mmc: block: fix the data timeout issue with ACMD22

If multi block write operation fails for SD card, during
error handling we send the SD_APP_SEND_NUM_WR_BLKS (ACMD22)
to know how many blocks were already programmed by card.

But mmc_sd_num_wr_blocks() function which sends the ACMD22
calculates the data timeout value from csd.tacc_ns and
csd.tacc_clks parameters which will be 0 for block addressed
(>2GB cards) SD card. This would result in timeout_ns and
timeout_clks being 0 in the mmc_request passed to host driver.
This means host controller would program its data timeout timer
value with 0 which could result in DATA TIMEOUT errors from
controller.

To fix this issue, mmc_sd_num_wr_blocks() should instead
just call the mmc_set_data_timeout() to calculate the
data timeout value. mmc_set_data_timeout() function
ensures that non zero timeout value is set even for
block addressed SD cards.

Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Reviewed-by: Venkatraman S <svenkatr@ti.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index dd2d374dcc7aa43363a5366350f79c6a17e81a70..276d21ce6bc1ba6a18c844258331d6417f6278d7 100644 (file)
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -554,7 +554,6 @@ static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
        struct mmc_request mrq = {NULL};
        struct mmc_command cmd = {0};
        struct mmc_data data = {0};
-       unsigned int timeout_us;
 
        struct scatterlist sg;
 
@@ -574,23 +573,12 @@ static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
        cmd.arg = 0;
        cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 
-       data.timeout_ns = card->csd.tacc_ns * 100;
-       data.timeout_clks = card->csd.tacc_clks * 100;
-
-       timeout_us = data.timeout_ns / 1000;
-       timeout_us += data.timeout_clks * 1000 /
-               (card->host->ios.clock / 1000);
-
-       if (timeout_us > 100000) {
-               data.timeout_ns = 100000000;
-               data.timeout_clks = 0;
-       }
-
        data.blksz = 4;
        data.blocks = 1;
        data.flags = MMC_DATA_READ;
        data.sg = &sg;
        data.sg_len = 1;
+       mmc_set_data_timeout(&data, card);
 
        mrq.cmd = &cmd;
        mrq.data = &data;