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drm/komeda: fixing of DMA mapping sg segment warning

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Fixing the DMA mapping sg segment warning, which shows "DMA-API: mapping
sg segment longer than device claims to support [len=921600] [max=65536]".
Fixed by setting the max segment size at Komeda driver.

This patch depends on:
- https://patchwork.freedesktop.org/series/54448/
- https://patchwork.freedesktop.org/series/54449/
- https://patchwork.freedesktop.org/series/54450/
- https://patchwork.freedesktop.org/series/58976/

Changes since v1:
- Adds member description
- Adds patch denpendency in the comment

Signed-off-by: Lowry Li (Arm Technology China) <lowry.li@arm.com>
Reviewed-by: James Qian Wang (Arm Technology China) <james.qian.wang@arm.com>
Reviewed-by: Ayan Kumar Halder <ayan.halder@arm.com>
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>
This commit is contained in:
Lowry Li (Arm Technology China) 2019-04-11 09:37:13 +01:00 committed by Liviu Dudau
parent ba1b9f8c46
commit a260e0b847
2 changed files with 6 additions and 0 deletions
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4
drivers/gpu/drm/arm/display/komeda/komeda_dev.c
View File

@ -8,6 +8,7 @@
#include <linux/of_device.h> #include <linux/of_device.h>
#include <linux/of_graph.h> #include <linux/of_graph.h>
#include <linux/platform_device.h> #include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#ifdef CONFIG_DEBUG_FS #ifdef CONFIG_DEBUG_FS
#include <linux/debugfs.h> #include <linux/debugfs.h>
#include <linux/seq_file.h> #include <linux/seq_file.h>
@ -249,6 +250,9 @@ struct komeda_dev *komeda_dev_create(struct device *dev)
goto err_cleanup; goto err_cleanup;
} }
dev->dma_parms = &mdev->dma_parms;
dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
err = sysfs_create_group(&dev->kobj, &komeda_sysfs_attr_group); err = sysfs_create_group(&dev->kobj, &komeda_sysfs_attr_group);
if (err) { if (err) {
DRM_ERROR("create sysfs group failed.\n"); DRM_ERROR("create sysfs group failed.\n");

2
drivers/gpu/drm/arm/display/komeda/komeda_dev.h
View File

@ -149,6 +149,8 @@ struct komeda_dev {
struct device *dev; struct device *dev;
/** @reg_base: the base address of komeda io space */ /** @reg_base: the base address of komeda io space */
u32 __iomem *reg_base; u32 __iomem *reg_base;
/** @dma_parms: the dma parameters of komeda */
struct device_dma_parameters dma_parms;
/** @chip: the basic chip information */ /** @chip: the basic chip information */
struct komeda_chip_info chip; struct komeda_chip_info chip;