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bdk: sdmmc: refactor comments

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This commit is contained in:
CTCaer
2023-06-09 10:36:29 +03:00
parent b674624ad0
commit d621d96af1
4 changed files with 66 additions and 49 deletions
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13
bdk/storage/sdmmc_driver.c
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@@ -344,6 +344,7 @@ int sdmmc_setup_clock(sdmmc_t *sdmmc, u32 type)
break;
case SDHCI_TIMING_MMC_HS400:
// Non standard.
sdmmc->regs->hostctl2 = (sdmmc->regs->hostctl2 & (~SDHCI_CTRL_UHS_MASK)) | HS400_BUS_SPEED;
sdmmc->regs->hostctl2 |= SDHCI_CTRL_VDD_180;
break;
@@ -723,8 +724,9 @@ static int _sdmmc_manual_tuning_set_tap(sdmmc_t *sdmmc, sdmmc_manual_tuning_t *t
}
}
// Check if failed.
if (!best_tap)
// Check if failed or window too small.
if (!best_tap || best_size < SAMPLING_WINDOW_SIZE_MIN)
return 0;
sdmmc->regs->clkcon &= ~SDHCI_CLOCK_CARD_EN;
@@ -743,9 +745,12 @@ static int _sdmmc_manual_tuning_set_tap(sdmmc_t *sdmmc, sdmmc_manual_tuning_t *t
* SD Card DDR200 (DDR208) support
*
* On Tegra X1, that can be done with DDR50 host mode.
* Tuning though can't be done automatically on any DDR mode.
* That's because HS400 4-bit or HS400 generally, is not supported on SDMMC1/3.
* And also, tuning can't be done automatically on any DDR mode.
* So it needs to be done manually and selected tap will be applied from the biggest
* sampling window.
* That allows DDR200 support on every DDR200 sd card, other than the original maker
* of DDR200, Sandisk. Since Sandisk cards mandate DLL syncing.
*/
static int sdmmc_tuning_execute_ddr200(sdmmc_t *sdmmc)
{
@@ -1041,7 +1046,7 @@ static int _sdmmc_config_sdma(sdmmc_t *sdmmc, u32 *blkcnt_out, sdmmc_req_t *req)
sdmmc->dma_addr_next = ALIGN_DOWN((admaaddr + SZ_512K), SZ_512K);
sdmmc->regs->blksize = req->blksize | (7 << 12); // SDMA DMA 512KB Boundary (Detects A18 carry out).
sdmmc->regs->blksize = req->blksize | (7u << 12); // SDMA DMA 512KB Boundary (Detects A18 carry out).
sdmmc->regs->blkcnt = blkcnt;
if (blkcnt_out)