[PATCH 05/18] mmc: meson-gx: eliminate struct sd_emmc_data

[Kevin Hilman]

Heiner Kallweit <hkallweit1 at gmail.com> writes:

> Struct sd_emmc_data is used in meson_mmc_start_cmd only, so we can get
> rid of this struct and replace the two used members with local variables.
>
> Signed-off-by: Heiner Kallweit <hkallweit1 at gmail.com>

For the same reasons as the previous patch, I don't like this change as
I think it will be much cleaner code if we keep this descriptor struct
and use it to fill out multiple descriptors in a chain.

Kevin

> ---
>  drivers/mmc/host/meson-gx-mmc.c | 69 +++++++++++++++++------------------------
>  1 file changed, 29 insertions(+), 40 deletions(-)
>
> diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
> index 630e0590..c7bf0e12 100644
> --- a/drivers/mmc/host/meson-gx-mmc.c
> +++ b/drivers/mmc/host/meson-gx-mmc.c
> @@ -146,12 +146,6 @@ struct meson_host {
>  	bool vqmmc_enabled;
>  };
>  
> -struct sd_emmc_desc {
> -	u32 cmd_cfg;
> -	u32 cmd_arg;
> -	u32 cmd_data;
> -	u32 cmd_resp;
> -};
>  #define CMD_CFG_LENGTH_SHIFT 0
>  #define CMD_CFG_LENGTH_MASK 0x1ff
>  #define CMD_CFG_BLOCK_MODE BIT(9)
> @@ -443,45 +437,41 @@ static int meson_mmc_request_done(struct mmc_host *mmc, struct mmc_request *mrq)
>  static void meson_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd)
>  {
>  	struct meson_host *host = mmc_priv(mmc);
> -	struct sd_emmc_desc *desc, desc_tmp;
> -	u32 cfg;
> +	u32 cfg, cmd_cfg = 0, cmd_data = 0;
>  	u8 blk_len, cmd_cfg_timeout;
>  	unsigned int xfer_bytes = 0;
>  
>  	/* Setup descriptors */
>  	dma_rmb();
> -	desc = &desc_tmp;
> -	memset(desc, 0, sizeof(struct sd_emmc_desc));
>  
> -	desc->cmd_cfg |= (cmd->opcode & CMD_CFG_CMD_INDEX_MASK)	<<
> -		CMD_CFG_CMD_INDEX_SHIFT;
> -	desc->cmd_cfg |= CMD_CFG_OWNER;  /* owned by CPU */
> +	cmd_cfg |= (cmd->opcode & CMD_CFG_CMD_INDEX_MASK) <<
> +		   CMD_CFG_CMD_INDEX_SHIFT;
> +	cmd_cfg |= CMD_CFG_OWNER;  /* owned by CPU */
>  
>  	/* Response */
>  	if (cmd->flags & MMC_RSP_PRESENT) {
> -		desc->cmd_cfg &= ~CMD_CFG_NO_RESP;
> +		cmd_cfg &= ~CMD_CFG_NO_RESP;
>  		if (cmd->flags & MMC_RSP_136)
> -			desc->cmd_cfg |= CMD_CFG_RESP_128;
> -		desc->cmd_cfg |= CMD_CFG_RESP_NUM;
> +			cmd_cfg |= CMD_CFG_RESP_128;
> +		cmd_cfg |= CMD_CFG_RESP_NUM;
>  		writel(0, host->regs + SD_EMMC_CMD_RSP);
>  
>  		if (!(cmd->flags & MMC_RSP_CRC))
> -			desc->cmd_cfg |= CMD_CFG_RESP_NOCRC;
> +			cmd_cfg |= CMD_CFG_RESP_NOCRC;
>  
>  		if (cmd->flags & MMC_RSP_BUSY)
> -			desc->cmd_cfg |= CMD_CFG_R1B;
> +			cmd_cfg |= CMD_CFG_R1B;
>  	} else {
> -		desc->cmd_cfg |= CMD_CFG_NO_RESP;
> +		cmd_cfg |= CMD_CFG_NO_RESP;
>  	}
>  
>  	/* data? */
>  	if (cmd->data) {
> -		desc->cmd_cfg |= CMD_CFG_DATA_IO;
> +		cmd_cfg |= CMD_CFG_DATA_IO;
>  		if (cmd->data->blocks > 1) {
> -			desc->cmd_cfg |= CMD_CFG_BLOCK_MODE;
> -			desc->cmd_cfg |=
> -				(cmd->data->blocks & CMD_CFG_LENGTH_MASK) <<
> -				CMD_CFG_LENGTH_SHIFT;
> +			cmd_cfg |= CMD_CFG_BLOCK_MODE;
> +			cmd_cfg |= (cmd->data->blocks & CMD_CFG_LENGTH_MASK) <<
> +				   CMD_CFG_LENGTH_SHIFT;
>  
>  			/* check if block-size matches, if not update */
>  			cfg = readl(host->regs + SD_EMMC_CFG);
> @@ -497,48 +487,47 @@ static void meson_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd)
>  				writel(cfg, host->regs + SD_EMMC_CFG);
>  			}
>  		} else {
> -			desc->cmd_cfg &= ~CMD_CFG_BLOCK_MODE;
> -			desc->cmd_cfg |=
> -				(cmd->data->blksz & CMD_CFG_LENGTH_MASK) <<
> -				CMD_CFG_LENGTH_SHIFT;
> +			cmd_cfg &= ~CMD_CFG_BLOCK_MODE;
> +			cmd_cfg |= (cmd->data->blksz & CMD_CFG_LENGTH_MASK) <<
> +				   CMD_CFG_LENGTH_SHIFT;
>  		}
>  
>  		cmd->data->bytes_xfered = 0;
>  		xfer_bytes = cmd->data->blksz * cmd->data->blocks;
>  		if (cmd->data->flags & MMC_DATA_WRITE) {
> -			desc->cmd_cfg |= CMD_CFG_DATA_WR;
> +			cmd_cfg |= CMD_CFG_DATA_WR;
>  			WARN_ON(xfer_bytes > host->bounce_buf_size);
>  			sg_copy_to_buffer(cmd->data->sg, cmd->data->sg_len,
>  					  host->bounce_buf, xfer_bytes);
>  			cmd->data->bytes_xfered = xfer_bytes;
>  			dma_wmb();
>  		} else {
> -			desc->cmd_cfg &= ~CMD_CFG_DATA_WR;
> +			cmd_cfg &= ~CMD_CFG_DATA_WR;
>  		}
>  
>  		if (xfer_bytes > 0) {
> -			desc->cmd_cfg &= ~CMD_CFG_DATA_NUM;
> -			desc->cmd_data = host->bounce_dma_addr & CMD_DATA_MASK;
> +			cmd_cfg &= ~CMD_CFG_DATA_NUM;
> +			cmd_data = host->bounce_dma_addr & CMD_DATA_MASK;
>  		} else {
>  			/* write data to data_addr */
> -			desc->cmd_cfg |= CMD_CFG_DATA_NUM;
> -			desc->cmd_data = 0;
> +			cmd_cfg |= CMD_CFG_DATA_NUM;
> +			cmd_data = 0;
>  		}
>  
>  		cmd_cfg_timeout = 12;
>  	} else {
> -		desc->cmd_cfg &= ~CMD_CFG_DATA_IO;
> +		cmd_cfg &= ~CMD_CFG_DATA_IO;
>  		cmd_cfg_timeout = 10;
>  	}
> -	desc->cmd_cfg |= (cmd_cfg_timeout & CMD_CFG_TIMEOUT_MASK) <<
> -		CMD_CFG_TIMEOUT_SHIFT;
> +	cmd_cfg |= (cmd_cfg_timeout & CMD_CFG_TIMEOUT_MASK) <<
> +		   CMD_CFG_TIMEOUT_SHIFT;
>  
>  	host->cmd = cmd;
>  
>  	/* Last descriptor */
> -	desc->cmd_cfg |= CMD_CFG_END_OF_CHAIN;
> -	writel(desc->cmd_cfg, host->regs + SD_EMMC_CMD_CFG);
> -	writel(desc->cmd_data, host->regs + SD_EMMC_CMD_DAT);
> +	cmd_cfg |= CMD_CFG_END_OF_CHAIN;
> +	writel(cmd_cfg, host->regs + SD_EMMC_CMD_CFG);
> +	writel(cmd_data, host->regs + SD_EMMC_CMD_DAT);
>  	wmb(); /* ensure descriptor is written before kicked */
>  	writel(cmd->arg, host->regs + SD_EMMC_CMD_ARG);
>  }