lkml.org 
[lkml]   [2020]   [Apr]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[RFC PATCH v2 4/7] mmc: host: sdhci: Factor out the command configuration
Date
Move the SD command configuration into one separate function to simplify
the sdhci_send_command(). Moreover this function can be used to support
ADMA3 transfer mode in following patches.

Signed-off-by: Baolin Wang <baolin.wang7@gmail.com>
---
drivers/mmc/host/sdhci.c | 69 +++++++++++++++++++++++-----------------
1 file changed, 39 insertions(+), 30 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index afea8393c71f..3d4cdf0e0535 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1579,9 +1579,45 @@ static void sdhci_finish_data(struct sdhci_host *host)
__sdhci_finish_data(host, false);
}

-static bool sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
+static int sdhci_get_command(struct sdhci_host *host, struct mmc_command *cmd)
{
int flags;
+
+ if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
+ WARN_ONCE(1, "Unsupported response type!\n");
+ /*
+ * This does not happen in practice because 136-bit response
+ * commands never have busy waiting, so rather than complicate
+ * the error path, just remove busy waiting and continue.
+ */
+ cmd->flags &= ~MMC_RSP_BUSY;
+ }
+
+ if (!(cmd->flags & MMC_RSP_PRESENT))
+ flags = SDHCI_CMD_RESP_NONE;
+ else if (cmd->flags & MMC_RSP_136)
+ flags = SDHCI_CMD_RESP_LONG;
+ else if (cmd->flags & MMC_RSP_BUSY)
+ flags = SDHCI_CMD_RESP_SHORT_BUSY;
+ else
+ flags = SDHCI_CMD_RESP_SHORT;
+
+ if (cmd->flags & MMC_RSP_CRC)
+ flags |= SDHCI_CMD_CRC;
+ if (cmd->flags & MMC_RSP_OPCODE)
+ flags |= SDHCI_CMD_INDEX;
+
+ /* CMD19 is special in that the Data Present Select should be set */
+ if (cmd->data || cmd->opcode == MMC_SEND_TUNING_BLOCK ||
+ cmd->opcode == MMC_SEND_TUNING_BLOCK_HS200)
+ flags |= SDHCI_CMD_DATA;
+
+ return SDHCI_MAKE_CMD(cmd->opcode, flags);
+}
+
+static bool sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
+{
+ int command;
u32 mask;
unsigned long timeout;

@@ -1625,34 +1661,7 @@ static bool sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)

sdhci_set_transfer_mode(host, cmd);

- if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
- WARN_ONCE(1, "Unsupported response type!\n");
- /*
- * This does not happen in practice because 136-bit response
- * commands never have busy waiting, so rather than complicate
- * the error path, just remove busy waiting and continue.
- */
- cmd->flags &= ~MMC_RSP_BUSY;
- }
-
- if (!(cmd->flags & MMC_RSP_PRESENT))
- flags = SDHCI_CMD_RESP_NONE;
- else if (cmd->flags & MMC_RSP_136)
- flags = SDHCI_CMD_RESP_LONG;
- else if (cmd->flags & MMC_RSP_BUSY)
- flags = SDHCI_CMD_RESP_SHORT_BUSY;
- else
- flags = SDHCI_CMD_RESP_SHORT;
-
- if (cmd->flags & MMC_RSP_CRC)
- flags |= SDHCI_CMD_CRC;
- if (cmd->flags & MMC_RSP_OPCODE)
- flags |= SDHCI_CMD_INDEX;
-
- /* CMD19 is special in that the Data Present Select should be set */
- if (cmd->data || cmd->opcode == MMC_SEND_TUNING_BLOCK ||
- cmd->opcode == MMC_SEND_TUNING_BLOCK_HS200)
- flags |= SDHCI_CMD_DATA;
+ command = sdhci_get_command(host, cmd);

timeout = jiffies;
if (host->data_timeout)
@@ -1666,7 +1675,7 @@ static bool sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
if (host->use_external_dma)
sdhci_external_dma_pre_transfer(host, cmd);

- sdhci_writew(host, SDHCI_MAKE_CMD(cmd->opcode, flags), SDHCI_COMMAND);
+ sdhci_writew(host, command, SDHCI_COMMAND);

return true;
}
--
2.17.1
\
 
 \ /
  Last update: 2020-04-26 11:40    [W:0.127 / U:1.108 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site