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authorLudovic Barre <ludovic.barre@st.com>2019-10-08 11:56:02 +0200
committerUlf Hansson <ulf.hansson@linaro.org>2019-11-13 16:10:16 +0100
commit8266c585f4897ceff0959bd64d196f164caa0601 (patch)
treea59e6a2e8dc7567aa437d8cbb587af0b7dfc5cb9 /drivers/mmc/host/mmci.h
parente2b98d83ff0c1aaba31c767673c8000e20ad3524 (diff)
mmc: mmci: add hardware busy timeout feature
In the stm32_sdmmc variant, the datatimer is active not only during data transfers with the DPSM, but also while waiting for the busyend IRQs from commands having the MMC_RSP_BUSY flag set. This leads to an incorrect IRQ being raised to signal MCI_DATATIMEOUT error, which simply breaks the behaviour. Address this by updating the datatimer value before sending a command having the MMC_RSP_BUSY flag set. To inform the mmc core about the maximum supported busy timeout, which also depends on the current clock rate, set ->max_busy_timeout (in ms). Signed-off-by: Ludovic Barre <ludovic.barre@st.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/host/mmci.h')
-rw-r--r--drivers/mmc/host/mmci.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h
index 833236ecb31e..d8b7f6774e8f 100644
--- a/drivers/mmc/host/mmci.h
+++ b/drivers/mmc/host/mmci.h
@@ -287,6 +287,8 @@ struct mmci_host;
* @signal_direction: input/out direction of bus signals can be indicated
* @pwrreg_clkgate: MMCIPOWER register must be used to gate the clock
* @busy_detect: true if the variant supports busy detection on DAT0.
+ * @busy_timeout: true if the variant starts data timer when the DPSM
+ * enter in Wait_R or Busy state.
* @busy_dpsm_flag: bitmask enabling busy detection in the DPSM
* @busy_detect_flag: bitmask identifying the bit in the MMCISTATUS register
* indicating that the card is busy
@@ -333,6 +335,7 @@ struct variant_data {
u8 signal_direction:1;
u8 pwrreg_clkgate:1;
u8 busy_detect:1;
+ u8 busy_timeout:1;
u32 busy_dpsm_flag;
u32 busy_detect_flag;
u32 busy_detect_mask;