linux-kernel - [PATCH v2 11/11] drm/komeda: Expose bus

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Message-ID: <20190122110932.5138-12-james.qian.wang@arm.com>
Date:   Tue, 22 Jan 2019 11:12:02 +0000
From:   "james qian wang (Arm Technology China)" <james.qian.wang@....com>
To:     Liviu Dudau <Liviu.Dudau@....com>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        Brian Starkey <Brian.Starkey@....com>
CC:     "Jonathan Chai (Arm Technology China)" <Jonathan.Chai@....com>,
        "Julien Yin (Arm Technology China)" <Julien.Yin@....com>,
        "thomas Sun (Arm Technology China)" <thomas.Sun@....com>,
        "Lowry Li (Arm Technology China)" <Lowry.Li@....com>,
        Ayan Halder <Ayan.Halder@....com>,
        "Tiannan Zhu (Arm Technology China)" <Tiannan.Zhu@....com>,
        "Jin Gao (Arm Technology China)" <Jin.Gao@....com>,
        "Yiqi Kang (Arm Technology China)" <Yiqi.Kang@....com>,
        nd <nd@....com>, "malidp@...s.arm.com" <malidp@...s.arm.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "james qian wang (Arm Technology China)" <james.qian.wang@....com>
Subject: [PATCH v2 11/11] drm/komeda: Expose bus_width to Komeda-CORE

From: "james qian wang (Arm Technology China)" <james.qian.wang@....com>

CHIP set bus_width according to the HW configuration, and CORE will use
it as buffer alignment.

v2: Rebase

Signed-off-by: James Qian Wang (Arm Technology China) <james.qian.wang@....com>
---
 drivers/gpu/drm/arm/display/komeda/d71/d71_dev.c | 1 +
 drivers/gpu/drm/arm/display/komeda/komeda_kms.c  | 6 +++---
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/arm/display/komeda/d71/d71_dev.c b/drivers/gpu/drm/arm/display/komeda/d71/d71_dev.c
index f517ab0ceae9..a6ca3ff16fef 100644
--- a/drivers/gpu/drm/arm/display/komeda/d71/d71_dev.c
+++ b/drivers/gpu/drm/arm/display/komeda/d71/d71_dev.c
@@ -518,6 +518,7 @@ d71_identify(u32 __iomem *reg_base, struct komeda_chip_info *chip)
 	chip->arch_id	= malidp_read32(reg_base, GLB_ARCH_ID);
 	chip->core_id	= malidp_read32(reg_base, GLB_CORE_ID);
 	chip->core_info	= malidp_read32(reg_base, GLB_CORE_INFO);
+	chip->bus_width	= D71_BUS_WIDTH_16_BYTES;
 
 	return &d71_chip_funcs;
 }
diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
index 337e6fddead0..ed54beaee2f9 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
@@ -21,10 +21,10 @@ static int komeda_gem_cma_dumb_create(struct drm_file *file,
 				      struct drm_device *dev,
 				      struct drm_mode_create_dumb *args)
 {
-	u32 alignment = 16; /* TODO get alignment from dev */
+	struct komeda_dev *mdev = dev->dev_private;
+	u32 pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
 
-	args->pitch = ALIGN(DIV_ROUND_UP(args->width * args->bpp, 8),
-			    alignment);
+	args->pitch = ALIGN(pitch, mdev->chip.bus_width);
 
 	return drm_gem_cma_dumb_create_internal(file, dev, args);
 }
-- 
2.17.1