[U-Boot] [PATCH] blk: Remove various places that do flush cache after read

[Bin Meng]

All these places seem to inherit the codes from the MMC driver where
a FIXME was put in the comment. However the correct operation after
read should be cache invalidate, not flush.

The underlying drivers should be responsible for the cache operation.
Remove these codes completely.

Signed-off-by: Bin Meng <bmeng.cn at gmail.com>
---

 arch/arm/cpu/armv8/fsl-layerscape/ppa.c | 15 ---------------
 board/toradex/common/tdx-cfg-block.c    |  2 --
 cmd/mmc.c                               |  2 --
 drivers/block/blk-uclass.c              |  3 ---
 drivers/block/blk_legacy.c              |  3 ---
 drivers/net/fm/fm.c                     |  2 --
 drivers/net/phy/cortina.c               |  2 --
 drivers/qe/qe.c                         |  2 --
 8 files changed, 31 deletions(-)

diff --git a/arch/arm/cpu/armv8/fsl-layerscape/ppa.c b/arch/arm/cpu/armv8/fsl-layerscape/ppa.c
index 24ddb5d..bbf8bba 100644
--- a/arch/arm/cpu/armv8/fsl-layerscape/ppa.c
+++ b/arch/arm/cpu/armv8/fsl-layerscape/ppa.c
@@ -107,9 +107,6 @@ int ppa_init(void)
 		return -EIO;
 	}
 
-	/* flush cache after read */
-	flush_cache((ulong)fitp, cnt * 512);
-
 	ret = fdt_check_header(fitp);
 	if (ret) {
 		free(fitp);
@@ -134,9 +131,6 @@ int ppa_init(void)
 	}
 	debug("Read PPA header to 0x%p\n", ppa_hdr_ddr);
 
-	/* flush cache after read */
-	flush_cache((ulong)ppa_hdr_ddr, cnt * 512);
-
 	ppa_esbc_hdr = (uintptr_t)ppa_hdr_ddr;
 #endif
 
@@ -164,9 +158,6 @@ int ppa_init(void)
 		return -EIO;
 	}
 
-	/* flush cache after read */
-	flush_cache((ulong)ppa_fit_addr, cnt * 512);
-
 #elif defined(CONFIG_SYS_LS_PPA_FW_IN_NAND)
 	struct fdt_header fit;
 
@@ -208,9 +199,6 @@ int ppa_init(void)
 	}
 	debug("Read PPA header to 0x%p\n", ppa_hdr_ddr);
 
-	/* flush cache after read */
-	flush_cache((ulong)ppa_hdr_ddr, fw_length);
-
 	ppa_esbc_hdr = (uintptr_t)ppa_hdr_ddr;
 #endif
 
@@ -232,9 +220,6 @@ int ppa_init(void)
 		       CONFIG_SYS_LS_PPA_FW_ADDR);
 		return -EIO;
 	}
-
-	/* flush cache after read */
-	flush_cache((ulong)ppa_fit_addr, fw_length);
 #else
 #error "No CONFIG_SYS_LS_PPA_FW_IN_xxx defined"
 #endif
diff --git a/board/toradex/common/tdx-cfg-block.c b/board/toradex/common/tdx-cfg-block.c
index 328c4c0..f850a3c 100644
--- a/board/toradex/common/tdx-cfg-block.c
+++ b/board/toradex/common/tdx-cfg-block.c
@@ -129,8 +129,6 @@ static int tdx_cfg_block_mmc_storage(u8 *config_block, int write)
 			ret = -EIO;
 			goto out;
 		}
-		/* Flush cache after read */
-		flush_cache((ulong)(unsigned char *)config_block, 512);
 	} else {
 		/* Just writing one 512 byte block */
 		if (blk_dwrite(mmc_get_blk_desc(mmc), blk_start, 1,
diff --git a/cmd/mmc.c b/cmd/mmc.c
index 00697fc..5def4ea 100644
--- a/cmd/mmc.c
+++ b/cmd/mmc.c
@@ -293,8 +293,6 @@ static int do_mmc_read(cmd_tbl_t *cmdtp, int flag,
 	       curr_device, blk, cnt);
 
 	n = blk_dread(mmc_get_blk_desc(mmc), blk, cnt, addr);
-	/* flush cache after read */
-	flush_cache((ulong)addr, cnt * 512); /* FIXME */
 	printf("%d blocks read: %s\n", n, (n == cnt) ? "OK" : "ERROR");
 
 	return (n == cnt) ? CMD_RET_SUCCESS : CMD_RET_FAILURE;
diff --git a/drivers/block/blk-uclass.c b/drivers/block/blk-uclass.c
index 3aec569..e5f00dc 100644
--- a/drivers/block/blk-uclass.c
+++ b/drivers/block/blk-uclass.c
@@ -294,9 +294,6 @@ ulong blk_read_devnum(enum if_type if_type, int devnum, lbaint_t start,
 	if (IS_ERR_VALUE(n))
 		return n;
 
-	/* flush cache after read */
-	flush_cache((ulong)buffer, blkcnt * desc->blksz);
-
 	return n;
 }
 
diff --git a/drivers/block/blk_legacy.c b/drivers/block/blk_legacy.c
index 981872e..16d3bfe 100644
--- a/drivers/block/blk_legacy.c
+++ b/drivers/block/blk_legacy.c
@@ -232,9 +232,6 @@ ulong blk_read_devnum(enum if_type if_type, int devnum, lbaint_t start,
 	if (IS_ERR_VALUE(n))
 		return n;
 
-	/* flush cache after read */
-	flush_cache((ulong)buffer, blkcnt * desc->blksz);
-
 	return n;
 }
 
diff --git a/drivers/net/fm/fm.c b/drivers/net/fm/fm.c
index 451dfde..261f1b9 100644
--- a/drivers/net/fm/fm.c
+++ b/drivers/net/fm/fm.c
@@ -405,8 +405,6 @@ int fm_init_common(int index, struct ccsr_fman *reg)
 		mmc_init(mmc);
 		(void)mmc->block_dev.block_read(&mmc->block_dev, blk, cnt,
 						addr);
-		/* flush cache after read */
-		flush_cache((ulong)addr, cnt * 512);
 	}
 #elif defined(CONFIG_SYS_QE_FMAN_FW_IN_REMOTE)
 	void *addr = (void *)CONFIG_SYS_FMAN_FW_ADDR;
diff --git a/drivers/net/phy/cortina.c b/drivers/net/phy/cortina.c
index e0e9ed9..637d89a 100644
--- a/drivers/net/phy/cortina.c
+++ b/drivers/net/phy/cortina.c
@@ -177,8 +177,6 @@ void cs4340_upload_firmware(struct phy_device *phydev)
 		mmc_init(mmc);
 		(void)mmc->block_dev.block_read(&mmc->block_dev, blk, cnt,
 						addr);
-		/* flush cache after read */
-		flush_cache((ulong)addr, cnt * 512);
 	}
 #endif
 
diff --git a/drivers/qe/qe.c b/drivers/qe/qe.c
index 24e764d..931c9d9 100644
--- a/drivers/qe/qe.c
+++ b/drivers/qe/qe.c
@@ -221,8 +221,6 @@ void u_qe_init(void)
 		mmc_init(mmc);
 		(void)mmc->block_dev.block_read(&mmc->block_dev, blk, cnt,
 						addr);
-		/* flush cache after read */
-		flush_cache((ulong)addr, cnt * 512);
 	}
 #endif
 	u_qe_upload_firmware(addr);
-- 
2.9.2