Re: [PATCH 1/3] drm/mediatek: Dynamically allocate CMDQ and use helper functions

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Il 03/08/23 08:28, CK Hu (胡俊光) ha scritto:
Hi, Angelo:

On Wed, 2023-08-02 at 12:41 +0200, AngeloGioacchino Del Regno wrote:
Il 02/08/23 08:24, CK Hu (胡俊光) ha scritto:
Hi, Angelo:

On Fri, 2023-06-23 at 11:49 +0200, AngeloGioacchino Del Regno
wrote:
   	
External email : Please do not click links or open attachments
until
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   Instead of stack allocating the cmdq_client and cmdq_handle
structures
switch them to pointers, allowing us to migrate this driver to
use
the
common functions provided by mtk-cmdq-helper.
In order to do this, it was also necessary to add a `priv`
pointer to
struct cmdq_client, as that's used to pass (in this case) a
mtk_crtc
handle to the ddp_cmdq_cb() mailbox RX callback function.

Signed-off-by: AngeloGioacchino Del Regno <
angelogioacchino.delregno@xxxxxxxxxxxxx>
---
   drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 107 +++++++--------
-------
--
   include/linux/soc/mediatek/mtk-cmdq.h   |   1 +
   2 files changed, 32 insertions(+), 76 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index 0df62b076f49..b63289ab6787 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
@@ -50,8 +50,8 @@ struct mtk_drm_crtc {
   	bool				pending_async_planes;
#if IS_REACHABLE(CONFIG_MTK_CMDQ)
-	struct cmdq_client		cmdq_client;
-	struct cmdq_pkt			cmdq_handle;
+	struct cmdq_client		*cmdq_client;
+	struct cmdq_pkt			*cmdq_handle;
   	u32				cmdq_event;
   	u32				cmdq_vblank_cnt;
   	wait_queue_head_t		cb_blocking_queue;
@@ -108,47 +108,6 @@ static void mtk_drm_finish_page_flip(struct
mtk_drm_crtc *mtk_crtc)
   	}
   }
-#if IS_REACHABLE(CONFIG_MTK_CMDQ)
-static int mtk_drm_cmdq_pkt_create(struct cmdq_client *client,
struct cmdq_pkt *pkt,
-				   size_t size)
-{
-	struct device *dev;
-	dma_addr_t dma_addr;
-
-	pkt->va_base = kzalloc(size, GFP_KERNEL);
-	if (!pkt->va_base) {
-		kfree(pkt);
-		return -ENOMEM;
-	}
-	pkt->buf_size = size;
-	pkt->cl = (void *)client;

I have a plan to remove cl in struct cmdq_pkt. But this
modification
would make this plan more difficult. So I would pending this patch
until cl is removed from struct cmdq_pkt.


I think that this ifdef cleanup is more urgent than the removal of
`cl` from
struct cmdq_pkt, as those ifdefs shouldn't have reached upstream in
the first
place, don't you agree?

I think removing ifdefs and using helper function are different things.
You could remove ifdefs and keep mtk_drm_cmdq_pkt_create().


I chose to do it like that because this function would otherwise be a
100% duplicate of the related cmdq helper :-)


Regards,
CK


Regards,
Angelo






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