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authorBen Wolsieffer <Ben.Wolsieffer@hefring.com>2023-09-28 16:56:44 +0300
committerUlf Hansson <ulf.hansson@linaro.org>2023-10-10 14:35:31 +0300
commit44ac5e91580b9c88212bd0336214ac204e6e9fe7 (patch)
tree3fa2a9326ed3e91f4934dc29d8045e7ac505917c
parent09b59829715bc3c929bb300e2bd5d01e37faa3d3 (diff)
downloadlinux-44ac5e91580b9c88212bd0336214ac204e6e9fe7.tar.xz
mmc: mmci: use peripheral flow control for STM32
The STM32 SDMMC peripheral (at least for the STM32F429, STM32F469 and STM32F746, which are all the currently supported devices using periphid 0x00880180) requires DMA to be performed in peripheral flow controller mode. From the STM32F74/5 reference manual, section 35.3.2: "SDMMC host allows only to use the DMA in peripheral flow controller mode. DMA stream used to serve SDMMC must be configured in peripheral flow controller mode" This patch adds a variant option to control peripheral flow control and enables it for the STM32 variant. Signed-off-by: Ben Wolsieffer <Ben.Wolsieffer@hefring.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Link: https://lore.kernel.org/r/20230928135644.1489691-1-ben.wolsieffer@hefring.com Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
-rw-r--r--drivers/mmc/host/mmci.c3
-rw-r--r--drivers/mmc/host/mmci.h2
2 files changed, 4 insertions, 1 deletions
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index dda756a56379..e967cca7a16f 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -249,6 +249,7 @@ static struct variant_data variant_stm32 = {
.f_max = 48000000,
.pwrreg_clkgate = true,
.pwrreg_nopower = true,
+ .dma_flow_controller = true,
.init = mmci_variant_init,
};
@@ -1015,7 +1016,7 @@ static int _mmci_dmae_prep_data(struct mmci_host *host, struct mmc_data *data,
.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
.src_maxburst = variant->fifohalfsize >> 2, /* # of words */
.dst_maxburst = variant->fifohalfsize >> 2, /* # of words */
- .device_fc = false,
+ .device_fc = variant->dma_flow_controller,
};
struct dma_chan *chan;
struct dma_device *device;
diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h
index 253197f132fc..34d9897c289b 100644
--- a/drivers/mmc/host/mmci.h
+++ b/drivers/mmc/host/mmci.h
@@ -332,6 +332,7 @@ enum mmci_busy_state {
* @opendrain: bitmask identifying the OPENDRAIN bit inside MMCIPOWER register
* @dma_lli: true if variant has dma link list feature.
* @stm32_idmabsize_mask: stm32 sdmmc idma buffer size.
+ * @dma_flow_controller: use peripheral as flow controller for DMA.
*/
struct variant_data {
unsigned int clkreg;
@@ -378,6 +379,7 @@ struct variant_data {
u8 dma_lli:1;
u32 stm32_idmabsize_mask;
u32 stm32_idmabsize_align;
+ bool dma_flow_controller;
void (*init)(struct mmci_host *host);
};