;
 
 	val = intel_de_read(dev_priv, DSPSTRIDE(i9xx_plane));
 	fb->pitches[0] = val & 0xffffffc0;

drivers/gpu/drm/i915/display/intel_display.c

@@ -3276,7 +3276,8 @@ static void intel_set_pipe_src_size(const struct intel_crtc_state *crtc_state)
 	 * always be the user's requested size.
 	 */
 	intel_de_write(dev_priv, PIPESRC(pipe),
-		       ((crtc_state->pipe_src_w - 1) << 16) | (crtc_state->pipe_src_h - 1));
+		       PIPESRC_WIDTH(crtc_state->pipe_src_w - 1) |
+		       PIPESRC_HEIGHT(crtc_state->pipe_src_h - 1));
 }
 
 static bool intel_pipe_is_interlaced(const struct intel_crtc_state *crtc_state)
@@ -3347,8 +3348,8 @@ static void intel_get_pipe_src_size(struct intel_crtc *crtc,
 	u32 tmp;
 
 	tmp = intel_de_read(dev_priv, PIPESRC(crtc->pipe));
-	pipe_config->pipe_src_h = (tmp & 0xffff) + 1;
-	pipe_config->pipe_src_w = ((tmp >> 16) & 0xffff) + 1;
+	pipe_config->pipe_src_w = REG_FIELD_GET(PIPESRC_WIDTH_MASK, tmp) + 1;
+	pipe_config->pipe_src_h = REG_FIELD_GET(PIPESRC_HEIGHT_MASK, tmp) + 1;
 }
 
 static void i9xx_set_pipeconf(const struct intel_crtc_state *crtc_state)

drivers/gpu/drm/i915/i915_reg.h

@@ -3476,6 +3476,10 @@ enum {
 #define _VSYNC_A	0x60014
 #define _EXITLINE_A	0x60018
 #define _PIPEASRC	0x6001c
+#define   PIPESRC_WIDTH_MASK	REG_GENMASK(31, 16)
+#define   PIPESRC_WIDTH(w)	REG_FIELD_PREP(PIPESRC_WIDTH_MASK, (w))
+#define   PIPESRC_HEIGHT_MASK	REG_GENMASK(15, 0)
+#define   PIPESRC_HEIGHT(h)	REG_FIELD_PREP(PIPESRC_HEIGHT_MASK, (h))
 #define _BCLRPAT_A	0x60020
 #define _VSYNCSHIFT_A	0x60028
 #define _PIPE_MULT_A	0x6002c