[PATCH 1/5] mmc: sdhci: Tidy reading 136-bit responses
From: Kishon Vijay Abraham I <hidden>
Date: 2017-08-21 07:42:28
Also in:
linux-devicetree, linux-mmc, linux-omap, lkml
Subsystem:
multimedia card (mmc), secure digital (sd) and sdio subsystem, secure digital host controller interface (sdhci) driver, the rest · Maintainers:
Ulf Hansson, Adrian Hunter, Linus Torvalds
From: Adrian Hunter <adrian.hunter@intel.com> Read each register only once and move the code to a separate function so that it is not jammed against the 80 column margin. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Kishon Vijay Abraham I <redacted> --- drivers/mmc/host/sdhci.c | 28 ++++++++++++++++++---------- 1 file changed, 18 insertions(+), 10 deletions(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index a1ad2ddadca1..ba639b7851cb 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c@@ -1173,24 +1173,32 @@ void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd) } EXPORT_SYMBOL_GPL(sdhci_send_command); +static void sdhci_read_rsp_136(struct sdhci_host *host, struct mmc_command *cmd) +{ + int i, reg; + + for (i = 0; i < 4; i++) { + reg = SDHCI_RESPONSE + (3 - i) * 4; + cmd->resp[i] = sdhci_readl(host, reg); + } + + /* CRC is stripped so we need to do some shifting */ + for (i = 0; i < 4; i++) { + cmd->resp[i] <<= 8; + if (i != 3) + cmd->resp[i] |= cmd->resp[i + 1] >> 24; + } +} + static void sdhci_finish_command(struct sdhci_host *host) { struct mmc_command *cmd = host->cmd; - int i; host->cmd = NULL; if (cmd->flags & MMC_RSP_PRESENT) { if (cmd->flags & MMC_RSP_136) { - /* CRC is stripped so we need to do some shifting. */ - for (i = 0;i < 4;i++) { - cmd->resp[i] = sdhci_readl(host, - SDHCI_RESPONSE + (3-i)*4) << 8; - if (i != 3) - cmd->resp[i] |= - sdhci_readb(host, - SDHCI_RESPONSE + (3-i)*4-1); - } + sdhci_read_rsp_136(host, cmd); } else { cmd->resp[0] = sdhci_readl(host, SDHCI_RESPONSE); }
--
2.11.0