linux-kernel - [PATCH 3/8] drm: mali-dp: Add pitch alignment check function

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Date:   Tue, 11 Oct 2016 15:26:04 +0100
From:   Brian Starkey <brian.starkey@....com>
To:     dri-devel@...ts.freedesktop.org
Cc:     linux-kernel@...r.kernel.org, liviu.dudau@....com
Subject: [PATCH 3/8] drm: mali-dp: Add pitch alignment check function

Different hardware versions have different requirements when it comes to
pitch alignment. Add a function which can be used to check pitch
alignment for a device.

Signed-off-by: Brian Starkey <brian.starkey@....com>
---
 drivers/gpu/drm/arm/malidp_hw.c |    3 +++
 drivers/gpu/drm/arm/malidp_hw.h |    9 +++++++++
 2 files changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/arm/malidp_hw.c b/drivers/gpu/drm/arm/malidp_hw.c
index a6132f1..7f4a0bd 100644
--- a/drivers/gpu/drm/arm/malidp_hw.c
+++ b/drivers/gpu/drm/arm/malidp_hw.c
@@ -441,6 +441,7 @@ const struct malidp_hw_device malidp_device[MALIDP_MAX_DEVICES] = {
 			},
 			.input_formats = malidp500_de_formats,
 			.n_input_formats = ARRAY_SIZE(malidp500_de_formats),
+			.bus_align_bytes = 8,
 		},
 		.query_hw = malidp500_query_hw,
 		.enter_config_mode = malidp500_enter_config_mode,
@@ -473,6 +474,7 @@ const struct malidp_hw_device malidp_device[MALIDP_MAX_DEVICES] = {
 			},
 			.input_formats = malidp550_de_formats,
 			.n_input_formats = ARRAY_SIZE(malidp550_de_formats),
+			.bus_align_bytes = 8,
 		},
 		.query_hw = malidp550_query_hw,
 		.enter_config_mode = malidp550_enter_config_mode,
@@ -506,6 +508,7 @@ const struct malidp_hw_device malidp_device[MALIDP_MAX_DEVICES] = {
 			},
 			.input_formats = malidp550_de_formats,
 			.n_input_formats = ARRAY_SIZE(malidp550_de_formats),
+			.bus_align_bytes = 16,
 		},
 		.query_hw = malidp650_query_hw,
 		.enter_config_mode = malidp550_enter_config_mode,
diff --git a/drivers/gpu/drm/arm/malidp_hw.h b/drivers/gpu/drm/arm/malidp_hw.h
index 141743e..087e1202 100644
--- a/drivers/gpu/drm/arm/malidp_hw.h
+++ b/drivers/gpu/drm/arm/malidp_hw.h
@@ -88,6 +88,9 @@ struct malidp_hw_regmap {
 	/* list of supported input formats for each layer */
 	const struct malidp_input_format *input_formats;
 	const u8 n_input_formats;
+
+	/* pitch alignment requirement in bytes */
+	const u8 bus_align_bytes;
 };
 
 struct malidp_hw_device {
@@ -229,6 +232,12 @@ void malidp_se_irq_fini(struct drm_device *drm);
 u8 malidp_hw_get_format_id(const struct malidp_hw_regmap *map,
 			   u8 layer_id, u32 format);
 
+static inline bool malidp_hw_pitch_valid(struct malidp_hw_device *hwdev,
+					 unsigned int pitch)
+{
+	return !(pitch & (hwdev->map.bus_align_bytes - 1));
+}
+
 /*
  * background color components are defined as 12bits values,
  * they will be shifted right when stored on hardware that
-- 
1.7.9.5