[Intel-gfx] [PATCH 05/18] drm/i915/display13: Support 128k plane stride

[Lucas De Marchi]

On Thu, Jan 28, 2021 at 11:24:00AM -0800, Matt Roper wrote:
>From: Juha-Pekka Heikkilä <juha-pekka.heikkila at intel.com>
>
>Display13 supports plane strides up to 128KB.
>
>Cc: Vandita Kulkarni <vandita.kulkarni at intel.com>
>Signed-off-by: Juha-Pekka Heikkilä <juha-pekka.heikkila at intel.com>
>Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
>---
> drivers/gpu/drm/i915/display/intel_display.c |  6 ++++-
> drivers/gpu/drm/i915/display/intel_sprite.c  | 24 ++++++++++++++++++--
> drivers/gpu/drm/i915/i915_reg.h              |  2 ++
> 3 files changed, 29 insertions(+), 3 deletions(-)
>
>diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
>index d013b0fab128..f56237aaa7b5 100644
>--- a/drivers/gpu/drm/i915/display/intel_display.c
>+++ b/drivers/gpu/drm/i915/display/intel_display.c
>@@ -8396,7 +8396,11 @@ skl_get_initial_plane_config(struct intel_crtc *crtc,
>
> 	val = intel_de_read(dev_priv, PLANE_STRIDE(pipe, plane_id));
> 	stride_mult = skl_plane_stride_mult(fb, 0, DRM_MODE_ROTATE_0);
>-	fb->pitches[0] = (val & 0x3ff) * stride_mult;
>+
>+	if (HAS_DISPLAY13(dev_priv))
>+		fb->pitches[0] = (val & PLANE_STRIDE_MASK_D13) * stride_mult;
>+	else
>+		fb->pitches[0] = (val & PLANE_STRIDE_MASK) * stride_mult;
>
> 	aligned_height = intel_fb_align_height(fb, 0, fb->height);
>
>diff --git a/drivers/gpu/drm/i915/display/intel_sprite.c b/drivers/gpu/drm/i915/display/intel_sprite.c
>index 81bb5eb1cd15..c858ba6dc026 100644
>--- a/drivers/gpu/drm/i915/display/intel_sprite.c
>+++ b/drivers/gpu/drm/i915/display/intel_sprite.c
>@@ -572,17 +572,37 @@ skl_plane_max_stride(struct intel_plane *plane,
> 		     u32 pixel_format, u64 modifier,
> 		     unsigned int rotation)
> {
>+	struct drm_i915_private *i915 = to_i915(plane->base.dev);
> 	const struct drm_format_info *info = drm_format_info(pixel_format);
> 	int cpp = info->cpp[0];
>+	int max_horizontal_pixels = 8192;
>+	int max_stride_bytes;
>+
>+	if (HAS_DISPLAY13(i915)) {
>+		/*
>+		 * The stride in bytes must not exceed of the size
>+		 * of 128K bytes. For pixel formats of 64bpp will allow
>+		 * for a 16K pixel surface.
>+		 */
>+		max_stride_bytes = 131072;
>+		if (cpp == 8)
>+			max_horizontal_pixels = 16384;

missing here:

	else
		max_horizontal_pixels = 65536;


Also, we are starting to overcomplicate skl_plane_max_stride().
Time to start setting plane->max_stride based on the platform?
Although this could be done after landing this patch. With the fix
above:


Reviewed-by: Lucas De Marchi <lucas.demarchi at intel.com>

Lucas De Marchi

>+	} else {
>+		/*
>+		 * "The stride in bytes must not exceed the
>+		 * of the size of 8K pixels and 32K bytes."
>+		 */
>+		max_stride_bytes = 32768;
>+	}
>
> 	/*
> 	 * "The stride in bytes must not exceed the
> 	 * of the size of 8K pixels and 32K bytes."
> 	 */
> 	if (drm_rotation_90_or_270(rotation))
>-		return min(8192, 32768 / cpp);
>+		return min(max_horizontal_pixels, max_stride_bytes / cpp);
> 	else
>-		return min(8192 * cpp, 32768);
>+		return min(max_horizontal_pixels * cpp, max_stride_bytes);
> }
>
> static void
>diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
>index a57593f7d7b1..9dfa4d711d6f 100644
>--- a/drivers/gpu/drm/i915/i915_reg.h
>+++ b/drivers/gpu/drm/i915/i915_reg.h
>@@ -7198,6 +7198,8 @@ enum {
> 	_PIPE(pipe, _PLANE_STRIDE_3_A, _PLANE_STRIDE_3_B)
> #define PLANE_STRIDE(pipe, plane)	\
> 	_MMIO_PLANE(plane, _PLANE_STRIDE_1(pipe), _PLANE_STRIDE_2(pipe))
>+#define PLANE_STRIDE_MASK REG_GENMASK(10, 0)
>+#define PLANE_STRIDE_MASK_D13 REG_GENMASK(11, 0)
>
> #define _PLANE_POS_1_B				0x7118c
> #define _PLANE_POS_2_B				0x7128c
>-- 
>2.25.4
>
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