drm/komeda: Expose bus_width to Komeda-CORE

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@arm.com>
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>

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 b01b628019ba..34506ef7ad40 100644
--- a/drivers/gpu/drm/arm/display/komeda/d71/d71_dev.c
+++ b/drivers/gpu/drm/arm/display/komeda/d71/d71_dev.c
@@ -520,6 +520,7 @@ 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 e8573b03021f..86f6542afb40 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
@@ -26,10 +26,10 @@ 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);
 }